| Feasibility of Developing Academic Laboratories Using a Low-Cost Robot |
Sep-2009 |
128 pages |
| Authors:
Antonio Valle; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
 | The objective of this research was to investigate the feasibility of developing new academic laboratories for an introductory robotics course at the Naval Postgraduate School (NPS) using low-cost commercially-available robots. In particular, this research used a desktop computer with Fedora 8 Linux operating system, a wireless network and the Garcia robot from Acroname Incorporated. The Garcia robot is a wheeled robot that has many onboard devices, such as encoders, infrared ... |
|
| A New Kind of Laser Microphone for Photoacoustic Applications |
Dec-2008 |
8 pages |
| Authors:
Feng Jin; Sudhir Trivedi; Chen-Chia Wang; V Swaminathan; Narasimha S Prasad; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ
|
| We present in this paper a new kind of laser-based microphone device capable of detecting minute displacements of the microphone diaphragm, leading to drastically improved sensitivity in detecting the impinging pressure waves like acoustic waves and water waves over existing state-of-the-art laser and fiber-optic microphones. The drastically improved sensitivity in detecting diaphragm surface displacements of the novel laser microphone leads to niche applications including the photoacoustic detection of molecules and ... |
|
| Laser-Pumped Coherent X-Ray FEL |
14-Nov-2008 |
36 pages |
| Authors:
Phillip Sprangle; Joseph Penano; Bahman Hafizi; NAVAL RESEARCH LAB WASHINGTON DC BEAM PHYSICS BRANCH
|
| In a laser-pumped x-ray free electron laser (FEL) an intense laser field replaces the magnetic wiggler field of a conventional FEL. Depending on the intensity and quality of both the electron beam and pump laser, the Thomson backscattered radiation can be coherently amplified. in a conventional FEL, the generation of x-rays requires electron beam energies in the multi-GeV range. In a laser-pumped x-ray FEL, electron beam energies in the multi-MeV ... |
|
| National Aerospace Leadership Initiative - Phase I |
30-Sep-2008 |
251 pages |
| Authors:
Mansfield; Robert E Jr; Jeffrey Dalton; Philip Churchill; CONNECTICUT CENTER FOR ADVANCED TECHNOLOGY HARTFORD CT
|
| The first phase of the multi-phase National Aerospace Leadership Initiative (NALI) has been completed. Four major tasks were initiated and carried out under NALI Phase I. In Task I, the foundation for the National Center for Aerospace Leadership has been established and important outreach and educational programs were conducted. Significant accomplishments in gas turbine engine modeling and in factory simulation and modeling has been made in Task II. Task III ... |
|
| European Conferences on Biomedical Optics. Held in Munich, Germany on 17-21 June 2007 |
08-May-2008 |
45 pages |
| Authors:
Eugene Arthurs; Marilyn Gorsuch; SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS BELLINGHAM WA
|
| ECBO 2007 was the most successful event held to date. There were a total of 537 attendees from around the world. Job functions ranged from R&D: applied research, basic research, product development; to engineering and design, student, and educator. Subjects explored in depth included molecular imaging, optical coherence tomography, diagnostic optical spectroscopy, diffuse optical imaging, confocal, multiphoton, and nonlinear microscopic imaging, novel optical instrumentation, therapeutic laser applications, and bio-photonics in ... |
|
| Shock Tube Measurements of Ignition Processes and Spray-Shock Wave Interactions |
06 APR 2008 |
26 pages |
| Authors:
Ronald K. Hanson; David F. Davidson; STANFORD UNIV CA DEPT OF MECHANICAL ENGINEERING
|
| We report results of high-temperature shock tube research aimed at improving knowledge of the combustion behavior of diesel, jet and related fuels. Research was conducted in four Stanford shock tube facilities and focused on the following topics: (1) development of the aerosol shock tube; (2) ignition delay time measurements of gaseous jet fuels (JP-8 and Jet-A) and surrogate components at high pressures and low temperatures; (3) laser absorption measurements of ... |
|
| Filtered Rayleigh Scattering Measurements in a Buoyant Flow Field |
MAR 2008 |
141 pages |
| Authors:
Steven M. Meents; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Filtered Rayleigh Scattering (FRS) is a non-intrusive, laser-based flow characterization technique that consists of a narrow linewidth laser, a molecular absorption filter, and a high resolution camera behind the filter to record images. Gases of different species have different molecular scattering cross-sections that become apparent as they pass through the interrogating laser light source, and this difference is used to discriminate between the different gaseous components. This study focuses on ... |
|
| Laser-Based Detection Methods for Explosives |
SEP 2007 |
76 pages |
| Authors:
Chase A. Munson; Jennifer L. Gottfried; Jr. De Lucia Frank C.; Kevin L. McNesby; ANDRZEJ W. MIZIOLEK; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Many well-known explosive detection techniques such as mass spectrometry and chromatography rely on close-contact sampling of surface residues or explosive vapors. Effective detection of explosive materials using laser-based methods has been demonstrated in close-contact and standoff (tens of meters) configurations. This work reviews the current technical progress in laser-based explosive detection methods such as infrared spectroscopy, Raman spectroscopy, terahertz spectroscopy, laser-induced breakdown spectroscopy, and photo fragmentation. The potential for standoff ... |
|
| Laboratory Determination of Thermal Protection System Materials Surface Catalytic Properties |
01 JUL 2007 |
33 pages |
| Authors:
Jochen Marschall; SRI INTERNATIONAL MENLO PARK CA MOLECULAR PHYSICS LAB
|
| Different experimental approaches to measuring catalytic reaction efficiencies on thermal protection system materials are reviewed. Special emphasis is given to the theory and application of the diffusion tube side-arm reactor technique. In this technique, reactants diffuse into a dead-end tube and are progressively removed from the gas phase by surface reactions on the walls, establishing unique steady-state concentration profiles along the length of the tube. Reactant loss probabilities are determined ... |
|
| Inactivation of Viruses by Coherent Excitations with a Low Power Visible Femtosecond Laser |
05 JUN 2007 |
6 pages |
| Authors:
K. T. Tsen; Shaw-Wei D. Tsen; Chih-Long Chang; Chien-Fu Hung; T.-C. Wu; Juliann G. Kiang; ARIZONA STATE UNIV TEMPE DEPT OF PHYSICS
|
| Background: Resonant microwave absorption has been proposed in the literature to excite the vibrational states of microorganisms in an attempt to destroy them. But it is extremely difficult to transfer microwave excitation energy to the vibrational energy of microorganisms due to severe absorption of water in this spectral range. We demonstrate for the first time that, by using a visible femtosecond laser, it is effective to inactivate viruses such as ... |
|
| Laser-Powered Thrusters for High Efficiency Variable Specific Impulse Missions (Preprint) |
10 APR 2007 |
8 pages |
| Authors:
C. R. Phipps; J. R. Luke; W. D. Helgeson; PHOTONIC ASSOCIATES SANTA FE NM
|
| Our objective is to develop an engine with high efficiency, and specific impulse which can be varied over more than an order of magnitude to match the requirements of efficient spacecraft propulsion in the constant momentum propulsion regime. Laser ablation propulsion uniquely offers an almost arbitrarily large range of exhaust velocity, since it depends only on incident laser intensity. We have shown that thrust efficiency remains good over the specific ... |
|
| Iran's Nuclear Program: Recent Developments |
22 FEB 2007 |
|
| Authors:
Sharon Squassoni; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
 | International Atomic Energy Agency (IAEA) inspections since 2003 have revealed two decades' worth of undeclared nuclear activities in Iran, including uranium enrichment and plutonium separation efforts. Iran agreed in 2003 to suspend sensitive activities in negotiations with Germany, France, and the United Kingdom (European Union-3), which broke down in August 2005. On September 24, 2005, the IAEA Board of Governors found Iran to be in noncompliance with its Nuclear Nonproliferation ... |
|
| Development of an Electron-Positron Source for Positron Annihilation Lifetime Spectroscopy |
2007 |
18 pages |
| Authors:
John A. Nees; MICHIGAN UNIV ANN ARBOR CENTER FOR ULTRAFAST OPTICAL SCIENCE
|
| Laser intensities capable driving relativistic phenomena are delivered in a single-wavelength spot size on solid targets producing energetic electrons for positron production. This program has accomplished the production of >1 MeV electron energies with laser pulse energy of ~ 1mJ at 500Hz repetition rate. The properties of the laser, diagnostics and the energetic electron emission are discussed. Application of the laser-produced plasma phenomena to positron generation is discussed and future ... |
|
| Advanced Chemical Hydride-Based Fuel Cell Systems for Portable Military Applications |
NOV 2006 |
9 pages |
| Authors:
Paul Osenar; PROTONEX TECHNOLOGY CORP SOUTHBOROUGH MA
|
| The modern military continues to introduce advanced electronic devices such as night vision equipment, global positioning systems, laser range finders and target designators, digital communications systems, remote networking and intelligence gathering sensors. These new technologies are generating ever-increasing power requirements for the modern soldier, and today s state-of-the- art batteries and other traditional power generation sources are failing to keep pace with these growing power needs. New technologies are emerging ... |
|
| Advances in Technology to Support Battlefield Acoustic Sensing |
OCT 2006 |
9 pages |
| Authors:
Henry E. Bass; MISSISSIPPI UNIV UNIVERSITY NATIONAL CENTER FOR PHYSICAL ACOUSTICS
|
| It is not likely that better programming, slightly faster chips, or greater memory will advance the utility of current battlefield acoustic systems very much. Now is a good time to look at how new technology breakthroughs might form the basis for battlefield "acoustics" in the future. Indeed, the conflict in Iraq has once again proven the utility of acoustic sensors on the battlefield and has justified much of our past ... |
|
| Computational Nonlinear Optics: Femtosecond Atmospheric Light String Applications |
20 SEP 2006 |
18 pages |
| Authors:
Jerome V. Moloney; E. M. Wright; J. C. Diels; M. Brio; M. Kolesik; ARIZONA UNIV BOARD OF REGENTS TUCSON
|
| The main technical achievement of the project was the development of a comprehensive vector Maxwell unidirectional laser pulse propagator to accurately simulate intense ultra-short atmospheric light strings, white-light super-continuum generation across a broad landscape of applications, short range THz emission from plasma channels left in the wake of critically-collapsing light strings, nonlinear X- and O-wave generation in air, water and condensed matter and super-continuum shaping in sub-micron diameter fiber cores ... |
|
| Remote, Aerial, Trans-Layer, Linear and Non-Linear Downlink Underwater Acoustic Communication |
Sep-2006 |
8 pages |
| Authors:
Fletcher Blackmon; Lynn Antonelli; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| Abstract-Both the linear mechanism for optical to acoustic energy conversion are explored for opto-acoustic communication from an in-air platform to a submerged vessel such as a submarine or unmanned undersea vehicle. This downlink communication can take the form of a bell ringer function for submerged platforms or for the transmission of text and/or data. The linear conversion mechanism, also known as the linear opto-acoustic regime where laser energy is converted ... |
|
| New Experimental Approaches and Theoretical Modeling Methods for Laser Cooling Atoms and Molecules |
27 JUL 2006 |
13 pages |
| Authors:
T. H. Bergeman; H. J. Metcalf; STATE UNIV OF NEW YORK AT STONY BROOK RESEARCH FOUNDATION
|
| The first part of this project involved continued development of theoretical models of diatomic molecular electronic level structure for application to the production of ultracold diatomic molecules via photoassociation. Recently, there has been considerable interest in producing molecules at the temperatures achieved for laser-cooled atoms, for applications to "coherent chemistry," studies of molecule-atom and molecule-molecule interactions. Bose condensates of molecules and for quantum computing. It is advantageous to produce cold ... |
|
| Time-Resolved Diffraction Profiles and Atomic Dynamics in Short-Pulse Laser-Induced Structural Transformations: Molecular Dynamics Study |
16 MAY 2006 |
20 pages |
| Authors:
Zhibin Lin; Leonid V. Zhigilei; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The diffraction profiles and density correlation functions are calculated for transient atomic configurations generated in molecular dynamics simulations of a 20 nm Au film irradiated with 200 fs laser pulses of different intensity. The results of the calculations provide an opportunity to directly relate the detailed information on the atomic-level structural rearrangements available from the simulations to the diffraction spectra measured in time-resolved x-ray and electron diffraction experiments. Three processes ... |
|
| Low Noise Simultaneous Fluorescence Detection of Two Atomic States (PREPRINT) |
05 APR 2006 |
5 pages |
| Authors:
M. T. Cashen; J. B. Fixler; G. W. Biedermann; M. A. Kasevich; STANFORD UNIV CA DEPT OF PHYSICS
|
| We have demonstrated a new technique for fluorescence detection of ultracold atoms. Fluorescence from two spatially separated clouds of ultracold atoms illuminated by a mutual probe laser was imaged onto opposite quadrants of a position-sensitive detector. The populations in the two separated atomic clouds were measured by integrating the quadrant detector photocurrents. Simultaneous detection of the populations of the two atomic clouds was used to reduce noise caused by fluctuations ... |
|
| Laser Initiation and Radiofrequency Sustainment of Seeded Air Plasmas |
APR 2006 |
49 pages |
| Authors:
J. E. Scharer; WISCONSIN UNIV-MADISON DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| We have carried out research on high density [10(exp 11) - 4 x 10(exp 13)], large volume (500-2500 cc), high-pressure (20-760 Torr), laser initiated plasma produced in nitrogen, argon and air. The low ionization energy organic gas (TMAE) laser-initiated see plasmas create an initial condition that is used for plasma sustainment at much lower radiofrequency (RF) power levels (0.4 - 3 W/cc) than is the case for RF initiation alone. ... |
|
| Erbium: YAG Laser Incision of Urethral Structures for Treatment of Urinary Incontinence After Prostate Cancer Spray |
FEB 2006 |
57 pages |
| Authors:
Nathaniel Fried; JOHNS HOPKINS UNIV BALTIMORE MD SCHOOL OF MEDICINE
|
| Urethral strictures and bladder neck contractures occur in 5-20% of prostate cancer surgeries, causing incontinence. Conventional stricture treatments have widely variable success rates with sub-optimal results. Treatment failure is presumably due to mechanical and/or thermal damage to the urethra during the procedure. The objective of this research project was to test a novel Erbium:YAG laser for precise incision of the urethral stricture with minimal damage to adjacent healthy tissue. We ... |
|
| Ab Initio Relativistic Study of Formation of Ultracold Polar Molecules |
31 JAN 2006 |
10 pages |
| Authors:
Svetlana Kotochigova; TEMPLE UNIV PHILADELPHIA PA
|
| We determine conditions for effective quantum control over internal and external degrees of freedom of polar alkali-metal molecules in an optical trap. We calculate the dynamic molecular polarizability of KRb and RbCs as a function of laser frequency. The real part of the molecular polarizibility determines the depth of the trapping potential while the imaginary part contributes to laser-induced decoherences. Our results show that a relatively modest laser intensity is ... |
|
| Spectroscopy and Kinetics of Intermediates Important in Nitramine Decomposition |
12 AUG 2005 |
17 pages |
| Authors:
Paul J. Dagdigian; JOHNS HOPKINS UNIV BALTIMORE MD
|
| This project has mainly involved investigation of the spectroscopy and kinetics of several important polyatomic intermediates in the decomposition of nitramines. These studies were carried out through the use of the recently developed technique of cavity ring-down spectroscopy (CRDS),1, 2 which is very sensitive means of performing absorption spectroscopy with a very long effective path length in a table-top apparatus. CRDS experiments were initially carried on electronic transitions in the ... |
|
| Selective Laser Sintering of Polycaprolactone Bone Tissue Engineering Scaffolds |
13 JUL 2005 |
|
| Authors:
Brock Partee; Scott J. Hollister; Suman Das; MICHIGAN UNIV ANN ARBOR
|
| Present tissue engineering practice requires porous, bioresorbable scaffolds to serve as temporary 3D templates to guide cell attachment, differentiation, and proliferation. Recent research suggests that scaffold material and internal architecture significantly influence regenerate tissue structure and function. However, lack of versatile biomaterials processing methods have slowed progress towards fully testing these findings. Our research investigates using selective laser sintering (SLS) to fabricate bone tissue engineering scaffolds. Using SLS, we have ... |
|
| Studies on Impingement Effects of Low Density Jets on Surfaces - Determination of Shear Stress and Normal Pressure |
13 JUL 2005 |
|
| Authors:
Sarith P. Sathian; Job Kurian; INDIAN INST OF TECH MADRAS DEPT OF AEROSPACE ENGINEERING
|
| This paper presents the results of the Laser Reflection Method (LRM) for the determination of shear stress due to impingement of low-density free jets on flat plate. For thin oil film moving under the action of aerodynamic boundary layer the shear stress at the air-oil interface is equal to the shear stress between the surface and air. A direct and dynamic measurement of the oil film slope is measured using ... |
|
| Ceramic Machining Evaluation |
24 JUN 2005 |
2 pages |
| Authors:
NATIONAL CENTER FOR DEFENSE MANUFACTURING AND MACHINING LATROBE PA
|
| The U.S. Army Research, Development and Engineering Command's (RDECOM) Aviation and Missile Research Development and Engineering Center's (AMRDEC) Manufacturing Science and Technology Division (MS&T) at Redstone Arsenal, Alabama, is engaged in a Ceramic Manufacturing Technology Program (CMTP). The objective of this effort is to assess current and newly developed ceramic machining technologies and to perform initial evaluation of various machining parameters and tooling. The light weight of ceramic materials and ... |
|
| High Energy Laser Applications in a Surface Combatant: Terminal Phase Theater Ballistic Missile Defense, Low Atmosphere Propagation, and Free Electron Laser Gain |
JUN 2005 |
118 pages |
| Authors:
Sean P. Niles; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Free Electron Laser (FEL) can provide the naval surface combatant with a directed energy weapon that can be used against a large target set. Due to space constraints in a shipboard installation, an exploration is conducted to show the feasibility of short Rayleigh length FELs using a FEL simulation. Low atmosphere engagements are discussed through the modeling of a turbulence module for laser propagation in cruise missile defense applications. ... |
|
| 248-NM Laser Photolysis of CHBr3/O-Atom Mixtures: Kinetic Evidence for UV CO(A)-Chemiluminescence in the Reaction of Methylidyne Radicals with Atomic Oxygen |
APR 2005 |
19 pages |
| Authors:
Ghanshyam L. Vaghjiani; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
|
| Giant Momentum Coupling Coefficients from Nanoscale Laser-Initiated Exothermic Compounds |
APR 2005 |
6 pages |
| Authors:
Claude R. Phipps; James R. Luke; Wesley D. Helgeson; Darren Naud; Michael Hiskey; Lukas Urech; Thomas Lippert; Alexander Wokaun; PHOTONIC ASSOCIATES SANTA FE NM
|
| We report here on results obtained with laser-initiated micro-propellants, such as PVN, PVC, GAP, NC, and mixtures of these. All samples were doped with a laser absorbing component. In some cases, this was carbon nanopearls with 10nm mean diameter, while, in others, it was a carbon-based ink with m-size particles. We also report results of performance tests for absorbers tuned to the 935-nm laser wavelength. |
|
| Applications of Laser Diagnostics |
MAR 2005 |
708 pages |
| Authors:
Larry P. Goss; INNOVATIVE SCIENTIFIC SOLUTIONS INC DAYTON OH
|
| This report describes the results of experimental and numerical investigations on gas-turbine combustion and fuel processes. The purpose of this program is the advancement of the state-of-the-art in laser diagnostics, modeling and simulations, propulsion sciences, advanced propulsion concepts, current and next-generation gas-turbine-engine components, and high-impact revolutionary technologies for airbreathing propulsion systems. The objectives of this research program include: Development, evaluation, and utilization of state-of-the-art-laser diagnostic techniques and analytical simulations and ... |
|
| Australian DefenceScience. Volume 13. Number 1, Autumn |
Jan-2005 |
|
| Authors:
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA)
|
| CONTENTS: Studying the Evolved Sea Sparrow Missile in captivity - A new capability has put the Evolved Sea Sparrow Missile (ESSM) through its paces in different operational scenarios, obviating the need for a large number of costly live firing exercises. Innovative ways to keep bio-fouling at bay - The growth of marine organisms on ships has long been a major problem. DSTO is exploring a range of approaches with the ... |
|
| Acquisition of Time-Varying Participating Media |
2005 |
5 pages |
| Authors:
Tim Hawkins; Per Einarsson; Paul Debevec; UNIVERSITY OF SOUTHERN CALIFORNIA MARINA DEL REY CA INST FOR CREATIVE TECHNOLOGIES
|
| We present a technique for capturing time-varying volumetric data of participating media. A laser sheet is swept repeatedly through the volume, and the scattered light is imaged using a high-speed camera. Each sweep of the laser provides a near-simultaneous volume of density values. We demonstrate rendered animations under changing viewpoint and illumination, making use of measured values for the scattering phase function and albedo. |
|
| Surface Passivation of InAs(001) With Thioacetamide |
2005 |
4 pages |
| Authors:
D. Y. Petrovykh; J. P. Long; L. J. Whitman; NAVAL RESEARCH LAB WASHINGTON DC
|
| We describe the passivation of InAs(001) surfaces with thioacetamide (CH3CSNH2 or TAM) as an alternative to the standard sulfur passivation using inorganic sulfide (NH4)2Sx. Quantitative comparison using x-ray photoelectron spectroscopy (XPS) demonstrates that TAM passivation dramatically improves the stability against reoxidation in air compared with the inorganic sulfide, with little to no etching during the treatment. We find that TAM passivation preserves the intrinsic surface charge accumulation layer, as directly ... |
|
| Laser Surface Preparation for Adhesive Bonding II. Task Order 5TS5703D035S |
DEC 2004 |
69 pages |
| Authors:
Craig T. Walters; CRAIG WALTERS ASSOCIATES DUBLIN OH
|
| For several years, research has been undertaken for the U.S. Air Force to assess the utility of pulsed laser beams in the cleaning of surfaces without the use of solvents or abrasives. Initial efforts led to the development of a prototype laser-based cleaning system that could effectively remove paint, contaminants, and oxides from metal surfaces such as aluminum, stainless steel, and titanium. In follow-on research, the basic laser cleaning concepts ... |
|
| Effects of Process Variables and Size Scale on Solidification Microstructure in Laser-Based Solid Freeform Fabrication of Ti-6Al-4V |
AUG 2004 |
12 pages |
| Authors:
N. W. Klingbeil; S. Bontha; C. J. Brown; D. R. Gaddam; P. A. Kobryn; H. L. Fraser; J. W. Sears; WRIGHT STATE UNIV DAYTON OH
|
| This paper summarizes a combination of analytical and numerical modeling approaches which have been used to investigate the effects of process variables and size scale on solidification microstructure in laser-deposited Ti-6A1-4V. The analytical approach is based on the well-known Rosenthal solution for a moving point heat source, which provides dimensionless process maps for solidification cooling rate and thermal gradient (the key parameters controlling microstructure) as a function of laser deposition ... |
|
| Properties of Laser Ablation Products of Delrin with CO2 Laser |
JUL 2004 |
79 pages |
| Authors:
Wolfgang O. Schall; Hans-Albert Eckel; Jochen Tegel; Frank Waiblinger; Sebastian Walther; GERMAN AEROSPACE CENTER (DLR) STUTTGART(GERMANY) INST OF TECHNICAL PHYSICS
|
| A requirement for efficient pulsed laser propulsion from ground to LEO is the achievement of a specific impulse of up to 800's at a jet efficiency of at least 50%. With classical polymers like Delrin or POM these numbers cannot be obtained. The suggestion to use polymers with included metal powder for a better deposition of the laser energy per unit volume and thus the achievement of a higher jet ... |
|
| Properties of Laser Ablation Products of Delrin with CO2 Laser (CD-ROM) |
01 MAY 2004 |
|
| Authors:
Wolfgang O. Schall; Hans-Albert Eckel; Jochen Tegel; Frank Waiblinger; Sebastian Walther; GERMAN AEROSPACE CENTER (DLR) STUTTGART(GERMANY) INST OF TECHNICAL PHYSICS
|
| ELECTRONIC FILE CHARACTERISTICS: 8 files; .PPT, .XLS, .PDF, .DOC, and Audio Video Interleave (.AVI). PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 50.3 MB. SYSTEMS DETAIL NOTE: ABSTRACT: This report results from a contract tasking German Aerospace Center (DLR) as follows: The Grantee will develop an understanding of the parameters that control the specific energy (e.g. temperature) of gases that are produced by ablation of a ... |
|
| Vanderbilt Free-Electron Laser Center for Research in Surgery Medicine Photobiology and Materials Science |
MAY 2004 |
13 pages |
| Authors:
David W. Piston; VANDERBILT UNIV NASHVILLE TN DIV OF SPONSORED RESEARCH
|
| This program is designed to explore the militarily-relevant medical applications of high-power, tunable infrared radiation available from unique accelerator-based light sources, the Mark Ill FEL, the monochromatic X-ray system, and a new Smith-Purcell THz FEL. As applications mature, we also develop cost-efficient, dedicated systems to expand the use of these applications beyond the FEL Center. During the last funding period, we have developed a comprehensive research program directed towards a ... |
|
| Bending Strength Test and Evaluation of a Transtibial Prosthetic Socket Fabricated by Selective Laser Sintering |
MAY 2004 |
55 pages |
| Authors:
Amanda J. Brooks; TEXAS UNIV AT AUSTIN DEPT OF MECHANICALENGINEERING
|
| Transtibial prosthetic sockets made using selective laser sintering (SLS) of Duraform (Trademark) polyamide have no documented failure data. To produce prostheses with safe weight and usage limits, a nonstandard bending test was needed to determine the maximum safe loading of the socket and to recommend design improvements. The bending test was designed to replicate forces experienced by a wearer stepping down and forward as from a slight elevation. This test, ... |
|
| Some Results of a Study of the Effectiveness and Cost of a Laser-Powered Lightcraft Vehicle System |
APR 2004 |
30 pages |
| Authors:
David Froning; Leon McKinney; Franklin Mead; William Larson; Alan Pike; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
|
| Ultra-Smooth As-Deposited Optical Films |
31 MAR 2004 |
30 pages |
| Authors:
Dr. Namwoong Paik; PLASMION CORP HOBOKEN NJ
|
| In the Phase I program, PLASMION demonstrated the capability of Negative Sputter Ion Deposition to deposit optical thin films with state-of-the- art properties, specifically ultrasmooth surfaces, high packing density, refractive index close to bulk values, and stability to environmental exposure. The objective of this Phase II program was to utilize these films to fabricate high-quality, economical optical devices for high energy laser applications. Prototype dielectric mirrors will be delivered which ... |
|
| Atmospheric Simulation Using a Liquid Crystal Wavefront Controlling Device |
23 MAR 2004 |
92 pages |
| Authors:
Matthew R. Brooks; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Test and evaluation of laser warning devices is important due to the increased use of 1aser devices in aerial applications. In this thesis, an atmospheric aberrating system is deve1oped to enable in-1ab testing of laser warning devices. This system employs laser 1ight at 632.8nm from a He1ium-Neon source and a spatial light modulator (SLM) to cause phase changes using a birefringent liquid crystaJ material. Before the system can be used, ... |
|
| The Effect of Variability in Stereo Camera Calibration and Registration Parameters on Three-Dimensional Reconstruction Distance Estimates |
FEB 2004 |
53 pages |
| Authors:
William F. Oberle; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The process of calculating distance front binocular or stereo vision is tented three-dimensional (3-D) reconstruction. Unlike some other approaches for estimating distance, e.g., LADAR (laser detection and ranging), this is not a direct measurement but is a geometric analysis requiring the knowledge of experimentally measured and mathematically derived parameters. Variability in these parameters results in variability in the calculated distances. This report investigates the effect that the variability in these ... |
|
| Quantitative Determination of Singlet Oxygen Density and Temperature for Oxygen-Iodine Laser Applications |
2004 |
6 pages |
| Authors:
Manish Gupta; Thomas Owano; Douglas S. Baer; Anthony O'Keefe; Skip Williams; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
|
|
| 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 ... |
|
| Two-Photon Laser Micro-Nano Fabrication; Understanding from Single-Voxel Level |
19 NOV 2003 |
8 pages |
| Authors:
Satoshi Kawata; Hong-Bo Sun; OSAKA UNIV (JAPAN) DEPT OF APPLIED PHYSICS
|
| For laser nanofabrication using two-photon photopolymerization a deep understanding of the nature of focal spots that are related to two-photon excitation is essential for achieving a high spatial resolution in three dimensions. Here we report the use of a technology we call ascending scan for characterizing the three-dimensional size and shape of single polymerization elements (voxels) and introduce several features of voxels that have not been fully noticed before. These ... |
|
| Programmable Technologies for Micro- and Nano-Scale Pattern and Material Transfer and Possible Applications for Control of Self-Assembly |
19 NOV 2003 |
14 pages |
| Authors:
David J. Nagel; GEORGE WASHINGTON UNIV WASHINGTON DC DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Programmable methods for transferring materials to surfaces in patterns can produce structures with micrometer and nanometer scale features. All such technologies involve combinations of information, materials and energy. The materials in additive technologies can originate in the vapor phase, as liquids or suspensions, or as solids. The energy can come from laser, electron or ion beams, or the pressures used in writing, dispensing, jetting or flow methods. Many of the ... |
|
| 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 ... |
|
| Mid-IR Laboratory Operation, Maintenance and Theory Support |
NOV 2003 |
14 pages |
| Authors:
David J. Gallant; BOEING/ROCKETDYNE TECHNICAL SERVICES KIRTLAND AFB NM
|
| This report summarizes the technical activity provided under task order 0015 of the SLIDERS contract. This task provided for semiconductor material processing and characterization expertise for a mid-IR semiconductor laser development laboratory, as well as computer modeling and theoretical analysis of mid-IR semiconductor laser materials and device designs. The goal of this effort was to increase the power, brightness and operating temperature of mid-IR semiconductor lasers and laser arrays. Under ... |
|
Reports by Keyword(s)
LASER APPLICATIONS
