Del Mar Photonics - Newsletter Fall 2010 - Newsletter Winter 2010

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Nd:YAG lasers and systems
Information about laser systems with Nd:YAG laseres.
Pulsed Nd:YAG laser, Model LQ529 in its base variant can be supplied with build in second, third or fourth harmonic
generators and with external fifth harmonic generator.
Pulsed Nd:YAG laser, Model LQ829 or LQ929 in its base variant can be supplied with build in second harmonic
generator and external third or fourth harmonic generators and with external fifth harmonic generator.

Request a quote

IR viewers for Nd:YAG lasers

Near IR viewers
High performance infrared monocular viewers are designed to observe radiation emitted by infrared sources. They can be used to observe indirect radiation of IR LED's and diode lasers, Nd:YAG, Ti:Sapphire, Cr:Forsterite, dye lasers and other laser sources. IR viewers are ideal for applications involving the alignment of infrared laser beams and of optical components in near-infrared systems. Near IR viewers sensitive to laser radiation up to 2000 nm.
The light weight, compact monocular may be used as a hand-held or facemask mounted for hands free operation.

Ultraviolet viewers are designed to observe radiation emitted by UV sources.


Product news and updates - Training Workshops - Featured Customer - Other News

Del Mar Photonics is your one stop source for ultrafast (femtosecond) as well as continuum wave (CW) narrow linewidth Ti:Sapphire lasers Trestles LH Ti:Sapphire laser
Trestles LH is a new series of high quality femtosecond Ti:Sapphire lasers for applications in scientific research, biological imaging, life sciences and precision material processing. Trestles LH includes integrated sealed, turn-key, cost-effective, diode-pumped solid-state (DPSS). Trestles LH lasers offer the most attractive pricing on the market combined with excellent performance and reliability. DPSS LH is a state-of-the-art laser designed for today抯 applications. It combines superb performance and tremendous value for today抯 market and has numerous advantages over all other DPSS lasers suitable for Ti:Sapphire pumping. Trestles LH can be customized to fit customer requirements and budget.

Reserve a spot in our Femtosecond lasers training workshop in San Diego, California. Come to learn how to build a femtosecond laser from a kit
 

DPSS DMPLH lasers
DPSS DMP LH series lasers will pump your Ti:Sapphire laser. There are LH series lasers installed all over the world pumping all makes & models of oscillator. Anywhere from CEP-stabilized femtosecond Ti:Sapphire oscillators to ultra-narrow-linewidth CW Ti:Sapphire oscillators. With up to 10 Watts CW average power at 532nm in a TEMoo spatial mode, LH series lasers has quickly proven itself as the perfect DPSS pump laser for all types of Ti:Sapphire or dye laser.
Ideal for pumping of:

Trestles LH Ti:Sapphire laser
T&D-scan laser spectrometer based on narrow line CW Ti:Sapphire laser
 

New laser spectrometer OB' for research studies demanding fine resolution and high spectral density of radiation within UV-VIS-NIR spectral domains New laser spectrometer T&D-scan for research  that demands high resolution and high spectral density in UV-VIS-NIR spectral domains - now available with new pump option!
The T&D-scan includes a CW ultra-wide-tunable narrow-line laser, high-precision wavelength meter, an electronic control unit driven through USB interface as well as a software package. Novel advanced design of the fundamental laser component implements efficient intra-cavity frequency doubling as well as provides a state-of-the-art combined ultra-wide-tunable Ti:Sapphire & Dye laser capable of covering together a super-broad spectral range between 275 and 1100 nm. Wavelength selection components as well as the position of the non-linear crystal are precisely tuned by a closed-loop control system, which incorporates highly accurate wavelength meter.

Reserve a spot in our CW lasers training workshop in San Diego, California. Come to learn how to build a CW Ti:Sapphire laser from a kit
 

AOTF Infrared Spectrometer
Del Mar Photonics offer a handheld infrared spectrometer based on the acousto-optic tunable filter (AOTF). This instrument is about the size and weight of a video camera, and can be battery operated. This unique, patented device is all solid-state with no moving parts. It has been sold for a wide variety of applications such as liquid fuel analysis, pharmaceutical analysis, gas monitoring and plastic analysis. Miniature AOTF infrared spectrometer uses a crystal of tellurium dioxide to scan the wavelength. Light from a light source enters the crystal, and is diffracted into specific wavelengths. These wavelengths are determined by the frequency of the electrical input to the crystal. Since there are no moving parts, the wavelength scanning can be extremely fast. In addition, specific wavelengths can be chosen by software according to the required algorithm, and therefore can be modified without changing the hardware. After the infrared radiation reflects off of the sample, it is converted into an electrical signal by the detector and analyzed by the computer. Del Mar Photonics is looking for international distributors for RAVEN - AOTF IR spectrometer for plastic identification and for variety of scientific and industrial collaborations to explore futher commercial potential of AOTF technology.
New: AOTF spectrometer to measure lactose, fat and proteins in milk
 

Open Microchannel Plate Detector MCP-MA25/2

Open Microchannel Plate Detector MCP-MA25/2 - now in stock!
Microchannel Plate Detectors MCP-MA series are an open MCP detectors with one or more microchannel plates and a single metal anode. They are intended for time-resolved detection and make use of high-speed response properties of the MCPs. MCP-MA detectors are designed for photons and particles detection in vacuum chambers or in the space. MCP-MA detectors are used in a variety of applications including UV, VUV and EUV spectroscopy, atomic and molecular physics, TOF mass杝pectrometry of clusters and biomolecules, surface studies and space research.
MCP-MA detectors supplied as a totally assembled unit that can be easily mounted on any support substrate or directly on a vacuum flange. They also can be supplied premounted on a standard ConFlat flanges. buy online - ask for research discount!

 

Hummingbird EMCCD camera Hummingbird EMCCD camera
The digital Hummingbird EMCCD camera combines high sensitivity, speed and high resolution.
It uses Texas Instruments' 1MegaPixel Frame Transfer Impactron device which provides QE up to 65%.
Hummingbird comes with a standard CameraLink output.
It is the smallest and most rugged 1MP EMCCD camera in the world.
It is ideally suited for any low imaging application such as hyperspectral imaging, X-ray imaging, Astronomy and low light surveillance.
It is small, lightweight, low power and is therefore the ideal camera for OEM and integrators.
buy online
Femtosecond Transient Absorption Measurements system Hatteras Hatteras-D femtosecond  transient absorption data acquisition system
Future nanostructures and biological nanosystems will take advantage not only of the small dimensions of the objects but of the specific way of interaction between nano-objects. The interactions of building blocks within these nanosystems will be studied and optimized on the femtosecond time scale - says Sergey Egorov, President and CEO of Del Mar Photonics, Inc. Thus we put a lot of our efforts and resources into the development of new Ultrafast Dynamics Tools such as our Femtosecond Transient Absorption Measurements system Hatteras. Whether you want to create a new photovoltaic system that will efficiently convert photon energy in charge separation, or build a molecular complex that will dump photon energy into local heat to kill cancer cells, or create a new fluorescent probe for FRET microscopy, understanding of internal dynamics on femtosecond time scale is utterly important and requires advanced measurement techniques.

Reserve a spot in our Ultrafast Dynamics Tools training workshop in San Diego, California.
 

Beacon Femtosecond Optically Gated Fluorescence Kinetic Measurement System - request a quote  - pdf
Beacon together with Trestles Ti:sapphire oscillator, second and third harmonic generators. Femtosecond optical gating (FOG) method gives best temporal resolution in light-induced fluorescence lifetime measurements. The resolution is determined by a temporal width of femtosecond optical gate pulse and doesn't depend on the detector response function. Sum frequency generation (also called upconversion) in nonlinear optical crystal is used as a gating method in the Beacon femtosecond fluorescence kinetic measurement system. We offer Beacon-DX for operation together with Ti: sapphire femtosecond oscillators and Beacon-DA for operation together with femtosecond amplified pulses.

Reserve a spot in our Ultrafast Dynamics Tools training workshop in San Diego, California.
 

Terahertz systems, set ups and components
New band pass and long pass THz optical filters based on porous silicon and metal mesh technologies.
Band pass filters with center wavelengths from 30 THz into GHz range and transmissions up to 80% or better. Standard designs
with clear aperture diameters from 12.5 to 37.5 mm.
Long pass filters with standard rejection edge wavelengths from 60 THz into GHz range. Maximum transmission up to 80% or
better, standard designs at 19.0 and 25.4 mm diameters.
Excellent thermal (from cryogenic to 600 K) and mechanical properties
THz products:
THz Spectrometer kit with Antenna
THz transmission setup
THz time domain spectrometer Pacifica fs1060pca
THz time domain spectrometer Pacifica fs780pca
THz detectors: Golay cell and LiTaO3 piroelectric detectors
PCA - Photoconductive Antenna as THz photomixer
Pacifica THz Time Domain Spectrometer - Trestles Pacifica
Holographic Fourier Transform Spectrometer for THz Region
Wedge TiSapphire Multipass Amplifier System - THz pulses generation
Terahertz Spectroscopic Radar Mobile System for Detection of Concealed Explosives
Band pass filters with center wavelengths from 30 THz into GHz range
Long pass filters with standard rejection edge wavelengths from 60 THz into GHz range
Generation of THz radiation using lithium niobate
Terahertz crystals (THz): ZnTe, GaP, LiNbO3 - Wedge ZnTe

iPCA - interdigital Photoconductive Antenna for terahertz waves
Large area broadband antenna with lens array and high emitter conversion efficiency
iPCA with LT-GaAs absorber, microlens array for laser excitation wavelengths
l £  850 nm, adjusted hyperhemispherical silicon lens with a high power conversion efficiency of 0.2 mW THz power / W optical power. The iPCA can be used also as large area THz detector. The two types iPCAp and iPCAs have the same active interdigital antenna area but different contact pad directions with respect to the electrical THz field.
Interdigital Photoconductive Antenna for terahertz waves generation using femtosecond Ti:Sapphire laser

THz books
IntraStage lowers the cost of test data management!

Struggling with gigabytes or terabytes of test data?
IntraStage easily transforms test data from disparate sources into web-based quality metrics and engineering intelligence you can use.

Contact us today to discuss your test management requirements and specifications of your application.
 


Training Workshops

Come to San Diego next summer! Attend one of our training workshops in San Diego, California during summer 2011
Del Mar Photonics has presented training workshops for customers and potential customers in the past 3 years.
Our workshops cover scientific basics, technical details and provide generous time for hands-on training.
Each workshop is a three-day seminar conducted by professional lecturer from 10am to 4pm. It includes lunch, as well as a training materials. We have also reserved two days for Q&A sessions, one-on-one system integration discussions, social networking, and San Diego sightseeing.

The following training workshops will be offered during this summer:
1. Femtosecond lasers and their applications
2. CW narrow line-width widely tunable lasers and their applications
3. Adaptive optics and wavefront sensors

4. Ultrafast (femtosecond) dynamics tools

Featured Customer

Trestles LH10-fs/CW laser system at UC Santa Cruz Center of Nanoscale Optofluidics

Del Mar Photonics offers new Trestles fs/CW laser system which can be easily switched from femtosecond mode to CW and back. Having both modes of operation in one system dramatically increase a number of applications that the laser can be used for, and makes it an ideal tool for scientific lab involved in multiple research projects.
Kaelyn Leake is a PhD student in Electrical Engineering. She graduated from Sweet Briar College with a B.S. in Engineering Sciences and Physics. Her research interests include development of nanoscale optofluidic devices and their applications. Kaelyn is the recipient of a first-year QB3 Fellowship. In this video Kaelyn talks about her experimental research in nanoscale optofluidics to be done with Trestles LH laser.

Reserve a spot in our femtosecond Ti:Sapphire training workshop in San Diego, California during summer 2011


Frequency-stabilized CW single-frequency ring Dye laser DYE-SF-007 pumped by DPSS DMPLH laser installed in the brand new group of Dr. Dajun Wang at the The Chinese University of Hong Kong.
DYE-SF-077 features exceptionally narrow generation line width, which amounts to less than 100 kHz. DYE-SF-077 sets new standard for generation line width of commercial lasers. Prior to this model, the narrowest line-width of commercial dye lasers was as broad as 500 kHz - 1 MHz. It is necessary to note that the 100-kHz line-width is achieved in DYE-SF-077 without the use of an acousto-optical modulator, which, as a rule, complicates the design and introduces additional losses. A specially designed ultra-fast PZT is used for efficient suppression of radiation frequency fluctuations in a broad frequency range. DYE-SF-077 will be used in resaerch of Ultracold polar molecules, Bose-Einstein condensate and quantum degenerate Fermi gas and High resolution spectroscopy

Other News

Optical Society of Southern California meeting at UCSD OSSC 2011-04-27
Nd:YAG laser ordered by the University of Leon, UANL, Mexico
Wedge 50 Multipass Amplifier pumped with a Darwin-527-30-M DPSS Laser ordered by Hong Kong customer
New Trestles LH10-fs/CW femtosecond+CW laser ready for delivery to the University of California Santa Cruz
Trestles femtosecond Ti:Sapphire laser delivered to North Carolina State University
Del Mar Photonics sponsor IONS (International OSA Network of Students) conference IONS-NA-2 in Tucson, Arizona IONS-NA-2 website
Best talk and best poster awards at IONS-Moscow 2010 conference sponsored by Del Mar Photonics
Watch Del Mar Photonics videos!
Del Mar Photonics is now on Twitter!

Del Mar Photonics featured components

Del Mar Photonics continuously expands its components portfolio.


 
Solar Prisms for Concentrating Photovoltaic Systems (CPV)
Solar cells made of compound semiconductors such as gallium arsenide are very expensive. Usually very small cells are installed and various means such as mirrors, lenses, prisms, etc..are used  to concentrate sunlight on the cells. Concentration photovoltaic technology (CPV) uses the solar radiation with an efficiency of 40%, double that of conventional solar cells
Del Mar Photonics design custom Concentrating Photovoltaic Systems (CPV) and supply variety of the optical components for CPV such as solar prisms shown in the picture.
 

hexagonal light pipes, optical rods


 
Axicon Lens
Axicon lens also known as conical lens or rotationally symmetric prism is widely used in different scientific research and application. Axicon can be used to convert a parallel laser beam into a ring, to create a non diffractive Bessel beam or to focus a parallel beam into long focus depth.
Del Mar Photonics supplies axicons with cone angles range from 130?to 179.5?for use with virtually any laser radiation. We manufacture and supply axicons made from BK7 glass, fused silica and other materials.

download brochure -
request a quote
Del Mar Photonics offers optical elements made of high quality synthetically grown Rutile Titanium Dioxide crystals. Rutile (TiO2) coupling prisms
Del Mar Photonics offers optical elements made of high quality synthetically grown Rutile Titanium Dioxide crystals. Rutile抯 strong birefringency, wide transmission range and good mechanical properties make it suitable for fabrication of polarizing cubes, prisms and optical isolators. Boules having high optical transmission and homogeneity are grown by proprietary method. Typical boules have 10 - 15 mm in dia. and up to 25 mm length. Optical elements sizes - from 2 x 2 x 1 mm to 12.7 x 12.7 x 12.7 mm. Laser grade polish quality is available for finished elements. So far we the largest elements that we manufactured are 12 x15 x 5 mm, in which optical axis is parallel to 15 mm edge, 5 mm is along beam path, 12 x 15 mm faces polished 20/10 S/D, one wave flatness, parallelism < 3 arc.min. (better specs. available on request).

more details - download brochure -
request a quote

Vacuum viewport

Del Mar Photonics offer a range of competitively priced UHV viewports , Conflat, ISO or KF including a variety of coatings to enhance performance. Del Mar Photonics viewports are manufactured using advanced techniques for control of special and critical processes, including 100 percent helium leak testing and x-ray measurements for metallization control. Windows Materials include: Fused silica, Quartz , Sapphire , MgF2, BaF2, CaF2, ZnSe, ZnS, Ge, Si, Pyrex. Standard Viewing diameters from .55" to 1.94 ".
Coating - a range of custom coatings can applied - which include
- Single QWOT
- Broad Band AR
- V coatings
- ITO
- DLC (Diamond like coating)

more details - request a quote

 

 

Hydrogen Thyratrons are used in such devices as radars with different power levels, high-power pulsed technical, electrophysical, medical devices and lasers. Sophisticated design and high quality ceramic-metal envelope determines long lifetime and very accurate and reliable operation of hydrogen thyratrons under wide range of environmental conditions.
Applications:
- radars
- pulsed  lasers power supplies
- medical apparatus
- electrophysical instrumentation

Triggered Three-Electrode Spark Gap Switches are ceramic-metal sealed off gas discharge trigatron-type devices with a co-axial trigger electrode. These Gas Discharge Tubes contain no mercury and, due to an advanced design, feature high reliability and a long lifetime being operating under wide range of environmental conditions.

Applications:
- pulsed installation for processing materials
- installations with plasma focus
- pulse power supplies for lasers and other pulse equipment
- medical apparatus such as lithotriptors and defibrillators
- processing systems for petroleum wells
We are looking forward to hear from you and help you with your optical and crystal components requirements. Need time to think about it? Drop us a line and we'll send you beautiful Del Mar Photonics mug (or two) so you can have a tea party with your colleagues and discuss your potential needs.

 

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Del Mar Photonics, Inc.
4119 Twilight Ridge
San Diego, CA 92130
tel: (858) 876-3133
fax: (858) 630-2376
Skype: delmarphotonics
sales@www.alaindidierweill.com
 

 

Visit us at Photonics West in San Francisco!

Related presentations

Detection of calculus by laser-induced breakdown spectroscopy (LIBS) using an ultra-short pulse laser system (USPL)

Paper 7884-5 of Conference 7884
Date: Sunday, 23 January 2011
Time: 9:20 AM ?9:40 AM

Author(s): Florian Schelle, Stefanie Krueger, Bernd Oehme, Claudia Dehn, Matthias Frentzen D.D.S., Andreas Braun, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
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The aim of this study was to assess the detection of calculus by Laser Induced Breakdown Spectroscopy (LIBS). We used an Nd:YAG laser at 1064 nm, emitting 8 ps pulses with a repetition rate of 500 kHz. The average power was set to 5 W. With a spot size of about 30 祄, the intensity on the tooth surface led to plasma generation, which was spectrally analyzed. 15 teeth were used to assess the spectra of calculus and cementum separately. The obtained spectra differed statistically significantly. Using this new method, a reliable distinction between calculus and cementum is possible.

Depth-targeted transvascular drug delivery by using annular-shaped photomechanical waves

Paper 7902-30 of Conference 7902
Date: Sunday, 23 January 2011
Time: 1:00 PM ?1:20 PM

Author(s): Takuya Akiyama, Keio Univ. (Japan); Shunichi Sato, Hiroshi Ashida, National Defense Medical College (Japan); Mitsuhiro Terakawa, Keio Univ. (Japan)
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We examined the use of annular-shaped photomechanical waves (PMWs) to increase the pressure at target depths in tissue, by which the permeability of blood vessels located in the specific depth regions can be increased. We first confirmed an increased pressure at a target depth in tissue phantoms; target depth can be controlled by laser parameters. We injected evans blue (EB) into a rat vein and applied annular PMWs to the anterior tibialis. After perfusion fixation, we observed fluorescence originating from EB at a target depth of around 5 mm, demonstrating the capability of annular PMWs for depth-targeted transvascular drug delivery.

Patterning of indium-tin-oxide (ITO) films using laser-induced forward transfer (LIFT) technique

Paper 7940-36 of Conference 7940
Date: Tuesday, 25 January 2011
Time: 10:50 AM ?11:15 AM

Author(s): Hironobu Sakata, Tokai Univ. (Japan); Akira Yoshikado, Zeta Photon Co., Ltd. (Japan); Eisuke Yokoyama, Moriaki Wakaki, Tokai Univ. (Japan)
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Indium-tin-oxide (ITO) films are widely used as transparent conducting materials for electronic or optoelectronic devices. This study aims at the patterning of ITO films using the laser-induced forward transfer (LIFT) technique. A 2ωNd:YAG pulsed laser (530nm in wavelength) was irradiated on a glass substrate with ITO film on the rear side and the beam was scanned in one direction X, to which another receiving glass was placed with or without air gap. The beam was also moved to Y direction. Linear patterns of ITO film were deposited on the receiving glass by the beam scanning. ITO film patterning and In, Sn elements transfer during this process were confirmed by SEM observation and XPS measurement. Optimization of the laser irradiation conditions is needed further to obtain desired patterns.

Optically triggered Cr:YAG Q-switched Nd:YAG laser

Paper 7912-34 of Conference 7912
Date: Tuesday, 25 January 2011
Time: 2:30 PM ?2:50 PM

Author(s): Brian J. Cole, Alan D. Hays, Jonathan Lei, Bradley W. Schilling, Lew Goldberg, U.S. Army RDECOM CERDEC NVESD (United States)
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We describe a pulse timing jitter reduction technique for the passively Q-switched (PQS) Nd:YAG laser via direct bleaching of the Cr:YAG saturable absorber. It was found that a fluence of 70 kW/cm2, required to enable the optical triggering effect, could be reached using a single 3 mm wide mini-laser diode bar mounted on a compact heatsink. In order to miniaturize the triggering setup, a compact 300 A pulse driver, with a <0.5 microsecond rise-time and 3-5 microsecond duration was developed for pulsing the 3 mm diode bar. These components have been combined to demonstrate a compact brassboard implementation of the optically triggered passively Q-switched laser.

High-power diode pumped crystal fiber amplifier for passively Q-switched Nd:YAG microlaser

Paper 7912-38 of Conference 7912
Date: Tuesday, 25 January 2011
Time: 5:00 PM ?5:20 PM

Author(s): Igor Martial, Lab. Charles Fabry (France) and FiberCryst (France); François Balembois, Lab. Charles Fabry (France); Julien Didierjean, FiberCryst (France); Patrick Georges, Lab. Charles Fabry (France)
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The Master Oscillator Power Amplifier configuration is very useful to extend laser performance of passively Q-switched Nd:doped microlasers in view of material processing applications. Different configurations and gain media have already been used in the past few years and crystal fibers emerged as an interesting new laser medium bridging the gap between the bulk lasers and the fiber lasers. In this work, a passively Q-switched Nd:YAG microchip laser generating 80 礘, 500 ps pulses with a repetition rate of 1 kHz was efficiently amplified by a simple pass, diode-pumped Nd:YAG crystal fiber amplifier to achieve 1.2 mJ pulses.

High-power diode pumped crystal fiber amplifier for passively Q-switched Nd:YAG microlaser

Paper 7914-38 of Conference 7914
Date: Tuesday, 25 January 2011
Time: 5:00 PM ?5:20 PM

Author(s): Igor Martial, Lab. Charles Fabry (France) and FiberCryst (France); François Balembois, Lab. Charles Fabry (France); Julien Didierjean, FiberCryst (France); Patrick Georges, Lab. Charles Fabry (France)
Hide Abstract Add to My Schedule

The Master Oscillator Power Amplifier configuration is very useful to extend laser performance of passively Q-switched Nd:doped microlasers in view of material processing applications. Different configurations and gain media have already been used in the past few years and crystal fibers emerged as an interesting new laser medium bridging the gap between the bulk lasers and the fiber lasers. In this work, a passively Q-switched Nd:YAG microchip laser generating 80 礘, 500 ps pulses with a repetition rate of 1 kHz was efficiently amplified by a simple pass, diode-pumped Nd:YAG crystal fiber amplifier to achieve 1.2 mJ pulses.

A single frequency Nd:YAG Q-switched laser with timely controllable firing time by a gated Pockels cell

Paper 7912-84 of Conference 7912
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Frank F. Wu, Anatoliy I. Khizhnyak, Vladimir B. Markov, MetroLaser, Inc. (United States)
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A single frequency Q-switched Nd:YAG laser with time-controllable firing is discussed. A ring-cavity configuration is used to trap CW seeded radiation that equalizes a short pulse seeded in the slave cavity at Pockels cell's rising edge. Such seeding injection results in unidirectional Q-switched lasing.Our earlier design has utilized a two-Pockels cells configuration to open the slave cavity and dump the Q-switched laser pulse. Current design uses a single gated Pockels cell to realize the following two functions: (1) opening the slave cavity and at same time perform of seeding, and (2) dump the Q-switched pulse when the slave lasing is optimized. Since the Q-switch firing time is precisely controlled by the Pockels cell's timing, thus laser firing can be precisely time controlled. The advantage of the realized regime is in stable laser operation with no need in adjustment of the cavity mode. We demonstrate that the frequency of the Q-switched laser matches well to the injected laser.

Demonstration of a high power 1.5344 micrometer output Nd:YAG pumped OPO

Paper 7917-70 of Conference 7917
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Michael D. Wojcik, Robert Foltynowicz, Utah State Univ. (United States)
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Lidar remote sensing is gaining wider acceptance in environmental monitoring community. Therefore, eye-safety is an increasingly important requirement for lidar systems. High power laser pulses (> 200 mJ/pulse) are often required to achieve adequate signal-to-noise at meaningful ranges (>15 km) with a single laser shot. Nd:YAG based systems are a convenient and reliable way to achieve high power pulses, but there are substantial challenges to address when using a Nd:YAG to generate eye-safe (1.4-2.1 m) pulses. Here we demonstrate an optoparametric oscillator (OPO) with >20% conversion efficiency designed to be used as transmitter in a lidar remote sensor. The OPO is a regenerative circulating design using two KTA (=90? =0? as the non-linear media. The OPO is pumped by 45 W (1.5 J/pulse, 30 Hz) of 1064 nm light generated by an injection-seeded Nd:YAG laser. Significant performance enhancement was seen when the OPO was externally seeded using an external 1.5344 m DFB telecom laser.

Efficient compensation of thermal birefringence of a flash-lamp pumped Nd:YAG laser by a simple but novel method

Paper 7912-89 of Conference 7912
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Prasanta K. Datta, Shyamal Mondal, Satya P. Singh, Somenath Dutta, Sudarsan Bera, Subhra P. Dey, Indian Institute of Technology, Kharagpur (India)
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A simple but novel technique for eliminating depolarization loss resulting from thermally induced stress birefringence of a flash lamp-pumped free running Nd:YAG laser is reported here. The output characteristics of the beam with minimum depolarization loss have been systematically investigated by testing various resonator configuration, pump repetition rate and pump power for a Nd:Yag rod of 4mm diameter and 65mm length. It is shown that, by a tilted Glan-Taylor polarizer inside a stable cavity optimally reduces depolarization loss up to 13% for a nearly diffraction limited beam. The observed effect is accounted by determining the depolarization Loss function.

Influence of UV illumination on the cold temperature performance of a LiNbO3 Q-switched Nd:YAG laser

Paper 7912-76 of Conference 7912
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Brian J. Cole, Vernon King, Jeffrey Leach, Lew Goldberg, U.S. Army RDECOM CERDEC NVESD (United States)
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This paper will describe a technique based on UV illumination as a means to compensate pyrocharges accumulated on the end face of a LiNbO3 Q-switch that are associated with cold temperature operation and/or a rapid change in temperature. This method uses commercially available low cost UV LEDs that flood illuminate the LiNbO3 from the side. A LiNbO3 actively Q-switched Nd:YAG laser was evaluated over temperature and shown to have robust performance with rapid temperature cycling to cold temperatures (to negative 20C) in the presence of UV illumination, without evidence of pre-lasing that was otherwise observed with no UV illumination of the LiNbO3.

Laser micro welding of copper using a 532nm Nd:YAG laser

Paper 7920-51 of Conference 7920
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Geoff J. Shannon, Miyachi Unitek Corp. (United States)
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Significant growth for improved electrical or signal performance with minimizing component size is increasing the usage of high conductivity materials. Copper represents the number one material of choice however can present significant challenges for joining. The joining options available are crimping, soldering, ultrasonic bonding, resistance welding and laser welding. Crimping and soldering have several disadvantages that include low electrical conductivity connection and weak joints. Ultrasonic bonding is an effective technique for joining copper however is limited by the parts resistance to mechanical force, joint access and joint geometry. Resistance welding is a viable option however with small electrodes there is a major emphasis on electrode maintenance. Laser welding offers an autogenous non contact process with good weld strength and no weld consumables however due to the reflectivity of copper to the 1064nm laser light has struggled to provide a reliable welding solution, particularly for micro welding. Much of the previous work on laser micro welding of copper has centered around the use of anti reflection coatings, initial spike pulse shaping, oxygen assist gas mixtures, and the use of hybrid laser/laser welding techniques using a q switched 532nm coupling laser with a 1064nm pulsed Nd:YAG welding laser. These processes have been somewhat effective but do not offer a rugged high volume manufacturing solution. A 532nm pulsed Nd:YAG laser has been developed with millisecond pulses, 1.5kW peak power, 4J pulses and up to 5 W of average power to provide a laser source that offers stable volume production welding of small electrical connections. The patented laser architecture is briefly described, with the focus of the paper showing experimental processing data with examples of industrial applications.

Passively Q-switched quasi-continuously pumped 2.4% Nd:YAG laser in a bounce geometry

Paper 7912-73 of Conference 7912
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Michal Jelínek, Václav Kubecek, Miroslav Cech, Petr Hiršl, Czech Technical Univ. in Prague (Czech Republic)
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We report on quasi-continuously pumped laser based on highly 2.4at.% doped crystalline Nd:YAG in a bounce geometry passively Q-switched by a Cr:YAG and V:YAG saturable absorber respectively. The optimization of laser parameters and successive pulse amplification in the second Nd:YAG crystal led to efficient operation. At 1.06 um the oscillator 5 ns long output pulse with energy of 1.5 mJ was further amplified to 4 mJ. At 1.3 um the 13 ns long output pulse with energy of 600 uJ was amplified to 800 uJ in single pass. The details of resonator and pumping optimization will be also discussed.

Study on the 1123 nm continuous-wave ceramic Nd:YAG laser

Paper 7912-67 of Conference 7912
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Sasa Zhang, Qingpu Wang, Xingyu Zhang, Zhaojun Liu, Aiqun Long, Shandong Univ. (China)
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Highly efficient 1123 nm continuous-wave lasers are realized with ceramic Nd:YAG materials. A fiber-coupled continuous-wave 808-nm diode laser is used as the pumping source. Two ceramic Nd:YAG rods with the same length of 10 mm and different Nd-doping concentrations are employed during our experiments. With the same incident diode power of 26.1 W, a cw output power of up to 10.8 W is obtained with the 1.0 at. %-Nd-doped rod, while 8.2 W output power is generated from the 0.6 at. %-Nd-doped rod. The highest conversion efficiency from diode power to 1123-nm laser power is 43.8% and 31.4%, respectively, for the two Nd:YAG rods.

High power 808 nm VCSEL arrays for pumping of compact pulsed high energy Nd:YAG lasers operating at 946 nm and 1064 nm for blue and UV light generation

Paper 7912-36 of Conference 7912
Date: Tuesday, 25 January 2011
Time: 3:10 PM ?3:30 PM

Author(s): Robert Van Leeuwen, Yihan Xiong, Laurence S. Watkins, Jean-Francois Seurin, Guoyang Xu, Qing Wang, Chuni L. Ghosh, Princeton Optronics, Inc. (United States)
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High power 808 nm VCSEL arrays were developed to pump compact pulsed Nd:YAG lasers. A QCW side-pumped passively q-switched Nd:YAG laser operating at 1064 nm produced linearly polarized 4 ns IR pulses with 4.7 mJ pulse energy. These pulses were externally frequency doubled and quadrupled resulting in 2.5 mJ pulse energy at 532 nm and 0.8 mJ at 266 nm respectively. A similar but actively q-switched side-pumped Nd:YAG laser operating at the weaker quasi three-level 946 nm transition produced 12 mJ IR in a 27 ns pulse. This output was frequency doubled to produce 473 nm blue laser light.

Advances in Lasers and their Impact on Industrial Applications

Date: Wednesday, 26 January 2011
Time: 11:50 AM ?12:30 PM

Author(s):
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Paul E. Denney, Connecticut Ctr. for Advanced Technology, Inc. (USA)

Abstract: Industries have accepted lasers for a number of applications over the past twenty plus years. Laser cutting, drilling, additive manufacturing, marking, scribing/etching, and welding have been accepted as common practices by industries ranging from electronics to automotive. These applications primarily utilized carbon dioxide (CO2) and Nd:YAG lasers which had become "mature".
With development of direct diode, fiber, and disk based laser technologies, the type of lasers for industrial applications are again in flux. These new laser technologies offer economic and technical advantages over the traditional industrial lasers resulting in replacement of older system, expansion in applications for economic or technical reasons, and development of new applications. The presentation will concentrate on how the differences in the new laser technologies are impacting industrial applications and will give some examples.

Biography: Paul Denney is an Application Engineer at Lincoln Electric. He has over 28 years in laser materials processing previously working at the CCAT, EWI, ARL Penn State, Westinghouse Electric R & D Center, and the Naval Research Laboratory. Mr. Denney has his BS and MS in metallurgy from MIT. He is a Fellow Member of LIA and a member of ASM and AWS. He is a co-inventor on 14 laser related patents.

Modified Sellmeier equation for ZnGeP2 in the 0.97-1640μm range

Paper 7917-67 of Conference 7917
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Nobuhiro Umemura, Chitose Institute of Science and Technology (Japan)
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This paper reports the modified Sellmeier equations for ZnGeP2 (ZGP) that provide excellent reproduction of the phase-matching conditions for DFG between the two CO2 laser wavelengths, and the Nd:YAG laser and the Nd:YAG laser-pumped OPO in the THz region. Model calculations based on these Sellmeier equations strongly indicate that there is no significant difference in the refractive indices of the non-annealed and annealed crystals from 1.0642μm to 1640μm (0.18THz).

Output characteristics of 579nm Raman laser for medical application

Paper 7917-60 of Conference 7917
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Yeong-Sik Kim, Woo-Jin Jeon, Dankook Univ. (Korea, Republic of); Eun-Joo Hahn, Univ. of Suwon (Korea, Republic of)
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All-solid-state intracavity Raman laser using a ceramic Nd:YAG laser and a KGd(WO4)2 nonlinear crystal has been fabricated and its output characteristics has been investigated for the purpose of medical application. Yellow laser light at the wavelength of 579 nm could be obtained by 2nd harmonic generation using an LBO crystal from the 1st Stokes wavelength of 1159nm which was converted by stimulated Raman scattering with the fundamental wavelength of Nd:YAG laser.

Comparison of spectroscopic properties of neodymium-doped aluminium garnet (Nd:YAG) ceramics obtained by reactive sintering of Al2O3, Y2O3 and Nd2O3 and by synthesis of nanocrystalline Nd:YAG powders

Paper 7934-46 of Conference 7934
Date: Wednesday, 26 January 2011
Time: 6:00 PM

Author(s): Anna Kozlowska, Magdalena Nakielska, Institute of Electronic Materials Technology (Poland); Dariusz Podniesinski, Institute of Electronic Materials Technology (Poland) and Military Univ. of Technology (Poland); Helena Weglarz, Anna Wajler, Zdzislaw Librant, Tadeusz Lukasiewicz, Institute of Electronic Materials Technology (Poland)
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In the present work, the spectroscopic properties of ceramics obtained by two different methods are compared. First method relies on solid-state reaction of nanometric oxide powders, i.e. Al2O3, Y2O3 and Nd2O3. Second method is the synthesis of neodymium-doped aluminium garnet nanocrystalline powders prepared by coprecipitation technique. For all ceramic samples absorption, fluoresce and decay data is presented. In the part devoted to the Nd:YAG nanocrystalline powders, the spectroscopic data for both powders and synthesized ceramics is analyzed and discussed. Superior results have been obtained for the reactive sintering samples which show the spectroscopic properties comparable to single crystal counterparts.

Laser beam uniformity and stability using homogenizer based fiber optic launch method: square core fiber delivery

Paper 7894-39 of Conference 7894
Date: Sunday, 23 January 2011
Time: 1:40 PM ?2:00 PM

Author(s): Todd E. Lizotte, Hitachi Via Mechanics (USA), Inc. (United States)
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Over the years, technological achievements within the laser medical diagnostic, treatment, and therapy markets have led to ever increasing requirements for greater control of critical laser beam parameters. Increased laser power/energy stabilization, temporal and spatial beam shaping and flexible laser beam delivery systems with ergonomic focusing or imaging lens systems are sought by leading medical laser system producers. This paper covers the use of fiber optic beam delivery as a means of defining the beam shape (intensity/power distribution uniformity) at the target plane as well as the use of fiber delivery as a means to allow more flexible articulation of the laser beam over the surface being treated.

Efficient delivery of small interfering RNA into injured spinal cords in rats by photomechanical waves

Paper 7883G-135 of Conference 7883G
Date: Monday, 24 January 2011
Time: 8:30 AM ?8:50 AM

Author(s): Takahiro Ando, Keio Univ. (Japan); Shunichi Sato, Terushige Toyooka, Hiroaki Kobayashi, Hiroshi Nawashiro, Hiroshi Ashida, National Defense Medical College (Japan); Minoru Obara, Keio Univ. (Japan)
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In this study, we attempted to deliver fluorescent probe-labeled siRNAs into injured spinal cords in rats by applying photomechanical waves (PMWs) with the objective of gene therapy of spinal cord injuries. Intense fluorescence from siRNAs was observed in a much broader region of the spinal cords that had been exposed to PMWs when compared with those with siRNA injection alone. There were no significant differences in the results of functional evaluation between the rats with PMW application and those without PMW application. These results demonstrate the capability of PMWs for noninvasive, efficient delivery of siRNA into injured spinal cords.

Reliable laser micro-welding of copper

Paper 7920-6 of Conference 7920
Date: Monday, 24 January 2011
Time: 11:10 AM ?11:30 AM

Author(s): Christoph Rüttimann, Ulrich Duerr, LASAG AG (Switzerland); Anas Moalem, Laser Zentrum Hannover e.V. (Germany)
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The reliability of copper welds is still a problem today concerning the high demands of spot or contact welding for the electronic or medical industry. Two aspects characterising this reliability are tackled: the reproducibility of the weld geometry and the reduction of thermally induced side effects. Combining the laser wavelengths of 1064nm and 532nm, and using the drastic increase in absorption at 1 micron at higher temperatures leads to an efficient spot welding solution by using pulse forming with the thermal pulses of a Nd:YAG laser. A significant increase in weld reliability will be demonstrated.

Investigation on solid state Nd3+:YAG line beam laser annealing and texturing of amorphous silicon thin films

Paper 7920-21 of Conference 7920
Date: Tuesday, 25 January 2011
Time: 12:00 PM ?12:20 PM

Author(s): Nilesh J. Vasa, Anand I. Palani, Makaram Singaperumal, Indian Institute of Technology Madras (India)
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An attempt is made to produce textured poly-crystalline silicon from amorphous silicon (a-Si) using an Nd3+:YAG laser beam at 355 nm with a laser beam overlap technique. Two different beam profiles, namely, a Gaussian beam profile and a flat-top beam profile are considered for converting a-Si film into polysilicon film. The a-Si samples were treated with different laser fluence from 100-600 mJ/cm2 with 90% beam overlap. The crystallization and texturization characteristics were analyzed through SEM, Raman Spectroscopy, AFM, resistance and photoconductivity measurements. The production polycrystalline textured peaks was confirmed and photoconductivity characteristics were improved.

Investigation on solid state Nd3+:YAG line beam laser annealing and texturing of amorphous silicon thin films

Paper 7925-21 of Conference 7925
Date: Tuesday, 25 January 2011
Time: 12:00 PM ?12:20 PM

Author(s): Nilesh J. Vasa, Anand I. Palani, Makaram Singaperumal, Indian Institute of Technology Madras (India)
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An attempt is made to produce textured poly-crystalline silicon from amorphous silicon (a-Si) using an Nd3+:YAG laser beam at 355 nm with a laser beam overlap technique. Two different beam profiles, namely, a Gaussian beam profile and a flat-top beam profile are considered for converting a-Si film into polysilicon film. The a-Si samples were treated with different laser fluence from 100-600 mJ/cm2 with 90% beam overlap. The crystallization and texturization characteristics were analyzed through SEM, Raman Spectroscopy, AFM, resistance and photoconductivity measurements. The production polycrystalline textured peaks was confirmed and photoconductivity characteristics were improved.

A Joule-class, TEM00 spatial profile, narrow-linewidth laser system

Paper 7912-31 of Conference 7912
Date: Tuesday, 25 January 2011
Time: 1:30 PM ?1:50 PM

Author(s): Andreas Vaupel, Nathan Bodnar, Michaël Hemmer, Martin C. Richardson, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
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A Joule-class, narrow-linewidth amplifier line is presented. TEM00 beam profile, a high signal-to-ASE ratio, and narrow-linewidth are obtained through a Q-switched Nd:YAG oscillator with an intra-cavity volume Bragg grating (VBG). A series of flashlamp-pumped Nd:YAG amplifiers consisting of a double-pass and two single-pass amplifiers boost the energy of the 21 ns pulses to 480 mJ. The presented amplifier line will be used for several fundamental studies ranging from remote Raman spectroscopy to filamentation with ns pulses as well as to increase pump pulse energy in the HERACLES OPCPA facility, potentially leading to few-cycle pulses of 20 mJ pulse energy.

Enhanced pulsed Nd:YAG laser modeling and simulation for the design of low and medium energy laser systems (Oral Standby)

Paper 7915-18 of Conference 7915
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Samy S. A. Ghoniemy, Adel Mohamed, Military Technical College (Egypt)
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In this paper, a computationally efficient model for solid-state laser that includes power supplies, flashlamp, laser diode, and thermal effects is presented. The proposed model can accurately predicts the design parameters and dynamic behavior of passively Q-switched Nd:YAG lasers. It can also be used to study and analyze the impact of thermal heating on the overall laser system performance and the beam quality. Simulation results using the proposed enhanced model are in good agreement with the experimental and published results of commercial/lab realized systems and indicate that the proposed model has the capability to correctly predict the overall solid-state laser systems performance, and can be trusted during the design phase.

 

Energy scaling of nanosecond gain-switched Cr2+:ZnSe lasers

Paper 7912-51 of Conference 7912
Date: Wednesday, 26 January 2011
Time: 3:10 PM ?3:30 PM

Author(s): Vladimir V. Fedorov, The Univ. of Alabama at Birmingham (United States) and IPG Photonics - Mid-Infrared Lasers (United States); Igor S. Moskalev, Mike B. Mirov, IPG Photonics - Mid-Infrared Lasers (United States); Sergey B. Mirov, The Univ. of Alabama at Birmingham (United States) and IPG Photonics - Mid-Infrared Lasers (United States); Torrey J. Wagner, Matthew J. Bohn, Air Force Institute of Technology (United States); Patrick A. Berry, Kenneth L. Schepler, Air Force Research Lab. (United States)
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In this paper, we report record nanosecond output energies of gain-switched Cr:ZnSe lasers pumped by Q-switched Cr:Tm:Ho:YAG (100ns@2.096μm) and Raman shifted Nd:YAG lasers (7ns@1.906μm). In these experiments we used Brewster cut Cr:ZnSe gain elements with a chromium concentration of 8x1018 cm-3. Under Cr:Tm:Ho:YAG pumping, the first Cr:ZnSe laser demonstrated 3.1 mJ of output energy, 52% slope efficiency and 110 nm linewidth centered at a wavelength of 2.47 祄. Maximum output energy of the second Cr:ZnSe laser reached 10.1 mJ under H2 Raman shifted Nd:YAG laser pumping. The slope efficiency estimated from the input-output data was 47%.

Laser welding assembling of an implantable bio-medical device: investigation of temperature field

Paper 7921-31 of Conference 7921
Date: Wednesday, 26 January 2011
Time: 3:10 PM ?3:30 PM

Author(s): Yaomin Lin, Guangqiang Jiang, Joseph Calderon, Alfred E. Mann Foundation for Scientific Research (United States)
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We report a process of hermetically sealing the Functional Electrical Battery Powered Microstimulator (FEBPM) by laser welding technology for medical implants application. A pulsed 1064nm Nd:YAG laser system with a peak power capability of 6 Kw is employed in the study. An Eyelet Subassembly and a Case Subassembly are laser welded together, making a strong, hermetic joint. The materials are Ti-6Al-4V. To protect the subcomponents such as the battery and the electronic modules inside the case, and to maintain the mechanical integrity of the subassemblies, the temperature distribution along the laser weld joint is investigated by experimentation and numerical simulation.

Wavelength stabilized diode laser based devices free of power or efficiency penalties

Paper 7918-12 of Conference 7918
Date: Sunday, 23 January 2011
Time: 2:40 PM ?3:00 PM

Author(s): Keith W. Kennedy, nLIGHT Corp. (United States)
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Utilization of external volume gratings to improve TEM00 power scaling and overall conversion efficiency is rapidly expanding, particularly in pumping the narrow upper laser level of Nd:YAG DPSS lasers at 885 nm and the 1532 nm absorption band of Er:YAG DPSS lasers. It is often believed that the use of such external gratings to wavelength lock diode lasers leads to unavoidable losses in power and efficiency. nLIGHT's vertical integration and unique design methodology has eliminated these problem in our grating-locked diode laser products and will be demonstrated in several wavelength ranges targeting both DPSS as well as fiber laser systems.

Optical limiting behavior of Au-Ag nanoparticles under CW laser illumination

Paper 7922-17 of Conference 7922
Date: Monday, 24 January 2011
Time: 5:25 PM ?5:45 PM

Author(s): P. K. Palanisamy, Ramachandran Kasu, Kirubha Elangovan, Anna Univ. Chennai (India)
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Gold-Silver core shell nanoparticles have been synthesized using sodium borohydride as reducing agent and capped with citrate ions. The colloids are reddish brown in colour. The surface plasmon absorption band is located at 468.5nm. The nonlinear property of the prepared Au-Ag nanoparticles has been studied using closed aperture Z-scan technique using 532 nm CW output of diode pumped SHG Nd-YAG laser. The particles exhibit negative nonlinearity and hence used to demonstrate optical limiting property.

Ultrafast laser fabrication of 3D photonic structures in rare-earth doped glasses and nonlinear optical materials

Paper 7921-14 of Conference 7921
Date: Thursday, 27 January 2011
Time: 8:20 AM ?8:50 AM

Author(s): Kevin P. Chen, Univ. of Pittsburgh (United States)
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In this paper, we present research results on ultrafast laser fabrication of complex multi-layer optical structures in active glass and nonlinear optical materials. Multi-layer 4×4 lightwave circuits were fabricated in silica glass for inter-chip optical interconnect; ring oscillators were fabricated in Nd:YAG ceramic materials for on-chip waveguide laser; and o-ring resonators were laser written in LiNbO3 nonlinear crystals for all-optical optical switching.

Optical and thermal design of a compact passively Q-switched laser system for the Mars Organic Molecule Analyzer (MOMA)

Paper 7912-1 of Conference 7912
Date: Sunday, 23 January 2011
Time: 2:00 PM ?2:30 PM

Author(s): Christian Kolleck, Alexander Buettner, Mathias Ernst, Thomas Huelsenbusch, Tino Lang, Rajat Marwah, Marc Priehs, Dietmar Kracht, Jörg Neumann, Laser Zentrum Hannover e.V. (Germany)
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The Mars Organic Molecule Analyzer (MOMA) will be a laser-desorption mass spectrometer onboard the Pasteur Payload of the ExoMars rover. A lightweight passively q-switched solid-state laser system emitting at a wavelength of 266nm with pulse energies above 250礘 is required as excitation source. Near-flight prototypes based on Nd:YAG crystals with subsequent frequency conversion have been built and tested. During design optimization special emphasis was laid on the oscillator's energy stability and its mode behaviour with varying temperature. The thermal concept enables energy variation by temperature tuning of the frequency conversion crystals with minimum thermal influence on the directly neighboring oscillator.

Heat-generation caused by ablation of dental restorative materials with an ultra-short pulse laser (USPL) system

Paper 7884-18 of Conference 7884
Date: Sunday, 23 January 2011
Time: 4:30 PM ?4:50 PM

Author(s): Andreas Braun, Richard Wehry, Olivier Brede, Matthias Frentzen D.D.S., Florian Schelle, Rheinische Friedrich-Wilhelms-Univ. Bonn (Germany)
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The aim of this study was to assess heat generation in dental restoration materials following laser ablation using an Ultra Short Pulse Laser (USPL) system. Specimens of phosphate cement (PC), ceramic (CE) and composite (C) were used. Ablation was performed with an Nd:YAG laser at 1064 nm and a pulse length of 8 ps. Heat generation during laser ablation depended on the thickness of the restoration material. A time delay for temperature increase was observed in the PC and C group. Employing the USPL system for removal of restorative materials, heat generation has to be considered.

Photoacoustic generation using coded excitation

Paper 7899-78 of Conference 7899
Date: Tuesday, 25 January 2011
Time: 4:00 PM ?4:15 PM

Author(s): Shin-Yuan Su, Pai-Chi Li, National Taiwan Univ. (Taiwan)
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In photoacoustics, a Q-switched Nd:YAG laser providing mJ pulse energy is suitable for biomedical applications. However, such a laser is relatively bulky and expensive. An alternative way is to use a diode laser, which can achieve kHz pulse repetition frequency (PRF) but the laser energy is generally too low for effective PA generation. One method to enhance the PA signal is to use coded excitation. In this study, we proposed chirp coded excitation using a diode laser. The PRF of the laser pulse provided by our system can achieve 25-MHz. Chirp coded PA signal was generated by tuning the pulse duration of individual laser pulses with decreasing frequency in time domain. Result shows that the PA signal intensity can be enhanced after matched filtering. Nonetheless, high range sidelobes are also present.

Optical studies of a semiorganic nonlinear optical crystal: lithium p-nitrophenolate trihydrate

Paper 7917-59 of Conference 7917
Date: Tuesday, 25 January 2011
Time: 6:00 PM

Author(s): Philominal Arockiasamy, Dhanuskodi Sivasubramanian, Bharathidasan Univ. (India); Jacob Phillip, Cochin Univ. of Science & Technology (India)
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A semi-organic nonlinear optical material, lithium p - nitrophenolate trihydrate (LPNP) was synthesized. The thermal transport properties were measured by the photopyroelectric technique using He - Cd laser (120 mW, 442 nm). The dielectric constant at 305 K is 30, which remains invariant at higher frequencies. From the optical investigations, the transmittance window (450-1380 nm) and the direct optical band gap (2.47 eV) are found. Laser induced surface damage threshold is 0.95 GW/cm2 using Nd: YAG laser (1064 nm) and the relative powder SHG efficiency is 10 times that of KDP. Third order nonlinear response was studied following Z-scan technique with a He-Ne laser (632.8 nm, 35 mW). It is identified that the nonlinear absorption is due to the saturable absorption while the nonlinear refraction leads to self defocusing.

Course: Precision Laser Micromachining

Date: Wednesday, 26 January 2011
Time: 8:30 AM ?12:30 PM

Instructor(s): Ronald D. Schaeffer, PhotoMachining, Inc. (United States)
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This course is a comprehensive look at laser technology as applied to precision micromachining. A brief background discussion on laser history, technology and definition of important terms will be presented. Then, available laser sources will be compared and contrasted including CO2, excimer, Nd:YAG, fiber and short pulse lasers. IR and UV material/photon interaction, basic optical components and system integration are also crucial to getting good processing results and these will all be examined in detail. Finally, real applications from the medical, microelectronics, aerospace and other fields will be presented. This course has been greatly expanded to include detailed discussions on short pulse lasers (ps and fs) and their applications, both present and future. In addition, two market areas have been significantly updated - Aerospace/Defense and renewable energy, particularly Solar. One of the biggest growth markets in the laser future (and historically!), the growth of renewable energy applications will infuse hundreds of millions of dollars into the laser community as new electricity generating capability is brought on line.

Green range (520-565 nm) optical pumped stimulated emissions on 2D-DFB scheme from InGaN-based nanocolumn arrays

Paper 7939-51 of Conference 7939
Date: Wednesday, 26 January 2011
Time: 11:50 AM ?12:10 PM

Author(s): Katsumi Kishino, Shunsuke Ishizawa, R. Araki, K. Yamano, T. Kouno, Akihiko Kikuchi, Sophia Univ. (Japan)
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InGaN-based triangular lattice nanocolumn arrays with the lattice constant L from 255 to 285 nm were fabricated by the Ti-mask selective area growth of rf-MBE. The periodic arrangement in the nanocolumn arrays causes a strong intensity enhancement of light on 2-D distributed feed back (DFB) scheme at the photonic band edge. The samples fabricated were optically pumped with a 355 nm Nd:YAG laser at room temperature, successfully obtaining green range (520-565 nm in wavelength) stimulated emissions on the 2D-DFB scheme emitting. For a sample with L of 275 nm, the threshold excitation density was approximately 1 MW/cm2 at 552 nm.

Overview of ceramic laser technology

Paper 7912-63 of Conference 7912
Date: Thursday, 27 January 2011
Time: 10:30 AM ?11:00 AM

Author(s): Jasbinder S. Sanghera, U.S. Naval Research Lab. (United States)
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The field of transparent ceramic laser materials has seen significant improvements since the first demonstration of lasing in Dy3+:CaF2 ceramic in 1964. Considerable effort has gone into powder synthesis and purification, along with better sintering processes. Consequently lasing has been demonstrated in halide, oxide and chalcogenide ceramics. The efficiency and laser output power has been steadily increasing, especially within the last decade, to the point where 100 KW output power has now been demonstrated using Nd:YAG. In addition, the ceramic technology enables fabrication of novel architectures, including undoped claddings and graded doping profiles, as well as high doping levels which are not very practical using traditional single crystal technology. I will present an overview of the history and current status of ceramic laser technology, including recent developments from the author's lab.

Some properties of the mixed GaS0.4Se0.6 nonlinear crystal in comparison to GaSe

Paper 7917-51 of Conference 7917
Date: Thursday, 27 January 2011
Time: 1:35 PM ?1:55 PM

Author(s): Georgi Marchev, Aleksey Tyazhev, Vladimir L. Panyutin, Valentin P. Petrov, Frank Noack, Kentaro Miyata, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany); Michael Griepentrog, Bundesanstalt für Materialforschung und -prüfung (Germany)
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It is possible to dope GaSe with up to 40% of S preserving its non-centrosymmetric structure in order to increase the band-gap and improve the thermo-mechanical properties. We present here Sellmeier equations for the mixed nonlinear crystal GaS0.4Se0.6 which were refined by fitting to SHG phase-matching angle data as well as birefringence data obtained with phase plates. We present also comparison of two-photon absorption data at 1064 nm for GaS0.4Se0.6 and GaSe obtained with picosecond pulses which indicates that GaS0.4Se0.6 could be used in Nd:YAG laser pumped OPOs and OPAs without nonlinear absorption. The microhardness is compared with nanoindentation tests.

Laser laparoscopic partial nephrectomy in clinical cases(n=17)

Paper 7883B-52 of Conference 7883B
Date: Saturday, 22 January 2011
Time: 3:30 PM ?3:50 PM

Author(s): Oleg Teodorovich, Central Clinical Hospital No. 1 JSC RZD (Russian Railways) (Russian Federation); Natalia Zabrodina, Eduard Galljamov, Inna Yankovskaya, Central Clinical Hospital of Civil Aviation (Russian Federation); David Kochiev, A. M. Prokhorov General Physics Institute (Russian Federation); Alexei Lukashev, Astelia Technologies (United States)
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A pulsed Nd:YAG laser approved for clinical use in Russian Federation was used for laparoscopic partial nephrectomy(LPN). Patients with Ò1N0M0 (N=17) underwent laser LPN during 2006-2009 for removal tumor sized from 2.0 to 3.9 cm. Successful laser LPN was performed without ischemia in all cases. Bleeding during laser LPN was substantially reduced due to laser coagulation. Currently all patients are under medical supervision with no re-occurrence of tumor. The results for laser LPN were compared to similar cases with cold scissors resection and thermal ischemia. A pulsed Nd:YAG laser showed safety and efficacy for LPN resection in humans. A pulsed Nd:YAG laser showed safety and efficacy for LPN resection in humans.

Realization of high-performance optical element by optical near-field etching

Paper 7921-20 of Conference 7921
Date: Thursday, 27 January 2011
Time: 11:20 AM ?11:50 AM

Author(s): Kazuya Hirata, Sigma Koki Co., Ltd. (Japan)
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Recent year, they require the high performances of laser as a light source in variety application area. For instance, those are a shorter wavelength, a shorter pulse width. In order to serve those needs, an improvement of the laser damage threshold value of optical element used in the laser applications is required. And they reported that a surface-roughness of glass substrate as used coated optical element exert also influence that. Currently, the chemical mechanical polishing method (CMP method) is general used as the polishing method of optical element. This method is a friction method. Therefore, the reduction of the surface-roughness is prevented by generation of scratches and digs that keep happening by contamination in slurry. In order to solve this problem, we propose the optical near-field etching method (ONE). The ONE is operated by irradiation of a SHG light (=532nm) of Nd:YAG laser on glass substrate in chlorine gas atmosphere that have a optical absorption band edge of 400nm. The radical formation of the chlorine molecular is created by non-adiabatic photochemical reaction due to optical near-field occurred in glass surface. And the etching is progressed in the projection of glass surface. With this processing, we can achieve the reduction of Ra value of surface-roughness from 0.2nm to 0.13nm. In addition, we gave the mirror coating to the glass substrate to which the surface-roughness was improved by ONE and measured the laser damage threshold value, and so we obtained 14.0J/cm2 as the laser damage threshold value. The laser damage threshold value of the glass substrate without ONE is 8.2J/cm2. It is shown that the laser damage threshold increase by 1.7 times by ONE.
 

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