| A Laser-Based Sensor for Ambient Detection of RDX and TNT |
Dec-2008 |
6 pages |
| Authors:
Stephen D Roberson; Rosario C Sausa; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
 | We detect trace residues of RDX and TNT by surface photofragmentation - fragment detection in real time at ambient conditions. An infrared or visible laser generates signature, NO molecular fragments, and a second, low energy, ultraviolet laser facilitates their detection by resonance enhanced multiphoton ionization. We present the effects of pump laser wavelength, laser energy, delay timing between the pump and probe beams, and analyze concentration on signal intensity. Sensitivity ... |
|
| High Al-content AlGaN Alloys for Deep UV Laser Applications |
16-Jun-2008 |
10 pages |
| Authors:
Hongxing Jiang; Jingyu Lin; KANSAS STATE UNIV MANHATTAN
|
| We have carried out the growth and systematic studies of the optoelectronic and structural properties of AlN epilayers. The results revealed that the threading dislocation (TD) density, in particular the edge TD density, decreases considerably with increasing the epilayer thickness. The screw dislocation density was estimated to be about 5x106 cm-2 in the 4 ?m thick AlN epilaye and is more than one order of magnitude lower than that in ... |
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| Advanced Laser and RF Plasma Sources and Diagnostics |
13-Jun-2007 |
19 pages |
| Authors:
John E Scharer; WISCONSIN UNIV-MADISON DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| We have purchased and have running state-of-the-art equipment that enhances our research capabilities for efficient laser initiation and radiofrequency sustainment of plasmas and diagnostics in air, as well as near microwave windows and on cathode surfaces as part of the MURI on Nano-physics of Electron Emission and Breakdown for High Power Microwaves. |
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| A Laser-Based Explosives Sensor |
NOV 2006 |
6 pages |
| Authors:
ROSARIO C. SAUSA; Jerry Cabalo; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Trace explosives residues of CL20 (hexanitrohexazaisowurtzitane) and RDX (hexahydro-1,3,5-hexanitro-1,3,5-triazine) are measured in real-time by surface laser photofragmentation-fragment detection (SPFFD) spectroscopy at ambient conditions. A 248-nm laser photofragments the target residue on a substrate, and a 226-nm laser ionizes the resulting NO fragment by resonance-enhanced multiphoton ionization by means of its A-X (0,0) transitions near 226 nm. We investigate the effects of laser wavelength and energy, delay between photofragmentation and ionization ... |
|
| Cooperative Agreement between Lehigh University and the Army Research Laboratory to Support Research into Electronics |
10 DEC 2004 |
12 pages |
| Authors:
Rick Vinci; Jim Hwang; Miltos Hatalis; Himanshu Jain; Yujie Ding; LEHIGH UNIV BETHLEHEM PA
|
| The final results and status of the 9 projects that were previously reviewed during a face-to-face meeting on 15 November 2004 in Adelphi, Maryland, are attached to this cover sheet. The projects are as follows: Characterization of AlGaN Active Regions; Integration of Laser Drivers with VCSEL Arrays-Phase II; Development of Hard Photoresist Masks Using Photoinduced Compositional Changes; Robust Micro-Electro-Mechanical-Systems (MEMS); InAs/GaSb Type-II Super Lattices: Nonlinear Optical Effects; HgCdTe on Si ... |
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| Imaging Transport: Optical Measurements of Diffusion and Drift in Semiconductor Materials and Devices |
SEP 2004 |
61 pages |
| Authors:
Will Freeman; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Knowledge of transport parameters is important to the development of new optoelectronic materials and devices, such as ultraviolet (UV) semiconductor lasers and advanced solar cells. A series of experiments was performed to measure fundamental transport parameters in luminescent semiconductor materials. Using a technique that couples a scanning electron microscope (SEM) in spot mode with a charge coupled display (CCD) camera, it is possible to image the recombination of charge created ... |
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| VLBI Studies of Circumstellar Masers |
AUG 2004 |
33 pages |
| Authors:
Dave Boboltz; NAVAL OBSERVATORY WASHINGTON DC
|
| Briefing charts from presentation on current research and future development of circumstellar masers for use in high-resolution astronomy. |
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| Long-Lived, Energetic States of Small Molecules: Spectroscopy, Pattern Recognition, and Formation/Destruction Mechanisms |
30 JUN 2004 |
17 pages |
| Authors:
Robert W. Field; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMISTRY
|
| The formation, deactivation, and detection mechanisms of atoms and molecules in metastable electronically excited states are, in general, ill characterized. Yet the chemical and photophysical properties of such states are relevant to Air Force Missions in communication, upper atmosphere modeling, and high-speed vehicle tracking, and identification. The capabilities of a multispectral molecular beam apparatus have been demonstrated on the electronic spectrum of acetylene in the energy region of the first ... |
|
| Laser Direct-Write of Alkaline Microbatteries |
19 NOV 2003 |
8 pages |
| Authors:
Craig B. Arnold; Alberto Pique; NAVAL RESEARCH LAB WASHINGTON DC MATERIAL SCIENCE AND TECHNOLOGY DIV
|
| We are developing a laser engineering approach to fabricate and optimize various types of alkaline microbatteries. Microbattery cells are produced using a laser forward transfer process that is compatible with the materials required to make the anode, cathode, separator and current collectors. The use of an ultraviolet transfer laser (wavelength = 355 nm, 30 ns FWHM) enables other operations such as surface processing, trimming and micromachining of the transferred materials ... |
|
| P-N Junction Diode Ultra-Violet Lasers with Directional Emission from Non-Circular Optical Cavities for Bio Sensing |
NOV 2003 |
7 pages |
| Authors:
Richard K. Chang; YALE UNIV NEW HAVEN CT DEPT OF APPLIEDPHYSICS
|
| The objectives of the past 12 months has been directed toward greater understanding of the laser emission from the spiral structure and achieving for the first time, electrically pumped spiral micro-lasers. Another objective was to develop micro-amplifiers which could increase the output emission. During the October 2002 site visit of Lt. Col. John Carrano of DARPA and program manager of the SUVOS program, it became apparent that the low scale ... |
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| Fabrication of Mesoscale Energy Storage Systems by Laser Direct-Write |
APR 2003 |
13 pages |
| Authors:
Craig B. Arnold; Ryan C. Wartena; Karen E. Swider-Lyons; Alberto Pique; NAVAL RESEARCH LAB WASHINGTON DC
|
| Over the last two decades, there has been a trend towards the development of smaller and more autonomous electronic devices, yet the question of how to power these microdevices with correspondingly small power sources remains. To address this problem, we employ a laser forward-transfer process in combination with ultraviolet laser micromachining, to fabricate mesoscale electrochemical power sources, such as microbatteries and micro-ultracapacitors. This direct-write laser-engineering approach enables the deposition of ... |
|
| Photonic Band Gap Devices for Commercial Applications |
26 MAR 2003 |
|
| Authors:
Gregory P. Behrmann; Ahmed Sharkawy; Thomas Dillon; Dennis Prather; David Pustai; EM PHOTONICS INC NEWARK DE
|
 | The objective of this STTR program was to define and develop a unified manufacturing process for Photonic Band Gap (PBG) devices that combine design, simulation, fabrication, and testing. To this end the authors set out to combine the fabrication processes at the University of Delaware with the design and modeling tools of EM Photonics, Inc. to implement and demonstrate applications defined by AFRL researchers. Thus, by investigating devices that serve ... |
|
| Elastin: A Stimuli Responsive Biopolymer for Nano-, and Micro-Actuation |
NOV 2002 |
9 pages |
| Authors:
Gabriel P. Lopez; Venkata R. Goparaju; Qiang Fu; S. Balamurugan; S. Mendez; NEW MEXICO UNIV ALBUQUERQUE DEPT OF CHEMICAL AND NUCLEAR ENGINEERING
|
| We developed hybrid materials comprising of silica and stimuli responsive polymers (SRPs) to demonstrate the feasibility of SRPs as actuation elements in functional nanostructured materials. We successfully demonstrated that the hybrid membranes comprising of silica and SRPs can function as molecular filters with reversible permeability and good stability. We dispersed these SRPs in a slilica matrix at a molecular level using sol-gel process. The encapsulated SRP molecules to act as ... |
|
| Real-Time Fuel Vapor Detector |
01 JUL 2002 |
54 pages |
| Authors:
Greg Gillespie; DAKOTA TECHNOLOGIES INC FARGO ND
|
| Report describes a resonance enhanced multiphoton ionization (REMPI) technique to measure vapor leakage from fuel tanks. The technique is a nonlinear optical process where two photons are simultaneously absorbed by an analyte resulting in the ejection of an electron to form a positively charged parent ion. Leak detector is comprised of three major components: a pulsed UV laser, an ionization cell, and electronics to convert the generated ion current to ... |
|
| Unconventional Laser Guide Stars and Wavefront Correction of Blue Starlight |
28 MAY 2002 |
10 pages |
| Authors:
Robert W. Hellwarth; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
| In this project we established by theory and experiment (1) that a 1/ 4 Joule, 20 ns, ultraviolet laser pulse could create (near 20 km altitude) a return signal to the transmitting telescope that would appear, for 20 ns, to have a brightness temperature of millions of degrees, and thus serve as a guide star for high-order corrections of blue starlight, (2) that a much lower energy (approx. one hundred ... |
|
| Long-Lived, Energetic States of Small Molecules: Spectroscopy, Pattern Recognition, and Formation/Destruction Mechanisms |
FEB 2002 |
|
| Authors:
Robert W. Field; Robert J. Silbey; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| Metastable, electronically excited states of atoms and small molecules have chemical and photophysical properties that are relevant to Air Force missions in communication, upper atmospheric modeling, and high speed vehicle detection; tracking, and identification A second-generation supersonic molecular beam apparatus with optimized multispectral capabilities has been designed, constructed, and tested. A series of experiments on acetylene has defined the fundamental mechanisms of three complementary signal channels: UV- LIF (Ultraviolet Laser ... |
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| The Mechanism and Dynamics of Explosive Combustion in Aerosol Fuels |
NOV 2001 |
5 pages |
| Authors:
Roger Miller; Tomas Baer; NORTH CAROLINA UNIV AT CHAPEL HILL DEPTOF CHEMISTRY
|
| Our initial experiments explored the mechanism of vaporization/ ionization in liquid and nitrobenzene aerosols using CO2 laser evaporation and 193 run excimer laser ionization. Those experiments were critical in characterizing the capabilities of our apparatus and in laying the framework for the behavior of non-reactive species in our two-laser design. The use of multi- photon ionization schemes with the excimer laser resulted in highly fragmented mass spectra, making the identification ... |
|
| Laser Initiated Decomposition in Aerosol Fuels: A Method for Probing the Early Stages of Ignition and Detonation |
SEP 2001 |
6 pages |
| Authors:
Roger E. Miller; Tomas Baer; NORTH CAROLINA UNIV AT CHAPEL HILL DEPTOF CHEMISTRY
|
| The DURIP grant has been used to purchase two new infra-red laser systems that have been used to initiate combustion of energetic aerosol particles. One is a CO2 laser capable of delivering up to 1.5 J of pulsed power, while the other is an OPO laser pumped by an existing Nd:YAG laser to provide tunable radiation in the 2.7 to 3.3 micrometers range. These lasers have been used to help ... |
|
| Advanced Diagnostics for Reacting Flows |
19 JUN 2001 |
4 pages |
| Authors:
Ronald K. Hanson; STANFORD UNIV CA HIGH TEMPERATURE GASDYNAMICS LAB
|
| The goal of this research is to develop advanced laser-based techniques for non-intrusive measurements relevant to air-breathing combustion. In general, the program emphasizes spectrally-resolved absorption using tunable laser sources and planar laser-induced fluorescence (PLIF), conducted using either near-infrared or ultraviolet laser sources. Detailed below is progress on the exploration of IR PLIF as a diagnostic for imaging IR-active gases and on the suitability of pentanone as an alternative flow tracer ... |
|
| Tunable Ultraviolet and Infrared Laser Source for Student Lidar Experiments |
01 OCT 2000 |
30 pages |
| Authors:
Thomas H. Chyba; HAMPTON UNIV VA DEPT OF PHYSICS
|
| A tunable UV and IR laser source was purchased through this grant utilized in lidar experiments and evaluated for potential DoD applications. The laser technology was incorporated into the Hampton University(HU) ozone differential absorption lidar system and lidar measurements of ozone were made. This same technology approach was utilized in the design of the laser for the HU scanning eyesafe aerosol lidar system. This effort resulted in a second research ... |
|
| Joint Services Electronics Program |
20 SEP 2000 |
16 pages |
| Authors:
Jeffrey Bokor; CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB
|
| This is the final technical report for the Berkeley JSEP, Program. As of July 31, 1998, all of the work units in the program were terminated except for one - "Quantum Computation: Exploring a Novel Computational Paradigm" which is led by Prof. Umesh Vazirani. In this final report, a summary description of each of those work units that terminated in 1998 is given, as well as an up to date ... |
|
| XIII International Symposium on Gas Flow and Chemical Lasers and High- Power Laser Conference |
SEP 2000 |
660 pages |
| Authors:
Antonio Lapucci; Marco Ciofini; EUROPEAN OFFICE OF AEROSPACE RESEARCH AND DEVELOPMENT FPO NEW YORK 09510
|
| The Final Proceedings for XIII Int'I Symposium on Gas Flow & Chemical Lasers and High Power Laser Conference, 18 September 2000-22 September 2000 This is an interdisciplinary conference. Topics include CO2 and CO lasers, metal vapor lasers, chemical lasers, solid state lasers, diode lasers, VUV/XUV lasers, new laser media, laser physics modeling, laser resonators, beam delivery, adaptive optics, fiber lasers, diffractive optics, and applications. |
|
| Electronic Spectroscopy of B Atoms and B2 Molecules Isolated in Para-H2, Normal-D2, Ne, Ar, Kr, and Xe Matrices |
15 MAY 2000 |
42 pages |
| Authors:
Simon Tam; Michel Macler; Michelle E. DeRose; Mario E. Fajardo; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST
|
| We report spectroscopic observations on B atoms isolated in cryogenic parahydrogen (pH2), normal deuterium (nD2), Ne, Ar, Kr, and Xe matrices, and of B2 molecules in Ne, Ar, Kr, and Xe matrices. The 2s(sup 2)3s((sup 2)S) left arrow 2s(sup 2)2p((sup 2)P) B atom Rydberg absorption suffers large gas-to- matrix blue shifts, increasing from +3000 to +7000/cm in the host sequence: Xe |
|
| The Interaction of Ultraviolet Laser Radiation with Metal and Semiconductor Surfaces |
20 APR 1999 |
21 pages |
| Authors:
Richard M. Osgood Jr; COLUMBIA RADIATION LAB NEW YORK
|
| The work during this contract period focused on phenomena at nanostructured metal and semiconductor surfaces, which are probed using short- pulse photoemission. Specifically, the program was to investigate the low- dimensional quantum confinement of electrons on spatially-patterned surfaces of single-crystal metals. It also aimed to expand the applications, the technique, and the instrumentation for nonlinear optical techniques of surface electrons. Electronic systems of reduced dimensionality are of interest for a ... |
|
| Lanthanide Doped Crystals for Tunable UV Lasers |
MAR 1999 |
49 pages |
| Authors:
Richard Moncorge; LABORATOIRE DE SPECTROSCOPIC ATOMIQUE CAEN (FRANCE)
|
| Several Pr3+ doped fluoride and oxide crystals, most of them being grown in our laboratory, are investigated here spectroscopically to examine their potential use for tunable UV laser systems. The study is both experimental and theoretical with emphasis on measurements of excited state absorption (ESA) spectra, in particular to evaluate the possibility to operate these laser systems after two step excitations using visible/near UV pump photons. The complex electronic structure ... |
|
| The Mechanism and Dynamics of Explosive Combustion in Aerosol Fuels |
1999 |
|
| Authors:
Roger E. Miller; Tomas Baer; NORTH CAROLINA UNIV AT CHAPEL HILL DEPTOF CHEMISTRY
|
| This project investigates the explosive combustion of aerosol fuels using a single particle mass spectrometer. Initiating explosive reactions of small samples (^10 (exp -12) grams) in vacuum allows the intermediate products of the reaction to escape into a collisionless region where we detect them using laser spectroscopy. Recent results from our laboratory explore the mechanism of amine sensitization in nitromethane. We initiate the decomposition of ... |
|
| Advanced Vacuum Equipment for Laser Plasma Research |
31 AUG 1998 |
7 pages |
| Authors:
J. Scharer; WISCONSIN UNIV-MADISON DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This equipment grant was utilized to provide two state-of-the-art vacuum facilities for seeded air plasma research on the AFOSR Grant F49620-97- 0262 entitled "Laser and Radiofrequency Plasma Sources." Over $24,000 in University matching funds were provided to acquire the equipment. The laser plasma facility provided a first class vacuum facility with dry, chemically hardened, turbopump and mechanical pumps, vacuum windows and lenses for the ultraviolet laser, a residual gas analyzer ... |
|
| Studies in State-to-State Energy Transfer |
01 JUL 1998 |
30 pages |
| Authors:
Ian Smith; BIRMINGHAM UNIV (UNITED KINGDOM)
|
| The measurement and understanding of the rates at which energy is transferred in intermolecular collisions are problems of long-standing interest in chemical physics. Such processes play a crucial role in many environments: for example, in atmospheric chemistry, especially at high altitudes, in gas lasers, in combustion and in the chemistry of deep space, especially in the characterisation of dense interstellar clouds. Gas-phase collisional energy ... |
|
| 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, ... |
|
| The Evaporation of Liquid Droplets in Highly Turbulent Gas Streams |
31 MAY 1998 |
8 pages |
| Authors:
Richard D. Gould; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| Single acetone and heptane droplets were suspended from a hypodermic needle in turbulent airflow, and the Nusselt number was obtained from direct measurements of the droplet diameter and evaporation rate. Acetone was selected because it fluoresces when irradiated with ultraviolet laser radiation while heptane was selected because of its high volatility compared with water, methanol, and ethanol which were used previously. Planar laser induced fluorescence (PLIF) measurements were made to ... |
|
| An Ultraviolet X-Ray Laser Source for Core Level Spectroscopy and Dynamics of Metal Cluster/Ceramic Chemistry |
31 MAY 1998 |
3 pages |
| Authors:
Stephen R. Leone; Veronica M. Bierbaum; COLORADO UNIV AT BOULDER
|
| A titanium sapphire ultrafast laser system was procured and merged with a high repetition rate pulsed valve to produce higher harmonic light output in a rare gas jet. The ultrafast laser system consists of a seed laser, a regenerative amplifier, and a two-pass power amplifier. The system operates' at 2.8 mJ energy per pulse, 75 fs pulse duration, and 1000 Hz repetition rate. Higher harmonics up to 20 eV have ... |
|
| Blue/UV Emitting GaN Laser |
APR 1998 |
39 pages |
| Authors:
William A. Davis; ROME LAB ROME NY
|
| This report presents results from an epitaxial growth study of Gallium Nitride (GaN) for use as ultraviolet (UV) and blue laser diodes and light emitting diodes (LEDs). The method of growth investigated was Molecular Beam Epitaxy (MBE). The group V source was nitrogen gas that was cracked utilizing a 13.56 MHz Radio Frequency (RF) plasma source. From this RF plasma, sufficient atomic nitrogen was produced to obtain growth rates of ... |
|
| Instrumentation for Processing and Characterization of Nano-Modulated Ceramics |
12 MAR 98 |
11 pages |
| Authors:
Vladimir N. Litvinenko; DUKE UNIV DURHAM NC
|
| This grant was sponsored by the FY95 Defense University Research Instrumentation Program (DURIP). The objective was to acquire instrumentation compatible with the Duke University Free Electron Laser (FEL) Laboratory light sources in the infrared (IR), ultra-violet (Uv), extreme ultra-violet (XUV), X- Ray and gamma-ray wavelength regions, that would support the research and characterization of advanced materials, including nano-modulated coatings and ceramics. This report summarizes ... |
|
| Scientific Workshop on Fundamentals and Modeling of Lasers and Ultrashort Pulse Interactions, 20-25 July 1997 |
JUL 97 |
38 pages |
| Authors:
UNIVERSITY COLL CORK (IRELAND)
|
| The Final Proceedings for Fundamentals and Modeling of Lasers and Ultrashort Pulse Interactions, 4 August 1997 - 8 August 1997. The Topics covered include: Interaction of light with semiconductor media; laser simulation models; nonlinear control strategies for semiconductor laser output; high brightness, wide aperture laser sources. |
|
| Laser Spectroscopy of Oxygen Rings, Nitrogen Rings, and Other Novel High Energy Density Forms of Matter |
11 SEP 96 |
22 pages |
| Authors:
Richard J. Saykally; CALIFORNIA UNIV BERKELEY DEPT OF CHEMISTRY
|
| New methods are explored for producing and characterizing proposed new HEDM molecules - covalent nitrogen and oxygen rings. A laser ablation 'supersonic catalytic plasma reactor' was developed, wherein a metal target is vaporized by a pulsed UV laser and reactant gases are added to the buffer gas. A pulsed corona discharge nozzle was developed for the same purpose. Cavity Ringdown and VUV laser ionization mass spectroscopy are Laser Absorption Spectroscopy ... |
|
| Atomic Layer Epitaxy of Group IV Materials: Surface Processes, Thin Films, Devices and Their Characterization |
JUN 96 |
25 pages |
| Authors:
Robert F. Davis; S. Bedair; N. A. El-Masry; Z. Sitar; S. K. Han; NORTH CAROLINA STATE UNIV AT RALEIGH
|
| The growth parameter, alpha, the ratio of the growth rates on (100) and (111) facets for diamond films deposited on Si and Ti by microwave plasma CVD has been studied using SEM micrographs. Different morphologies were generated on Si under different deposition conditions. The value of alpha increased with increasing temperature and increasing methane concentration, as expected. A value of alpha for Ti was not obtained due to the heavily ... |
|
| Organization of the 1996 Advanced Solid-State Lasers Topical Meeting |
FEB 96 |
467 pages |
| Authors:
OPTICAL SOCIETY OF AMERICA WASHINGTON DC
|
| Partial contents: WB Ultraviolet/Blue Lasers; Infrared lasers; Parametric Oscillators; Short Pulse Lasers; Nonlinear Frequency Conversion Poster Session; Near Infrared Lasers; High Power Lasers; Novel Architectures Poster Session; The Mid Infrared Lasers; Spectroscopy and Characterization; Spectroscopy Poster Session; Novel Architecture; Short Pulse Lasers; IR Lasers II Poster Session; Visible/Ultraviolet Lasers. |
|
| AASERT: Fracto-Emission from Metal Ceramic Interfaces. |
20 DEC 1995 |
4 pages |
| Authors:
J. T. Dickinson; WASHINGTON STATE UNIV PULLMAN
|
| A description of the scope of work and important results from AASERT funding is presented. The major areas of sutdy included the types of defects produced by mechanical deformation, fracture, polishing, and abrasion on inorganic single crystals and polymer surfaces and the way these defects interacted with UV laser irradiation. The use of photoluminescence to quantitatively and spatially characterize these defects is described. The role of such defects in the ... |
|
| Research on the Physics of Ultra-High Brightness, Ultra-Relativistic Electron Beams |
29 NOV 95 |
5 pages |
| Authors:
John M. Madey; DUKE UNIV DURHAM NC DEPT OF PHYSICS
|
| It is noteworthy that this research has led both to record breaking experimental demonstrations of the accelerator technology required for high power, short wavelength FEL operation and also the critical theoretical description and analysis of a number of novel low cost approaches to the production of high power XUV, X-ray and gamma ray radiation. |
|
| Pulsed Laser Deposition Improvements by Self-Directed Control |
MAY 95 |
26 pages |
| Authors:
Samuel J. Laube; FEDERAL ENERGY REGULATORY COMMISSION ATLANTA GA
|
| Improvements in material thin coatings for the year 2000 and beyond require a radical new approach to deposition processes. Pulsed Laser Deposition (PLD) is one such deposition process which offers deposition of complex materials currently not possible with other deposition methods. Unfortunately, it is not enough to control thin film material composition, but thin film stoichiometry, micro and macro stress and strain, and thickness as well. It is also desirable ... |
|
| Fundamental Studies of a High Energy Molecular System: Spectroscopy of Boron in Hydrogen Clusters. ASSERT-92 |
24 JUN 94 |
3 pages |
| Authors:
Mitchio Okumura; CALIFORNIA INST OF TECH PASADENA
|
| The graduate student and the undergraduates supported by this AASERT award have designed and fabricated a molecular beam spectroscopy apparatus for the study of metal-hydrogen complexes. This instrument is necessary for accomplishing the tasks set out for both the parent award and the AASERT grant. The students have also aided in the design of both a novel cryogenically-cooled laser vaporization source and a second chamber, currently being fabricated, for resonant ... |
|
| A URI Program for Ultraviolet/Extreme Ultraviolet Research |
15 APR 94 |
|
| Authors:
John M. Madey; DUKE UNIV DURHAM NC
|
| The purpose of the 3-year effort was to facilitate research and training in free electron laser and synchrotron device physics in the UV/XUV portion of the spectrum and to undertake research in those areas of optical technology, materials science, chemistry and physics relevant to the requirements, and capabilities of these devices. As documented here, these objectives were accomplished by: (1) Developing the basic instrumentation and operating support required to carry ... |
|
| Laser Induced Reaction for Prebond Surface Preparation of Aluminium Alloys |
APR 1994 |
33 pages |
| Authors:
M. Rotel; J. Zahavi; A. Buchman; H. Dodiuk; ISRAEL INST OF METALS HAIFA
|
| The objective of this research is to establish the effect of excimer ArF UV laser on the Al alloy surface microstructure and activity and to find its correlation with the macro behavior of shear strength and failure locus. The system treated was adhesively bonded Al joints with structural adhesives. These adhesives are normally used in bonding and repairing processes for aerospace application. Surface treatment for bonding ... |
|
| Intentionally Short-Range Communications (ISRC) |
FEB 94 |
76 pages |
| Authors:
J. Yen; P. Poirier; M. O'Brien; NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
|
| The U.S. Marine Corps (USMC) desired to develop short-range communications links whose ranges are intentionally limited to very short distances. These links support tactical missions such as LAN Backbone, Wideband Data Link, and Company Radio. The short-range limitation arises from the need for low probability of detection and intercept (LPD/LPI). Since the detection of an undecipherable transmission would still provide an enemy with information regarding transmitter location and allow him ... |
|
| Laser Induced Reaction for Prebond Surface Preparation of Aluminum Alloys |
JAN 1994 |
37 pages |
| Authors:
M. Rotel; J. Zahavi; A. Buchman; H. Dodiuk; ISRAEL INST OF METALS HAIFA
|
| The objective of this research is to establish the effect of excimer ArF UV laser on the Al alloy surface microstructure and activity and to find its correlation with the macro behavior of shear strength and failure locus. The system treated was adhesively bonded Al joints with structural adhesives. These adhesives are normally used in bonding and repairing processes for aerospace application. Surface treatment for bonding ... |
|
| Laser and Fourier Transform Spectroscopy of Novel Propellant Molecules |
JAN 94 |
20 pages |
| Authors:
Peter F. Bernath; WATERLOO UNIV (ONTARIO) DEPT OF CHEMISTRY
|
| A wide variety of molecules were studied by the techniques of Fourier transform spectroscopy and visible laser spectroscopy. Molecules studied include CCN, CaBHsub4, CHsub3N, CN, IF, ICl, IBr, BC, CH, Csub2, Csub3, Csub60, LiF, AlF, AlCl, HF, HCl, BeFsub2, BiH, AlH, BaH, and GaH. These molecules were detected by infrared, visible and ultraviolet emission and absorption measurements. |
|
| Laser and Fourier Transform Spectroscopy of Novel Propellant. |
JAN 1994 |
|
| Authors:
Peter F. Bernath; WATERLOO UNIV (ONTARIO) DEPT OF CHEMISTRY
|
| A wide variety of molecules were studied by the techniques of Fourier transform spectroscopy and visible laser spectroscopy. Molecules studied include CCN, CaBHsub4, CHsub3N, CN, IF, ICl, IBr, BC, CH, Csub2, Csub3, Csub60, LiF, AlF, AlCl, HF, HCl, BeFsub2, BiH, AlH, BaH, and GaH. These molecules were detected by infrared, visible and ultraviolet emission and absorption measurements. |
|
| Visit to the Minister of International Trade and Industries' (MITI's) Electrotechnical Laboratory (ETL) on 25 October 1993 |
25 OCT 93 |
4 pages |
| Authors:
S. J. Yakura; ASIAN OFFICE OF AEROSPACE RESEARCH AND DEVELOPMENT APO AP 96337-0007
|
| This trip report discusses high power laser research being carried out at Optoelectronics Division of the Minister of International Trade and Industry 's (MITI's) Electrotechnical Laboratory (ETL) for the generation of coherent soft x-ray radiation based on interactions of in tense ultrashort-pulse lasers with rare gases. Over the past few years, ETL researchers have performed experiments to find out mechanisms associated with interactions of ultrashort- pulse lasers with rare gases. ... |
|
| A High Performance Diamond Thin Film Cold Cathode |
29 SEP 93 |
11 pages |
| Authors:
Nalin Kumar; Howard Schmidt; S I DIAMOND TECHNOLOGY INC HOUSTON TX
|
| In the first two months of this project, we have deposited a variety of amorphic diamond coatings on various types of substrates including glass, copper, molybdenum and chromium. The films of various thicknesses have been deposited which are ready for testing. In addition, we have designed and constructed two low voltage test setups as well completed these tests for testing the high current emission properties of these films. These are ... |
|
| Ocular Damage Induced by Ultrashort Laser Pulses |
SEP 93 |
34 pages |
| Authors:
Joseph A. Zuclich; W. R. Elliott; Clarence P. Cain; Gary D. Noojin; W. P. Roach; ANALYTIC SCIENCES CORP READING MA
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| A study has been conducted of interaction effects and damage mechanisms of ultrashort laser pulses in the eye. The preliminary results reported here utilized rabbit subjects and ocular tissues isolated from the rabbit eye. Pulsewidths ranged from 4 ns down to 90 fs. In every case, a visible wavelength was used--either doubled Nd:YAG at 532 nm or the 580-nm output of a pumped dye laser. In the living subjects we ... |
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Reports by Keyword(s)
ULTRAVIOLET LASERS
