| Novel Wavelength Standards in the Near IR |
15 APR 2008 |
54 pages |
| Authors:
Kristan L. Corwin; KANSAS STATE UNIV MANHATTAN DEPT OF PHYSICS
|
 | The goal of this work is to develop a new class of portable optical frequency references based on sub-Doppler spectroscopy inside gas- filled hollow-core photonic bandgap optical fiber. This research has three major components, consisting of spectroscopy in hollow fiber, the development of a near-IR optical frequency comb with which to characterize the transitions inside the fiber, and efforts to seal these fibers filled with molecular gases to create portable ... |
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| Novel Designs and Coupling Schemes for Affordable High Energy Laser Modules |
28 SEP 2007 |
74 pages |
| Authors:
Jerome V. Moloney; Axel Schulzgen; Pavel Polynkin; Masud Mansuripur; Mahmoud Fallahi; Yoel Fink; Chiping Chen; ARIZONA UNIV BOARD OF REGENTS TUCSON
|
| This multi-disciplinary research effort developed new classes of compact, highly-doped Er/Yb phosphate-doped glass fibers as high power, low noise single wavelength, single mode oscillators. Three world record powers in low-noise, single frequency laser oscillators at the eyesafe wavelength of 1.55 micrometers were reported. The project vertically integrated fabrication, testing, and optimization of all components necessary for manufacturing of fiber laser units including highly doped specialty glasses, fiber preforms, fiber drawing ... |
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| Injection Characterization of Packaged Bi-Directional Diamond Shaped Ring Laser at 1550 NM |
SEP 2006 |
13 pages |
| Authors:
Rebecca Bussjager; Reinhard Erdmann; Vassillios Kovanis; Brian McKeon; Michael Fanto; Steve Johns; Michael Hayduk; Joseph Osman; Alan Morrow; Malcolm Green; AIR FORCE RESEARCH LAB ROME NY SENSORS DIRECTORATE
|
| The Air Force Research Laboratory. Binoptics Corp. and Infotonics Technology Center worked collaboratively to package and characterize recently developed diode based ring lasers that operate at 1550 nm in a diamond shaped cavity. The laser modes propagate bi-directionally; however. uniaxial propagation may be induced by optical injection or by integrating a mirror. Round trip cavity length was 500 microns in 3.5 microns wide ridge waveguides, and four polarization maintaining lensed ... |
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| Narrow Linewidth Tunable Solid-State Microchip Lasers for Precision Inertial Navigation Systems (PINS) |
11 JAN 2006 |
30 pages |
| Authors:
Franz X. Kaertner; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| In Phase 1 of the PINS program we were able to demonstrate a multimode operating Cr:LiCAF miniaturized laser generating up to 300 mW of output power. In addition we developed a filter that enables tuning over 0.9 nm and single-mode operation. Initial demonstrations with test devices showed single-mode operation up to 20mW of output power with linewidth on the order 5MHz. We are confident, that further development could bring the ... |
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| Optical Materials and Device Fabrication for Chemical Sensing on the Nanoscale |
15 JUL 2005 |
14 pages |
| Authors:
Daniel G. Nocera; Aetna W. Wun; Preston Snee; Becky Somers; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY
|
| The program focus is to create new optical sensors based on bio-inspired concepts and use them for sensing applications of relevance to the United States Air Force, especially for applications in the micro- and nano-domains. This proposal seeks to unite the areas of optical chemo/bio-sensing (CB sensing) and nanoscience. As the advancement of chemical sensing systems progresses towards small length scales, sensitivity and performance are compromised because there are simply ... |
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| Employing Noisy Environments to Support Quantum Information Processing |
14 SEP 2004 |
5 pages |
| Authors:
Martin B. Plenio; Susana F. Huelga; IMPERIAL COLL OF SCIENCE TECHNOLOGY ANDMEDICINE LONDON (UNITED KINGDOM)
|
| In this project we have investigated the use of noise to support the generation of noise and coherent quantum information processing. We have presented schemes to this effect firstly in quantum optical settings (optical cavity QED, ion traps) and then in condensed matter environments (nano- mechanical oscillators and SQUID technologies). Abstract theoretical investigations into the usefulness of noise for quantum information processing have been carried out. The work on this ... |
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| The Fabrication of Self-Assembled Quantum Dot Lasers of InGaAs on Si |
2004 |
30 pages |
| Authors:
Ya-Hong Xie; Bin Shi; Zuo M. Zhao; Jian Liu; Hyung J. Kim; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The authors have made significant progress both in the design and fabrication of Si-based laser device structures. They have demonstrated several key parts of the laser structure, including a SiGe waveguide with good optical and electrical properties for both light and carriers confinement. SiGe resonant cavity with Distributed Bragg Reflectors (DBRs) to serve as Si-based laser cavity was designed and fabricated, which may be the first SiGe-based resonant cavity with ... |
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| Spectral Stabilization of Laser Diodes by External Bragg Resonator |
2004 |
5 pages |
| Authors:
George Venus; Vadim Smirnov; Leonid Glebov; Manoj Kanskar; UNIVERSITY OF CENTRAL FLORIDA ORLANDO SCHOOL OF OPTICS/CREOL
|
| Volume Bragg laser (VOBLA) with feedback produced by a reflective photo-thermo-refractive volume Bragg grating is used for narrowing spectral width and angular divergence of laser diodes. High-efficient, single mode and spectral width of 60 pm at power of 800 mW are demonstrated from 35 and 100 m-stripe laser. The problem of high-brightness, high-efficient semiconductor laser sources with stable narrow emission spectra is important for different kinds of applications. Various constructions ... |
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| 3D Semiconductor Nanocavities |
NOV 2003 |
12 pages |
| Authors:
Galina Khitrova; Dennis Deppe; ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
|
| Nanocavities with a three-dimensional cavity mode confinement have been fabricated and their properties have been explored experimentally. Exhaustive measurements were made of linear and nonlinear transmission and reflectivity, and photoluminescence using cw and femtosecond lasers. The high quality of the oxide-aperture nanocavities containing a single quantum well resulted in a well resolved normal mode coupling and a record splitting-to- linewidth much larger than previously seen for a 3D photonic structure. ... |
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| Proceedings of the 2003 Particle Accelerator Conference. Volume 2 of 5 |
MAY 2003 |
753 pages |
| Authors:
Joe Chew; Peter Lucas; Sara Webber; INSTITUTE OF ELECTRICAL AND ELECTRONICSENGINEERS INC PISCATAWAY NJ
|
| The twentieth biennial Particle Accelerator Conference on Accelerator Science and Technology was held May 12 - 16, 2003 at the Hilton Hotel in Portland, Oregon. The Stanford Linear Accelerator Center and the Lawrence Berkeley National Laboratory organized PAC 2003, and it was held under the auspices of the Nuclear and Plasma Sciences Society of the Institute of Electrical and Electronics Engineers and the Division of Physics of Beams of the ... |
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| Continuously Tunable 3-5 Micrometers Single-Frequency Laser Source |
08 FEB 2003 |
54 pages |
| Authors:
Ramon U. Martinelli; SARNOFF CORP PRINCETON NJ
|
| The goal of this project is to develop a 3-5 micrometer continuously tunable single-frequency laser source. Our approach uses an external cavity (EC) and various tuning elements in conjunction with a semiconductor optical amplifier (SOA). Optically pumped, amorphous-silicon ridge-waveguide lasers, grown via molecular-beam epitaxy, were developed that could function as curved- ridge-waveguide SOAs. The lasers operate at a temperature of 295 K, where they output 7 mW per facet. The ... |
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| Nanotechnology Instrumentation |
FEB 2003 |
9 pages |
| Authors:
Hyatt M. Gibbs; Galina Khitrova; ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
|
| Various instruments have been purchased and tested that extend existing nanotechnology capabilities and complement existing equipment. The fact that these laboratories have worked for several years on 3D microcavities and micron-size spectroscopic measurements clarified the need for several complementary instruments. The major new thrust made possible by this grant is spectroscopic capability at 1300 nm. A CCD camera system provides very sensitive detection from 800 to 1600 nm. The existing ... |
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| Megawatt Class Free Electron Lasers for Naval Application - Short Rayleigh Length and Stability Analysis |
DEC 2002 |
125 pages |
| Authors:
William J. Ossenfort Jr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The free electron laser (FEL) is theoretically capable of scaling up to a MW class laser for naval point defense. At such high power levels, the FEL's optics could be damaged. An FEL operating with a short Rayleigh length reduces intensity at the mirrors; however, the performance of short Rayleigh length FELs is unknown. This thesis presents simulations of Thomas Jefferson Laboratories' proposed 100 kW FEL operating with a short ... |
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| Simulations of a Short Rayleigh Length 100 kW FEL and Mirror Stability Analysis |
DEC 2002 |
101 pages |
| Authors:
Thomas E. Campbell; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A MW class free electron laser capable of delivering energy at the speed of light can improve ASCM defensive capability for Navy ships. Many design challenges must be overcome to make such a weapon possible. One such challenge is to maintain the power density on laser cavity mirrors at acceptable levels. The use of a short Rayleigh length to increase beam spot size at the mirror is studied as a ... |
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| Self-Starting Solid-State Laser with Dynamic Self-Adaptive Cavity |
04 OCT 2002 |
31 pages |
| Authors:
Oleg Antipov; RUSSIAN ACADEMY OF SCIENCES NIZHNY NOVGOROD (RUSSIA) INST OF APPLIED PHYSICS
|
| This report results from a contract tasking Institute of Applied Physics as follows: The present project is directed at the development of physical principles of creation of solid-state lasers of a new class with cavity completed by dynamic holographic gratings induced in nonlinear medium by generating beam itself. The self-starting laser oscillator based on Nd:YAG laser crystals with cavity formed with participation of refractive-index and gain gratings accompanied by population ... |
|
| Computational Issues in Analysis and Design of Chemical-Laser Flow- Fields |
30 SEP 2002 |
62 pages |
| Authors:
W. M. Eppard; Eugene M. Cliff; AEROSOFT INC BLACKSBURG VA
|
| In support of the Air Force's airborne laser (ABL) development program. state-of-the-art CFD analysis and design methods have been extended to include the physical models important in chemical oxygen-iodine laser (COIL) systems. The three-dimensional COIL simulation model is based on the CFD flow solver GASP v4 which solves the conservative, finite-volume formulation of the Navier-Stokes equations with general thermo-chemistry. The COIL design software is based on the continuous sensitivity equation ... |
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| Nonlinear Guided Waves and their Applications. Technical Digest |
04 SEP 2002 |
|
| Authors:
OPTICAL SOCIETY OF AMERICA WASHINGTON DC
|
 | The OSA topical meetings that received support under this grant provided a forum for researchers in various specialty areas to meet and share ideas and technology in their fields. This Technical Digest contains the meeting agenda and technical papers from the Nonlinear Guided Waves and Their Applications Meeting. This report emphasizes techniques in the areas of materials, fabrication, devices, applications and non linear theory. |
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| Pulsed COIL with Volume Generation of Iodine Atoms in Electric Discharge |
17 JUL 2002 |
9 pages |
| Authors:
Nikolai N. Yuryshev; Nikolai P. Vagin; Aleksei F. Konoshenko; Vladimir S. Paziuk; LEBEDEV PHYSICS INST MOSCOW (RUSSIA)
|
| The method of volume generation of iodine atoms to obtain the pulsed mode of COIL is the most effective by the ratio of pulsed power to cw one at the same flowrate of chemicals. The electric discharge is a very convenient tool to produce iodine atoms in an active medium. The electrical efficiency close to 100% was obtained when longitudinal glow discharge was used. The investigation of both influence of ... |
|
| A Review of Recent Experiments and Calculations Relevant to the Kinetics of the HF Laser |
17 JUL 2002 |
17 pages |
| Authors:
Gerald C. Manke II; Gordon D. Hager; AIR FORCE RESEARCH LAB KIRTLAND AFB NMDIRECTED ENERGY DIRECTORATE
|
| An abbreviated review of rate coefficients relevant to HF laser kinetics modeling is presented. The literature has been surveyed from the last published review in 1983 to the present. Updated HF Einstein emission coefficients are tabulated. This brief summary of a more detailed review addresses rate coefficients relevant to HF generation, reactive quenching, self-relaxation, and vibrational relaxation by a selection of atoms and molecules. In addition, a review of recent ... |
|
| History of COIL Development in Japan: 1982-2002 |
17 JUL 2002 |
12 pages |
| Authors:
Masamori Endo; Taro Uchiyama; Kenzo Nanri; Shuzaburo Takeda; Tomoo Fujioka; TOKAI UNIV HIRATSUKA (JAPAN) DEPT OF PHYSICS
|
| A twenty-years of COIL researches and developments in Japan are reviewed. The researches of four major sites, namely, Keio University, Industrial Research Institute, Kawasaki Heavy Industries and Tokai University are presented in order of time. Epoch-making works are highlighted, and the significance of those works in the industrial COIL development is discussed. Finally, current status of COIL researches in Japan is introduced. |
|
| Modeling of the Gain, Temperature, and Iodine Dissociation Fraction in a Supersonic Chemical Oxygen-Iodine Laser |
17 JUL 2002 |
12 pages |
| Authors:
B. D. Barmashenko; E. Bruins; D. Furman; V. Rybalkin; S. Rosenwaks; BEN-GURION UNIV OF THE NEGEV BEERSHEBA (ISRAEL) DEPT OF PHYSICS
|
| We report on a simple one-dimensional model developed for the fluid dynamics and chemical kinetics in the chemical oxygen iodine laser (COIL). Two different I2 dissociation mechanisms are tested against the performance of a COIL device in our laboratory. The two dissociation mechanisms chosen are the celebrated mechanism of Heidner and the newly suggested mechanism of Heaven. The gain calculated using Heaven's dissociation mechanism is much lower than the measured ... |
|
| German COIL Efforts: Status and Perspectives |
17 JUL 2002 |
7 pages |
| Authors:
Willy L. Bohn; GERMAN AEROSPACE CENTER (DLR) STUTTGART(GERMANY) INST OF TECHNICAL PHYSICS
|
| Historically, COIL research in Germany has started with microwave excitation of an oxygen flow. But soon all efforts have been devoted to the chemical generation of excited singlet oxygen and have eventually given rise to a supersonic 10 kW class rotating disk driven device. A diode based diagnostic provides data of small signal gain and cavity temperature which emphasize the role of iodine injection for different penetration conditions. Heat release ... |
|
| Gain and Temperature in a Slit Nozzle Supersonic Chemical Oxygen-Iodine Laser with Transonic and Supersonic Injection of Iodine |
17 JUL 2002 |
11 pages |
| Authors:
S. Rosenwaks; B. D. Barmashenko; E. Bruins; D. Furman; V. Rybalkin; BEN-GURION UNIV OF THE NEGEV BEERSHEBA (ISRAEL) DEPT OF PHYSICS
|
| Spatial distributions of the gain and temperature across the flow were studied for transonic and supersonic schemes of the iodine injection in a slit nozzle supersonic chemical oxygen-iodine laser as a function of the iodine and secondary nitrogen flow rate, jet penetration parameter and gas pumping rate. The mixing efficiency for supersonic injection of iodine (^ 0.85) is found to be much larger than for transonic injection (^ 0.5), the ... |
|
| Cavity Ring-Down Spectrometer for the Absorption Measurements of Molecular Ions |
21 MAY 2002 |
9 pages |
| Authors:
Richard N. Zare; STANFORD UNIV CA DEPT OF CHEMISTRY
|
| The goal of this project was to develop an ion spectrometer capable of making absorption measurements on ions using cavity ring-down spectroscopy (CRDS). As part of our continuing goal of detecting ion products from ion- molecule reactions, we have successfully used CRDS to measure the vibronic absorption spectra of various small ions and radicals generated by a pulsed discharge nozzle. These spectra give information about the number densities and temperatures ... |
|
| Gas and Chemical Lasers and Intense Beam Applications III Held in San Jose, CA, USA on 22-24 January 2002 |
24 JAN 2002 |
314 pages |
| Authors:
Michael C. Heaven; Steven J. Davis; SPIE-THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING BELLINGHAM WA
|
| This proceedings contains papers on the following topics: Oxygen- Iodine Chemical Lasers; other chemical lasers; laser systems, modeling and interactions; COIL technology development. |
|
| Fiber Laser Array |
JAN 2002 |
56 pages |
| Authors:
Thomas B. Simpson; JAYCOR SAN DIEGO CA
|
| Investigations of the coherent combining of fiber lasers using intracavity coupling have focused on the use of the Talbot effect, an external master oscillator, and the use of coherent coupling to create nonlinear, i.e., field-dependent, loss within the coupled laser array. During this program, Jaycor focused on the construction and use of an experimental apparatus that can be used to investigate the coherent combination of an array of fiber lasers. ... |
|
| Integrated Transmitters and Long-Wavelength VCSELs |
11 OCT 2001 |
9 pages |
| Authors:
Pallab Bhattacharya; MICHIGAN UNIV ANN ARBOR SOLID-STATE ELECTRONICS LAB
|
| The objective of this program is to develop InP-based monolithically integrated transmitters, including internal (current) and external modulation. The basic issues involved in such integration and operation of the individual devices will be explored both theoretically and experimentally. Thus, intrinsic and extrinsic factors that limit internal and external modulation, propagation and scattering of light in guided structures and through mirrors, and circuits, materials and lithography issues to develop high-frequency (>30 ... |
|
| Thermodynamic Analysis of MBE Growth of Quarternary InGaAsN Compounds |
JUN 2001 |
3 pages |
| Authors:
V. A. Odnoblyudov; A. Yu. Egorov; A. R. Kovsh; A. E. Zhukov; N. A. Maleev; RUSSIAN ACADEMY OF SCIENCES SAINT PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
|
| LNGaAsN has recently been proposed as a novel material for near-infrared lasers. The merits of this material are due to the strong bowing in the bandgap of the GaAs-GaN alloy system which offers the extension of the light emission range from GaAs-based structures to 1.3 micrometers and longer. At the same time the band-offsets between InGaAsN and GaAs are larger than in the conventionally used InGaAsP system which should greatly ... |
|
| Nanostructures: Physics and Technology |
JUN 2001 |
634 pages |
| Authors:
RUSSIAN ACADEMY OF SCIENCES ST PETERSBURG IOFFE PHYSICAL- TECHNICAL INST
|
| The Proceedings of the 9th International Symposium on Nanostructures: Physics and Technology (NANO200l) held in St. Petersburg, Russia on June 18-22 2001 contains papers on the following topics: Nanostructure technology, Silicon based nanostructures, Infrared phenomena in nanostructures, Wide band gap nanostructures, Microcavity and photonic crystal, Nanostructure characterization and novel atomic-scale probing techniques, Quantum wells and superlattices, Quantum wires and quantum dots, Tunneling phenomena, General properties of low dimensional structures, Spin ... |
|
| Binary Super Grating (BSG) Self-Collimated Multi-Wavelength Laser |
22 FEB 2001 |
8 pages |
| Authors:
Martin Fay; J. M. Xu; BROWN UNIV PROVIDENCE RI DIV OF ENGINEERING
|
| This project concerns the exploration of two novel and enabling technologies: a self-collimated multi-wavelength laser (SCMWL). and the underlying binary supergrating (BSG). on which the SCMWL depends. In this context, the BSG functions as a multi-wavelength reflector which can be implemented by a simple two-level etching process. The SCMWL makes use of BSGs to form a planar cavity with collimated multi-wavelength resonances, when combined with gain, the result is self-collimated ... |
|
| Dispersion and Nonlinearity Characterization of a Mode-Locked Erbium- Doped Fiber Laser |
FEB 2001 |
33 pages |
| Authors:
James A. Louthain; Michael J. Hayduk; AIR FORCE RESEARCH LAB ROME NY SENSORSDIRECTORATE
|
| This report describes the results of dispersion and nonlinearity experiments of the components required for the development of picosecond passively mode-locked fiber lasers. First, we will summarize the interferometric dispersion measurement technique and results for short lengths of fiber (< 1 meter). We measured dispersion of standard fiber at 16.9 +/- 1.4 ps/nm and Er- doped fiber at 8.5 +/- 1.6 ps/nm at 1550 nm. Next, we measured the group ... |
|
| Nanostructures: Physics and Technology. Annual International Symposium Held in St. Petersburg, Russia; Nano2001 (CD-ROM) |
2001 |
|
| Authors:
RUSSIAN ACADEMY OF SCIENCES ST PETERSBURG IOFFE PHYSICAL-TECHNICAL INST
|
| ELECTRONIC FILE CHARACTERISTICS: 68 text, hypertext, image, audio and software files; Adobe PDF, HTML, JPG, GIF, and WAV. PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 99.1 MB. SYSTEMS DETAIL NOTE: MS WIndows 98/2K/ME/NT-compatible; requires Adobe Acrobat Reader (on disc). ABSTRACT: The International symposium "Nanostructures: Physics and Technology" was initiated by Prof. Zhores Alfero and Prof. Leo Esaki in 1993 and has been run annually under the ... |
|
| Two-Dimensional Bragg Microcavity Lasers |
30 DEC 2000 |
5 pages |
| Authors:
Dennis G. Hall; ROCHESTER UNIV NY INST OF OPTICS
|
| This Augmentation Award for Science and Engineering Research Training (AASERT) program supported the research of one graduate student (Pamela Greene) to carry out fundamental investigations of semiconductor lasers that make use of circular, two-dimensional Bragg gratings to define novel semiconductor laser microresonators. Such a laser can be described as a circularly symmetric, surface- emitting, distributed-feedback (DFB) semiconductor laser. Under ideal conditions, the spatial mode of the laser (within the waveguide) ... |
|
| Research Instrumentation for Photonic Bandgap Photonics |
27 NOV 2000 |
11 pages |
| Authors:
John O'Brien; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES
|
| This program funded the purchase of a Sun Ultra 60 dual processor workstation and tunable laser modules from New Focus that complement our existing tunable diode laser and extend the tuning range from 1470 nm to 1620 nm. These were, and continue to be, used in our work on photonic crystal devices. In particular, the workstation has been used to calculate modes for the design of a single defect microcavity ... |
|
| Integrated Transmitters and Long-Wavelength VCSELs |
02 NOV 2000 |
4 pages |
| Authors:
Pallab Bhattacharya; MICHIGAN UNIV ANN ARBOR SOLID-STATE ELECTRONICS LAB
|
| The objective of this program is to develop InP-based monolithically integrated transmitters, including internal (current) and external modulation. The basic issues involved in such integration and operation of the individual devices will be explored both theoretically and experimentally. Thus intrinsic and extrinsic factors that limit internal and external modulation, propagation and scattering of light in guided structures and through mirrors, and circuits, materials and ... |
|
| Very-Narrow-Line Semiconductor Laser and Optical Clocks Based on Spectral Hole Burning Frequency Standards |
12 OCT 2000 |
24 pages |
| Authors:
Rufus L. Cone; MONTANA STATE UNIV BOZEMAN DEPT OF PHYSICS
|
| Single-frequency diode lasers were stabilized to 500Hz precision at 1.5 microns and to 20Hz at 793nm on 10-ms time scales using narrow spectral holes in absorption lines of Er and Tm doped cryogenic crystals as frequency references and without vibrational isolation of either the laser or frequency reference. Kilohertz stability for 100 seconds is provided by these techniques, and that performance is extendable to longer time scales with further development. ... |
|
| MOCVD Upgrade |
21 SEP 2000 |
14 pages |
| Authors:
Julian Cheng; NEW MEXICO UNIV ALBUQUERQUE CENTER FORHIGH TECHNOLOGY MATERIALS
|
| The goal of this research program is to develop a novel technology for the epitaxial growth and fabrication of vertical-cavity surface-emitting laser structures with lasing wavelengths in the 110 nm to 1500 nm regime, with special emphasis on the 1300 nm VCSEL's and monolithic VCSEL arrays These are useful for the parallel optical data links that will interconnect future computer networks, whose nodes may be ... |
|
| Center for Non-Stoichiometric Semiconductors |
SEP 2000 |
68 pages |
| Authors:
Umesh K. Mishra; CALIFORNIA UNIV SANTA BARBARA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Research under the PRET program has covered a varied range of materials and device applications. Early work was directed mostly toward understanding and implementing low-temperature grown (LTG) GaAs into field- effect transistors (FETs) providing increased breakdown voltages and a reduced noise performance. In recent years the research has been redirected into the newly emerging area of oxides and oxide electronics. Oxide produced from the ... |
|
| Novel Electric-Field Effects in Quantum Wells, Superlattices, and Microcavities |
30 JUN 2000 |
10 pages |
| Authors:
Emilio E. Mendez; STATE UNIV OF NEW YORK AT STONY BROOK
|
| We have used an external electric field to control important properties of semiconductor quantum wells. Specifically: (1) We have modified the exciton-exciton interaction. This interaction is determined by many-body effects, which depend on the overlap between the exciton's electron and hole wavefunctions, and is manifested in the energy difference between photoluminescence spectra with different polarizations. In time-resolved photoluminescence (PL) experiments with circular polarization ... |
|
| High Average Power Solid-State Laser With Dynamic Self-Adaptive Cavity |
09 JUN 2000 |
25 pages |
| Authors:
Oleg Antipov; RUSSIAN ACADEMY OF SCIENCES NIZHNY NOVGOROD (RUSSIA) INST OF APPLIED PHYSICS
|
| This report results from a contract tasking Institute of Applied Physics of the RAS as follows: The contractor will investigate the applicability of using a self-adaptive cavity for generation of Nd:YAG laser beams with average power approaching 500W and with near-diffraction limited spatial quality and good pointing stability. |
|
| Computational Issues in Analysis and Design of Chemical-Laser Flow-Fields (CD-ROM) |
08 MAY 2000 |
|
| Authors:
W. M. Eppard; Eugene M. Cliff; AEROSOFT INC BLACKSBURG VA
|
| ELECTRONIC FILE CHARACTERISTICS: 1 file; Adobe Acrobat v.3.0 PDF; col. ill. PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 818KB. SYSTEMS DETAIL NOTE: IBM-clone PC-compatible; requires CD-ROM drive. ABSTRACT: The Phase-I COIL effort has focused on extending AeroSoft's GASP and SENSE software for COIL-laser analysis and design. Important improvements include: modifications to the species diffusion model to account for effective diffusion coefficients and pressure-driven diffusion effects, modifications ... |
|
| Ultrashort-Pulse Fiber Laser with a Dispersion-Managed Cavity |
05 MAY 2000 |
42 pages |
| Authors:
Thomas F. Carruthers; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The ultrashort fiber laser with a dispersion-managed cavity. The laser is an actively mode-locked sigma laser, typically locked at a repetition rate of 10 GHz, driven by an external frequency source and actively length stabilized, and nearly 10,000 pulses circulate within the laser cavity. A Mach-Zehnder modulator is placed in a loop of polarization-maintaining (PM) fiber. The polarization state of light injected into the non-PM branch evolves in a random ... |
|
| AASERT 95 (BMDO) Routing of Optical Data via Spatial-Spectral Holographic Devices |
25 APR 2000 |
10 pages |
| Authors:
Thomas W. Mossberg; OREGON UNIV EUGENE
|
| This ASSERT award provided funds necessary to incorporate additional student resource into a primary AFOSR-sponsored research program. During the funding interval, the first laboratory demonstration of swept-carrier frequency- selective optical memory was realized. Additional results include the development of a frequency-agile narrow linewidth external cavity diode laser and a recently-patented laser-frequency-stabilization method that is compatible with extreme frequency-agility. |
|
| Spatial-Spectral Holographic Approaches to the Storage, Processing, and Manipulation of Optical Data Streams |
01 MAR 2000 |
9 pages |
| Authors:
Thomas W. Mossberg; OREGON UNIV EUGENE
|
| The results of a comprehensive study of optical interactions with frequency-selective recording materials are reported along with ancillary results related to high-speed tuning and reference-free stabilization of associated lasers. Frequency-selective recording materials provide the physical basis for time-space or 4D holography wherein the full spatial and temporal information contained in an optical signal can be stored and/or processed. It is shown that 4D holographic recall ... |
|
| Spatial-Spectral Holographic Approaches to the Storage, Processing, and Manipulation of Optical Data Streams |
01 MAR 2000 |
9 pages |
| Authors:
Thomas W. Mossberg; OREGON UNIV EUGENE
|
| The results of a comprehensive study of optical interactions with frequency-selective recording materials are reported along with ancillary results related to high-speed tuning and reference-free stabilization of associated lasers. Frequency-selective recording materials provide the physical basis for time-space or 4D holography wherein the full spatial and temporal information contained in an optical signal can be stored and/or processed. It is shown that 4D holographic recall signals can be substantially stronger ... |
|
| Computational Issues in Analysis and Design of Chemical-Laser FLow- Fields |
31 DEC 1999 |
32 pages |
| Authors:
W. M. Eppard; Eugene Cliff; AEROSOFT INC BLACKSBURG VA
|
| The Phase-I COIL effort has focused on extending AeroSoft's GASP and SENSE software for COIL-laser analysis and design. Important improvements include: modifications to the species diffusion model to account for effective diffusion coefficients and pressure-driven diffusion effects, modifications to account for laser power extraction, the addition of a COIL chemistry model, and the development of a strategy for implementing a coupled flow-solver/power- extraction sensitivity ... |
|
| Vertical Cavity Lasers for Atomic Time Standards |
Dec-1999 |
8 pages |
| Authors:
Hans P Zappe; CENTRE SUISSE D'ELECTRONIQUE ET DE MICROTECHNIQUE ZURICH (SWITZERLAND)
|
| The availability of Vertical Cavity Lasers (VCSELs) has allowed the development of new generations of optical systems, which can benefit from the small size, low power consumption, and high reliability of these light sources. Among diode laser families, VCSELs are particularly attractive for a number of reasons: (I) relatively simple and robust fabrication; (2) very low threshold current and, thus, low power consumption; (3) surface emission, thus simplified packaging and ... |
|
| Advanced Semiconductor Lasers and Their Applications. Volume XXXI |
NOV 1999 |
225 pages |
| Authors:
Leo Hollberg; Robert J. Lang; OPTICAL SOCIETY OF AMERICA WASHINGTON DC
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| 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 ... |
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| Dispersion Management in a Harmonically Mode-Locked Fiber Soliton Laser |
31 OCT 1999 |
4 pages |
| Authors:
Thomas F. Carruthers; III Duling Irl N.; Moshe Horowitz; Curtis R. Menyuk; NAVAL RESEARCH LAB WASHINGTON DC OPTICAL SCIENCES DIV
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| Harmonically mode-locked Er-fiber soliton lasers have become a reliable source of high-repetition-rate picosecond pulses in high-speed communications and photonic analog-to-digital conversion systems because of their low-noise, dropout-free operation. We have fabricated such a laser with a strongly dispersion-managed cavity and modeled its operation, and we have found that dispersion management significantly extends the power range over which uninterrupted single-pulse production is attained and dramatically decreases the effects of amplified spontaneous ... |
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| Binary Super Grating (BSG) Self-Collimated Multi-Wavelength Laser |
30 SEP 1999 |
6 pages |
| Authors:
J. M. Xu; Martin F. Fay; TORONTO UNIV (ONTARIO) DEPT OF ELECTRICAL ENGINEERING
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| This project concerns the exploration of two novel and enabling technologies: a self-collimated multi-wavelength laser (SCMWL), and the underlying binary superimposed grating (BSG), on which the SCMWL depends. The BSG is a multi-wavelength reflector which can be implemented by a convenient two-level etching process. The SCMWL makes use of BSGs to form a planar cavity with collimated multi-wavelength resonances. When combined with gain, the result is self-collimated multi-wavelength output. We ... |
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