| Laser with Wavelength 589nm - Sodium Wavelength Laser |
2000 |
22 pages |
| Authors:
Nikolay IIichev; GENERAL PHYSICS INST MOSCOW (USSR)
|
 | This report results from a contract tasking General Physics Institute as follows: The contractor will develop a laser system based on F2 color centers in LiF crystals with frequency doubling to produce from 10 to 40W of average output power at 589 nm. |
|
| Optical Field Reconstruction Using Phase-Space Tomography |
21 DEC 1999 |
3 pages |
| Authors:
Michael G. Raymer; OREGON UNIV EUGENE DEPT OF PHYSICS
|
| Measurement of light transport in a random, multiple scattering medium can provide details about the spatial structure of inhomogeneities within the medium. Progress made includes construction of a new system for making measurements of the complex, two-point optical field correlation function for continuous-wave laser light after propagating through a random-dielectric medium, in particular polystyrene spheres in water. The new system is based on a Sagnac shearing ... |
|
| High-Speek Polymer Fiber Electrooptic Modulators and Devices |
10 DEC 1999 |
9 pages |
| Authors:
Mark G. Kuzyk; WASHINGTON STATE UNIV PULLMAN
|
| Funds from this grant were used to buy a continuous tunable laser source and electronics package that is being used for electrooptic modulation experiments in unique electrooptic fibers that are made in our laboratory. In addition, this proposed laser system compliments our present fiber characterization experiments that include linear absorption, scattering, refractive index, stimulated Brillouin scattering, quadratic electrooptic measurements, fluorescence, Photobleaching, and photoisomerization. ... |
|
| Advanced Semiconductor Lasers and Their Applications. Volume XXXI |
NOV 1999 |
225 pages |
| Authors:
Leo Hollberg; Robert J. Lang; OPTICAL SOCIETY OF AMERICA WASHINGTON DC
|
| This volume of Trends in Optics and Photonics (TOPS) collects the papers from the 3rd ASLA conference, held July 21-23, 1999, in Santa Barbara, California. Continuing the tradition of diversity of this conference, the papers presented covered wavelengths from the visible to sub-millimeter, with spectral properties ranging from oscillations and chaos to high-purity single-mode operation. A particularly strong application area as always was sensing and ... |
|
| Applications of Photorefractive and Resonant Systems to Optical Signal Processing |
AUG 1999 |
11 pages |
| Authors:
Mark Cronin-Golomb; Venkatapuram S. Sudarshanam; TUFTS UNIV MEDFORD MA
|
| The experiments done in this grant can be broadly classified into two stages. The goal of both these stages was to demonstrate all-optical high-speed turbulence aberration correction through nonlinear optical phase conjugation. The first stage involved the development of a phase conjugate mirror (PCM) based on non-degenerate four-wave-mixiag (NDFWM). Coherent population trapping (CPT) in sodium vapor permitted the use of low intensity cw lasers. The second stage involve the development ... |
|
| Wavelength Multiplexed Electro-Optically Controllable, Fiber Optic Multi-Tap Delay Line |
29 JUN 1999 |
7 pages |
| Authors:
William K. Burns; Lesli E. Chipman; Robert P. Moeller; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The wavelength multiplexed, electro-optically controllable, fiber optic multi-tap delay line utilizes a first output signal from a plurality of amplitude adjustable continuous-wave (CW) optical lasers multiplexed to form a combined optical signal onto which a radio frequency signal is imposed thereby shifting the combined optical signal which is then demultiplexed. A second output signal of the plurality of CW lasers is phase adjusted and combined with the demultiplexed combined optical ... |
|
| 3.3 W Injection Heterolaser Based on Self-Organized Quantum Dots |
18 JUN 1999 |
3 pages |
| Authors:
A. R. Kovsh; D. A. Livshits; A. E. Zhukov; A. Y. Egorov; V. M. Ustinov; RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
|
| This work demonstrated room temperative CW lasing via the QD states with the maximum output power as high as 3 3 W. This result points out that QDs can be used as an active region of injection lasers for high-power applications. We believe that further progress can be achieved by optimizing both the design of active region and the fabrication of laser diodes. |
|
| Proceeding of the 1999 Particle Accelerator Conference. Volume 2 |
02 APR 1999 |
852 pages |
| Authors:
A. Luccio; W. MacKay; LASERS AND ELECTRO-OPTICS SOCIETY (IEEE) PISCATAWAY NJ
|
| The topics of this volume include: (1) accelerator ring control systems, (2) room temperature RF, (3) superconducting RF, (4) RF power sources, (5) feedback systems, (6) beam injection/extraction, transport and targetry, (7) cryogenics, (8) vacuum technology, (9) alignment and survey, and (10) subsystems, technology and components. |
|
| Raman Excited Spin Coherences for Turbulence Imaging |
APR 1999 |
|
| Authors:
Selim Shahriar; Shaoul Ezekiel; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
 | The objective of this project was to explore the feasibility of using Raman excited spin coherence for turbulence imaging. We experimentally demonstrated that it is possible to use degenerate four-wave mixing (DFWM) in Na vapor to correct intracavity high-speed turbulence aberrations. The use of sodium vapor as a phase conjugate mirror (PCM) provides gains greater than unity and an ideal response time of about 16 nsec, even with cw laser ... |
|
| APEX Support |
FEB 1999 |
9 pages |
| Authors:
SCHAFER CORP ARLINGTON VA
|
| Under the APEX program, Schafer Corporation has been supporting both the Ballistic Missile Defense Organization and the Naval Research Laboratory (NRL) in investigating the potential of using nonlinear optical techniques as well as other advanced technologies to improve the performance and/or the system integration and operation of CW high energy lasers, specifically the HF/DF chemical laser. The goal of the APEX program is to provide a CW demonstration of beam ... |
|
| Ultrafast Nonlinear Optical Spectroscopy |
06 JAN 1999 |
35 pages |
| Authors:
Kelvin Wagner; Balakishore Yellampalle; Sam Weaver; Steve Blair; COLORADO UNIV AT BOULDER OPTOELECTRONICCOMPUTING SYSTEMS CENTER
|
| We have developed an Ultrafast optical nonlinear spectroscopy facility with the motivation of studying spatio-temporal soliton interactions for all-optical switching application and several associated nonlinear optical process. The Ultrafast Optics Lab consists of a >20GW peak power sub-50fs 1KHz pulsed amplified Ti:Sapphire laser system. The laser system consists of an oscillator, a CW pump laser, regenerative amplifier and pulsed pump laser. These high peak power pulses are used in a ... |
|
| (AASERT 95) Short Wavelength Fiber Lasers |
SEP 1998 |
13 pages |
| Authors:
Eden; ILLINOIS UNIV CHAMPAIGN
|
| Graduate students involved in a research program at the University of Illinois focused on fabricating microdischarge devices and arrays on silicon. Our goal is to combine two disparate and seemingly incompatible technologies discharge physics and engineering with silicon planar processing technology to produce a new generation of on-chip devices and systems. The primary result of this research effort is the demonstration and development of small discharge ... |
|
| Calculation of Hazard Distances for Scanning, Repetitively Pulsed Laser Systems |
AUG 1998 |
|
| Authors:
Alasdair McInnes; James Richards; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION SALISBURY (AUSTRALIA)
|
| This report details a methodology of evaluating the eye hazards due to scanning, repetitively pulsed laser radar systems. A computer model developed for carrying out such calculations is described in detail, and applied to an experimental laser radar system currently being developed in DSTO. |
|
| Mechanisms of Photo-Oxidative Stress in Retinal Pigment Epithelium: Is Melanin a Photosensitizer? |
14 JUL 1998 |
27 pages |
| Authors:
Randolph D. Glickman; TEXAS UNIV HEALTH SCIENCE CENTER AT SANANTONIO DEPT OF OPHTHALMOLOGY
|
| The cellular pigments of the retinal pigment epithelium (RPE) have been shown to catalyze free radical activity, especially when illuminated with visible or ultraviolet light. This activity is sufficient to cause photooxidation of several major cellular components, including proteins, fatty acids, as well as antioxidants, and other small molecules. Similar reactivity of melanin granules has been demonstrated in intact RPE cells by the use of ... |
|
| Mechanisms of Photooxidative Stress in Retinal Pigment epithelium: Is Melanin a Photosensitizer? |
14 JUL 1998 |
27 pages |
| Authors:
Randolph D. Glickman; TEXAS UNIV HEALTH SCIENCE CENTER AT SANANTONIO DEPT OF PHARMACOLOGY
|
| The cellular pigments of the rectinal pigment epithelium (RPE) have been shown to catalyze free radical activity, especially when illuminated with visible or ultraviolet light. This activity is sufficient to cause photooxidation of several major cellular components, including proteins, fatty acids, as well as antioxidants, and other small molecules. Similar reactivity of melanin granules has been demonstrated in intact RPE cells by the use of ... |
|
| Mechanisms of Photooxidative Stress in Retinal Pigment Epithelium: Is Melanin a Photosensitizer? |
14 JUL 1998 |
27 pages |
| Authors:
Randolph D. Glickman; TEXAS UNIV HEALTH SCIENCE CENTER AT SANANTONIO DEPT OF OPHTHALMOLOGY
|
| The cellular pigments of the retinal pigment epithelium (RPE) have been shown to catalyze free radical activity, especially when illuminated with visible or ultraviolet light. This activity is sufficient to cause photooxidation of several major cellular components, including proteins, fatty acids, as well as antioxidants, and other small molecules. Similar reactivity of melanin granules has been demonstrated in intact RPE cells by the use of ... |
|
| Characterisation of Biological Aerosol with a Fluorescent Aerodynamic Particle Sizer in Outdoor Environment |
JUN 1998 |
|
| Authors:
Jim Ho; M. Spence; P. Hairston; DEFENCE RESEARCH ESTABLISHMENT SUFFIELDRALSTON (ALBERTA)
|
| Biological aerosol measurement in real time is an urgent military requirement that also has many potential non-military applications. Such detection capabilities will be useful in environmental monitoring, for example, in gathering information in perceived hazardous areas like housing developments downwind of sewage treatment plants. Experience gained from measuring fluorescence signals of single bacterial spores under flow cytometry using UV excitation at 340-360 nm, ... |
|
| 1:N Space Division Switches for Optical Routing, Reconfigurable Interconnections, and Time and Wavelength-Division Switching Applications |
MAY 1998 |
16 pages |
| Authors:
D. B. Shire; C. L. Tang; CORNELL UNIV ITHACA NY
|
| We report the first observation of two-mode intensity bistability in intracavity-coupled in-plane lasers and oxide-confined vertical-cavity surface emitting lasers (VCSELs) operating under room-temperature continuous wave (CW) conditions. These devices have been integrated in a monolithic all-optical 1xN routing switch. The VCSEL sections act as output couplers for modulation signals introduced to the main ridge-waveguide in-plane laser or the side in-plane control lasers, and the combined devices are capable of time-division ... |
|
| Background Aerosol Characteristics Measured with a Fluorescence Aerodynamic Particle Sizer: Sensitivity of FLAPS Performance |
MAR 1998 |
|
| Authors:
Jim Ho; Mel Spence; DEFENCE RESEARCH ESTABLISHMENT SUFFIELDRALSTON (ALBERTA)
|
| From observations done with flow cytometry, it was found that a single spore in liquid stream could be induced to fluoresce at 34060 run. In a prototype instrument, similar results were obtained when spore particles in air were excited with a CW UV laser. The current instrument, Fluorescence Aerodynamic Particle Sizer (second generation FLAPS2) measures particle size as well as intrinsic fluorescence characteristics of individual particles in an aerosol stream. ... |
|
| Development of Diode-Pumped Color Center Laser with Methane Absorption Cell for Optical Frequency Standard (3.3 Micron Wavelength Range) |
1998 |
15 pages |
| Authors:
Mikhail Gubin; LEBEDEV PHYSICS INST MOSCOW (RUSSIA)
|
| This report results from a contract tasking Lebedev Physics Institute as follows: The contractor will investigate and develop a diode-pumped color- center laser and methane cell for use in developing an optical frequency standard at 3.3 microns. Tasks to be include under this project are: (1) development and investigation of a cw, tunable, color-center laser operating in the 3.0 to 3.3 micron that is pumped by a laser diode (array), ... |
|
| Laser with Wavelength 589 nm (Sodium Wavelength Laser) |
1998 |
17 pages |
| Authors:
Nikolay Llichev; GENERAL PHYSICS INST MOSCOW (USSR)
|
| This report results from a contract tasking General Physics Institute as follows: The contractor will investigate the possibility of producing a laser operating on 589 nm with 10-40 Watts output power based upon frequency doubling of a LiF crystal with F_2^- color centers as detailed in the proposal. |
|
| Advanced Diagnostics for Reacting Flows |
19 DEC 97 |
33 pages |
| Authors:
Ronald K. Hanson; STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING
|
| Progress is reported for the past three years of a research program on advanced diagnostic techniques for combustion gases and plasmas. The techniques studied are based on laser spectroscopy, particularly spectrally- resolved absorption and laser-induced fluorescence. Laser sources include tunable cw diode lasers and tunable (or fixed-frequency) pulsed lasers. The cw lasers are spectrally narrow, allowing study of innovative techniques based on spectral lineshapes, while the pulsed lasers provide intense ... |
|
| Continuous Wave Singly Resonant Intracavity Optical Parametric Oscillators Using Periodically Poled LiNbO3 |
07 OCT 1997 |
117 pages |
| Authors:
Leonel P. Gonzalez; DAYTON UNIV OH CENTER FOR ELECTRO-OPTICS
|
| The use of continuous wave singly resonant optical parametric oscillators (CW SROs) has been limited in the past mainly because of the high threshold powers necessary. Thresholds of SROs are orders of magnitude greater than doubly resonant oscillators. While lithium niobate has long been in use as a nonlinear material, periodically poled lithium niobate (PPLN) recently emerged as an excellent source for CW SROs. Quasi-phase matching ... |
|
| Application of Laser-Induced Fluorescence (LIF) to Liquid-Propellant Rocket Engine Testing |
OCT 1997 |
12 pages |
| Authors:
C. W. Brasier; J. A. Drakes; M. A. Simmons; SVERDRUP TECHNOLOGY INC ARNOLD AFS TN
|
| Combustion exhausts present a challenging problem for researchers due to the extremely harsh environment, and nonintrusive diagnostics are often sought to provide flow property information. Laser induced fluorescence (LIF) is one technique in which a chosen flow molecule or marker is probed to yield gross flow properties, such as static temperature and flow velocities. The work presented herein describes the application of LIF to the combustion exhausts of several full-scale ... |
|
| Mechanism and Applications of Microwave-Frequency Intensity Oscillation of Laser Diodes with Short External Cavity |
OCT 97 |
23 pages |
| Authors:
Guifang Li; ROCHESTER INST OF TECH NY
|
| This effort investigates the mechanism and applications of microwave- frequency intensity oscillation of laser diodes with short external cavity. Future Air Force analog fiber optic links will require RF bandwidths of 10-60 GHz with dynamic range greater than 120 dB. Systems are investigated here which could deliver these specifications in a compact, light weight and low power approach. A theoretical simulation is presented using a nonlinear dynamic point of view. ... |
|
| Thermal Relaxation Processes and Stability in Poled Electro-Optic Polymers |
28 AUG 97 |
77 pages |
| Authors:
Kenneth D. Singer; CASE WESTERN RESERVE UNIV CLEVELAND OH
|
| The goal of gaining better understanding of the orientational decay mechanisms of poled nonlinear optical polymers and to develop a predictive description of the long time scale decay was well met. We developed a new experimental technique based on electric field induced second harmonic generation in the frequency domain to probe the polymer over many decades of time. This technique is best applied near the glass transition to probe frequencies ... |
|
| Optical Resonators - Science and Engineering |
01 AUG 97 |
493 pages |
| Authors:
Ram Kossowsky; Miroslav Jelinek; Josef Novak; CZECHOSLOVAK ACADEMY OF SCIENCES PRAGUE INST OF PLASMA PHYSICS
|
| This report contains conference proceedings concerning the following topics related to optical resonators: (1) physics and theory, (2) phase conjugation, (3) optics, and (4) optimization of design. |
|
| Thermal Relaxation Processes and Stability in Poled Electro-Optic Polymers |
AUG 97 |
77 pages |
| Authors:
Kenneth D. Singer; CASE WESTERN RESERVE UNIV CLEVELAND OH
|
| The goal of gaining better understanding of the orientational decay mechanisms of poled nonlinear optical polymers and to develop a predictive description of the long time scale decay was well met. We developed a new experimental technique based on electric field induced second harmonic generation in the frequency domain to probe the polymer over many decades of time. This technique is best applied near the glass transition to probe frequencies ... |
|
| Harmonic Millimeter Radiation from a Microwave Free Electron Laser Amplifier |
JUN 97 |
91 pages |
| Authors:
Yan-Hua Liu; COLUMBIA UNIV NEW YORK SCHOOL OF ENGINEERING AND APPLIED SCIENCE
|
| In this project an electron beam is bunched at a microwave frequency and the harmonics of this bunching drive radiation at millimeter wavelengths, using a FEL configured as a single pass traveling wave amplifier. A 10kW 24GHz microwave input signal grows to 200kW level using the lower frequency unstable root of the waveguide FEL dispersion relation. The Columbia FEL facility operates at this frequency in the TE11 mode, using a ... |
|
| A CW Laser Master Oscillator for a Scaleable Sodium Guide Star. General Issues |
97 |
25 pages |
| Authors:
Geoff Hogan; C. E. Webb; OXFORD UNIV (UNITED KINGDOM) CLARENDON LAB
|
| This report results from a contract tasking Claredon Laboratory as follows: The contractor will construct a CW dye laser that functions as a master oscillator. The output of the oscillator will be locked to a relevant sodium line and will be broadened to efficiently excite mesopheric sodium. In order to conduct this oscillator the contractor will design and construct an atomic sodium frequency lock and investigate schemes for line broadening ... |
|
| Gateable CCD Detector for Laser Spectroscopic Identification of Aerosols |
01 AUG 96 |
23 pages |
| Authors:
Richard K. Chang; YALE UNIV NEW HAVEN CT DEPT OF APPLIED PHYSICS
|
| We summarize the new accomplishments that were made possible as a result of the acquisition of two CCD detectors (one gateable CCD detector and one liquid nitrogen cooled CCD detector, both from Princeton Instruments) with one common controller. Progress has been made jointly with Drs. Ronald Pinnick and Steven Hill (of the Army Research Laboratory, WSMR, NM) mainly in the area of fluorescence-spectra determination of single biological airborne particle as ... |
|
| Diode Pumped Frequency Doubled Yag Laser for the Treatment of Glaucoma |
AUG 96 |
39 pages |
| Authors:
Rafael A. Sierra; FIBEROPTIC FABRICATION INC EAST LONGMEADOW MA
|
| The Phase 1 STTR technical effort demonstrated the safety and efficiency of a continuous wave (cw) diode pumped frequency doubled YAG laser for the treatment of glaucoma. In-vitro and in-vivo experiments were conducted to establish safety and to identify the procedures best suited for this laser. The laser was fabricated according to a design developed at the Air Force Phillips Laboratory. The most significant result of the work was the ... |
|
| Laser with Multiple Gain Elements. |
18 JUN 1996 |
|
| Authors:
Richard Scheps; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A tunable laser produces laser emission at least two wavelengths simultaneously. The tunable laser includes at least two gain elements where each gain element generates a different wavelength. Means for optically exciting each laser gain element is appropriately disposed for either end pumping or side pumping to produce a laser emission within a preselected range of wavelengths. A wavelength dispersing element such as a prism is disposed in the laser ... |
|
| Power Recovery of Radiation Damaged MOCVD Grown Indium Phosphide on Silicon Solar Cells Through Argon-Ion Laser Annealing |
JUN 96 |
149 pages |
| Authors:
Lynn L. Boyer Iv; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis reports the results of a laser annealing technique used to remove defect sites from radiation damaged indium phosphide on silicon MOCVD grown solar cells. This involves the illumination of damaged solar cells with a continuous wave laser to produce a large forward-biased current. The InP/Si cells were irradiated with 1 MeV electrons to a given fluence, and tested for degradation. Light from an argon laser was used to ... |
|
| Optical Modulator LM 0202 P Characteristics: Application to Amplitude Modulation of Argon-Ion Laser |
JUN 96 |
84 pages |
| Authors:
Michael C. Ladner; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The purpose of this thesis is to examine the possibility of using a commercial elecro-optic modulator, the LM 0202 P modulator manufactured by Gsanger Opto-Elektroniks of Germany, to provide an amplitude modulated light source to test a theory of the conversion of amplitude to frequency modulation of light in fiber optics. The main focus of this thesis is to experimentally determine the performance characteristics of the modulator including the frequency ... |
|
| OEIC Transmitters Employing Ultra Low Threshold Three Terminal Lasers |
MAY 96 |
139 pages |
| Authors:
P. D. Dapkus; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| A program of research to investigate the integration of optoelectronic and electronic devices for transmitters is described. The report describes research aimed at developing low threshold laser for using in these transmitters and describes three different types of lasers: a folded cavity surface emitting laser, an ultralow threshold intracavity contacted vertical cavity laser structure and an ultralow threshold, electrically isolated vertical cavity laser structure employing oxide semiconductor Bragg mirrors. In ... |
|
| Laser-Differential Interferometer Applications in Gas Dynamics |
16 APR 96 |
67 pages |
| Authors:
G. Smeets; A. George; INSTITUT FRANCO-ALLEMAND DE RECHERCHES SAINT-LOUIS (FRANCE)
|
| The laser-differential interferometer described in ISL-T 21/70 and ISL-14/71 underwent further development. It now constitutes a versatile measurement instrument able to be utilized advantageously in the following fields: flow calibration in gas-dynamic facilities, compressible gas dynamics, in particular various types of boundary layers, gas kinetics or chemical kinetics, turbulence investigations, acoustics. The optical arrangements suitable for the respective problems - for the most part already tested - are systematically compiled, ... |
|
| Laser-Interferometer with Phase Compensation |
16 APR 96 |
39 pages |
| Authors:
G. Smeets; A. George; INSTITUT FRANCO-ALLEMAND DE RECHERCHES SAINT-LOUIS (FRANCE)
|
| In the light path of a double-beam interferometer operated with continuous laser light a compensator is located. This is an electrically controllable, artificial phase object, which instantly compensates for any variations in path length caused by the object under observation. To achieve this, the change in voltage on the compensator is proportional to the change of the optical path length due to the event. The result of this is an ... |
|
| Laser Technology (Selected Articles) |
09 APR 96 |
49 pages |
| Authors:
NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| This paper presents high-energy CW HF/DF chemical lasers developed under the U.S. Navy Sealite program and the Alpha program of the DARPA Triad program, and a brief account of Soviet chemical lasers. Continuous wave HF/DF chemical lasers were developed starting in the late sixties as high-power lasers of consistent interest to military circles. These are lasers that have the most matured technology among present-day high-energy lasers. It is hoped that ... |
|
| The Measurement of a High-Power CO2 Laser's Far-Field Output Intensity Distribution |
APR 96 |
19 pages |
| Authors:
Jang Lijang; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| An experimental method for measuring the far field intensity distribution of a TE CW CO2 laser beam by two dimensional scanning is described. The reliability and practicability of the measurement system have been discussed in details. The measurements of a TE CW CO2 laser with 2 kW output are given. ANNOTATION: The Measurement of a High-Power CO2 Laser's Far-Field Output Intensity Distribution. --Translation. |
|
| Annealing of Defect Sites in Radiation Damaged Indium Phosphide Solar Cells Through Laser Illumination |
DEC 95 |
125 pages |
| Authors:
Charles T. Chase; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis reports the results of a laser annealing technique used to remove defect sites from radiation damaged indium phosphide diffused junction solar cells. This involves the illumination of damaged solar cells with a continuous wave laser to produce a moderate heating and a large forward-biased current. The InP cells were irradiated with 27 MeV electrons to a given fluence, and tested for degradation. Light from an argon laser was ... |
|
| Non-Invasive NIR Sensor for Quantification of Deep Tissue Oxygenation. Phase 1 |
OCT 1995 |
68 pages |
| Authors:
H. S. Lee; SCIENCE AND ENGINEERING SERVICES INC BURTONSVILLE MD
|
| A breadboard NIR sensor system was developed for the purpose of accurate quantification f deep tissue oxygenation based on a novel Pseudo-Random Modulation/Resolution Enhancement Technique (PRM/RET). It consists of a CW modulated diode laser coupled with optical fiber, a detector, and a sampling oscilloscope. Temporal resolution of 40 psec with a 200 MHZ PRM system is demonstrated, which is 100 fold improvement over the conventional limit of the PRM technique. ... |
|
| Development of 1-2 micrometers Tunable Solid-State Lasers Based on Cr(4+) as a Lasing Ion |
30 SEP 95 |
6 pages |
| Authors:
Robert R. Alfano; CITY UNIV OF NEW YORK
|
| Several laser systems were acquired using the funds under the AFOSR Research Instrumentation Program. The following laser systems were purchased: (1) 20-W continuous-wave mode-locked Antares Nd:YAG laser from Coherent. (2) Cr:forsterite regenerative amplifier, pulse stretcher, and pulse compressor were custom built by Excel/Quantronix. The regenerative amplifier is pumped by a Excel/Quantronix 20-W 1- kHz Q-switched Nd:YAG laser. (3) Four high-brightness 1-W 970-nm Spectra Diode Laser semiconductor diode lasers. jg p1 ... |
|
| Quantum Transistor Circuits. Physics of Semiconductor Light Sources |
21 SEP 95 |
19 pages |
| Authors:
Hyatt M. Gibbs; Galina Khitrova; ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
|
| The earlier research focused on destabilization (appearance of new frequencies, new polarizations, and/or new spatial patterns) and stabilization (locking of frequency, polarization, and pattern) by injecting a narrowband cw laser beam into a VGSEL. A very weak injected beam can have great effects because of cavity (>300) and gain (> 10) enhancements. Not only were clean definitive data taken, but excellent agreement was also obtained between the data and plasma ... |
|
| Quantum Transistor Circuits: |
19 SEP 95 |
18 pages |
| Authors:
Hyatt M. Gibbs; Galina Khitrova; ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
|
| The earlier research focused on destabilization (appearance ofnewfrequencies, new polarizations, and/or new spatial patterns) and stabilization (locking offrequency, polarization, and pattern) by injecting a narrowband cw laser beam into a VCSEL. |
|
| Mathematical Nonlinear Optics |
AUG 95 |
17 pages |
| Authors:
David W. McLaughlin; PRINCETON UNIV NJ DEPT OF MATHEMATICS
|
| The principal investigator, together with a post-doctoral fellows Tetsuji Ueda and Xiao Wang, several graduate students, and colleagues, has applied the modern mathematical theory of nonlinear waves to problems in nonlinear optics and to equations directly relevant to nonlinear optics. Projects included (1) the interaction of laser light with nematic liquid crystals and (2) chaotic, homoclinic, small dispersive, and random behavior of solutions of the nonlinear Schroedinger equation. In project(1) ... |
|
| II-VI/III-V Heterojunctions |
31 JUL 95 |
40 pages |
| Authors:
Robert L. Gunnshor; PURDUE UNIV LAFAYETTE IN SCHOOL OF ELECTRICAL ENGINEERING
|
| Use of the Mg containing quaternary led to a pseudomorphic SCH laser. The graded bandgap ohmic contact reduced threshold voltages to 5 volts as room temperature cw was obtained. TEM studies provided the first reports of compositional modulation in a II-VI alloy. It was found that the quaternary above a certain bandgap exhibited a compositional modulation in a particular direction. Laser degradation has been studied using electroluminescence microscopy and TEM ... |
|
| Modelocking and Waveguide Amplifiers using Cr: Forsterite and Cr: YAG |
JUN 95 |
14 pages |
| Authors:
Clifford R. Pollock; CORNELL UNIV ITHACA NY SCHOOL OF ELECTRICAL ENGINEERING
|
| Solid state laser based on Cr:YAG and Cr:Forsterite have been investigated. Self mode-locking has been achieved in both systems with a limited tuning range io the Cr:YAG system. Nanocrystals of Cr: Forsterite suspended in an index-matching polymer have been produced and spun onto a glass slide. The 1 microns thick layer has produced a significant amount of fluorescent emission but low loss wave guides were impossible to fabricate due to ... |
|
| High Power CO2 Laser Windows and Reflection Reducing Coatings |
10 APR 95 |
18 pages |
| Authors:
G. A. Atanassov; Gu Peifu; NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
|
| This article describes evaluation standards for window materials. In conjunction with that, comparisons were made between the four types of materials Ge, GaAs, ZnSe, and KCl. It was discovered that KCl possesses optimum optical characteristics. In conjunction with this, reflection reducing films associated with good performance were designed and prepared. Measurements were done of their absorption and laser damage threshold values. (AN) ANNOTATION: High Power CO sub 2 Laser Windows ... |
|
| Development of a Novel Wind Lidar. Phase 1 |
08 FEB 95 |
35 pages |
| Authors:
H. S. Lee; SCIENCE AND ENGINEERING SERVICES INC BURTONSVILLE MD
|
| A prototype new incoherent Doppler lidar system was designed for atmospheric wind measurements with a high accuracy up to a 5 kilometer slant path range in Phase 1. This sensor is based on the pseudo-random modulation cw lidar technique in conjunction with a new incoherent Doppler lidar method, in which the return PRM laser signal is passed through a Doppler filter before being digitally processed to determine range resolved wind ... |
|
Reports by Keyword(s)
CONTINUOUS WAVE LASERS
