Topics: DTIC Archive, TEXTRON DEFENSE SYSTEMS EVERETT MA, *CARBON DIOXIDE LASERS, *TEA LASERS, MODE LOCKED...
Topics: DTIC Archive, Zhong,Ji, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, *FOREIGN TECHNOLOGY, *STATE...
The broad purpose of this research has been to investigate the dynamics of flowing plasmas. Attention has been given to the processes which transfer momentum between interacting ion species in counterstreaming plasmas produced by laser irradiation of a solid target. This investigation has evolved from an examination of collisional interactions with conventional diagnostics to an extensive study of collisionless momentum transfer in magnetic fields using a broad spectrum of diagnostics,...
Topics: DTIC Archive, Silverman,Joseph, MARYLAND UNIV COLLEGE PARK INST FOR PHYSICAL SCIENCE AND...
The primary intent of the Multiwavelength IR Laser Device program was to design a CO2 TEA laser rangefinder system, based on building blocks originating in the HSTV(L) effort. The system was to be modularized to the maximum extent possible, and so configured as to permit maximum operational flexibility, i.e., the transmitter module could be used alone, as a designator, with or without its output collimator; the receiver could be remotely located as a passive receiver, etc. Additionally,...
Topics: DTIC Archive, RAYTHEON CO SUDBURY MA EQUIPMENT DEVELOPMENT LABS, *INFRARED LASERS, *RANGE FINDING,...
The available Lumonics TEA CO2 lasers (gain lengths 40 cm and 120 cm) have been mounted on an optical table and preparation of the mode-locked, line- selected output has begun. The 0.5 micro sec TEA laser pulse was considered to be too short for effective mode-locking so its pulser was modified into a simple three-element PFN to give 3 micro sec excitation. Single transverse mode operation was obtained with the 40 cm device in a folded 6m optical cavity, giving an output energy of 0.5 J in a...
Topics: DTIC Archive, TEXTRON DEFENSE SYSTEMS EVERETT MA, *CONVERSION, OSCILLATORS, OUTPUT, OPTICAL...
The final report for work done during the reporting period of January 25, 1990 to January 24, 1991 is presented. A literature survey was conducted to identify the required parameters for effective preionization in TEA CO2 lasers and the methods and techniques for characterizing preionizers are reviewed. A numerical model of the LP-140 cavity was used to determine the cause of the transverse mode stability improvement obtained when the cavity was lengthened. The measurement of the voltage and...
Topics: NASA Technical Reports Server (NTRS), CARBON DIOXIDE LASERS, CAVITIES, CHIRP, ELECTRIC DISCHARGES,...
The broad purpose of this research has been to investigate the dynamics of flowing plasmas. Attention has been given to the processes which transfer momentum between interacting ion species in counterstreaming plasmas produced by laser irradiation of a solid target. This investigation has evolved from an examination of collisional interactions with conventional diagnostics to an extensive study of collisionless momentum transfer in magnetic fields using a broad spectrum of diagnostics,...
Topics: DTIC Archive, Silverman,Joseph, MARYLAND UNIV COLLEGE PARK INST FOR PHYSICAL SCIENCE AND...
The use of a pulsed laser to evaporate dielectric materials for optical thin film deposition was investigated. Studies were performed to analyze the species present in the evaporant plume generated by a 1.5 Joule TEA-CO2 laser. the materials investigated were Al203, Si02, Zn0, PbF2, Ti02, and Hf02. Experiments were performed in a cryopumped system with a base pressure of 10 to the 8th power torr. The evaporant plume was characterized using luminescence spectroscopy, mass spectroscopy, and ion...
Topics: DTIC Archive, Sankur,H, ROCKWELL INTERNATIONAL THOUSAND OAKS CA SCIENCE CENTER, *THIN FILMS,...
This report documents the efforts of Raytheon Company to conduct a manufacturing methods and technology (MM&T) program for 10.6 micrometer carbon dioxide TEA lasers. A set of laser parameters is given and a conforming tube design is described. Results of thermal and mechanical stress analyses are detailed along with a procedure for assembling and testing the laser tube. Also provided are purchase specifications for optics and process specifications for some of the essential operations.
Topics: DTIC Archive, Luck, C F, RAYTHEON CO SUDBURY MA ELECTRO-OPTICS SYSTEMS LAB, *CARBON DIOXIDE LASERS,...
A theoretical analysis of the spatial response characteristics of photon drag detectors used for the measurement of high power pulses from C02 lasers is presented. Details of the model and the numerical methods employed are described and the results obtained for several electrode configurations together with a comparison of experimental values obtained for a typical commercial device are given. (Author)
Topics: DTIC Archive, Edwards,J G, NATIONAL PHYSICAL LAB TEDDINGTON (ENGLAND) DIV OF ELECTRICAL SCIENCE,...
The broad purpose of this research has been to investigate the dynamics of flowing plasmas. Attention has been given to the processes which transfer momentum between interacting ion species in counterstreaming plasmas produced by laser irradiation of a solid target. This investigation has evolved from an examination of collisional interactions with conventional diagnostics to an extensive study of collisionless momentum transfer in magnetic fields using a broad spectrum of diagnostics,...
Topics: DTIC Archive, Silverman,Joseph, MARYLAND UNIV COLLEGE PARK INST FOR PHYSICAL SCIENCE AND...
This report describes work performed in a continuous program of investigations on the mechanisms by which high power pulsed CO2 laser radiation interacts with target surfaces. The experimental work has been performed using a pulsed CO2 TEA laser capable of delivering up to 1000Mw/sq cm to the target surface in a pulse of duration around 100 nanoseconds. Results described in this report include the following; The diffuse reflectivity of steel and titanium targets has been measured under varying...
Topics: DTIC Archive, Ready,John F, HONEYWELL CORPORATE MATERIAL SCIENCES CENTER BLOOMINGTON MN, *LASERS,...
Topics: DTIC Archive, Zhong,Ji, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, *FOREIGN TECHNOLOGY, *STATE...
Two pulsed 10-micron transmitter systems were designed, fabricated and tested, one for use in cross-wind sensor applications, and one for target designator applications. The goal of the Incoherent TEA laser effort was to make these units capable of the required optical and electrical performance characteristics with total system lifetimes of a few million pulses. (Author)
Topics: DTIC Archive, Ganley,J T, RAYTHEON CO SUDBURY MA ELECTRO-OPTICS SYSTEMS LAB, *CARBON DIOXIDE...
A fluid mechanical model is developed to asssess the performance of a rocket that is propelled by the absorption of radiant energy from a remotely stationed, repetitively pulsed laser. The model describes the flow within a conical nozzle that is subjected to point energy depositions at the apex of the cone. A similarity solution is obtained and the specific impulse and energy efficiencies that may be achieved with such a device are determined. Fluid mechanical constraints limit the range of...
Topics: DTIC Archive, Pirri, A N, Simons, G A, Nebolsine, P E, PHYSICAL SCIENCES INC ANDOVER MA, *PULSED...
An experimental technique is described for determining the damage thresholds of glass and plastic optical material surfaces, opaque to laser radiations, when irradiated with a pulsed TEA-CO2 laser. Use of a probit analysis to estimate the irradiance required for a 50% probability of damage gives threshold levels of 4.0 J/(sq cm) for fused silica, 2.1 J/(sq cm) for soda-lime glass, 2.3 J/(sq cm) for polycarbonate, 2.3 J/(sq cm) for acrylic and 1.7 J/(sq cm) for polystyrene plastics. The...
Topics: DTIC Archive, Anctil,J C, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *OPTICAL MATERIALS,...
High energy CO2 EDL's (Electric Discharge Lasers) with unstable resonators exhibit a mode-medium interaction which spreads the focussed beam and causes loss in the far-field. Mirror edge Fresnelling may result in amplified feedback which causes a parallel-piped structure to be burned into the lasing medium. Possible confirming experiments are described. (Author)
Topics: DTIC Archive, Bentley,J H, ARMY MISSILE COMMAND REDSTONE ARSENAL AL DIRECTED ENERGY DIRECTORATE,...
The construction of TEAL (Transversely Excited Atmospheric pressure Laser) is described with reference to the required specification for single pulse thermal blooming experiments. All the major performance parameters are described, such as energy, temporal profile, spectrum and stability. In particular, several different measurements of the spatial profile are compared with theoretical predictions, which in general predict well the main features but not the finer details. Also the results of...
Topics: DTIC Archive, Eggins,P L, ATOMIC WEAPONS RESEARCH ESTABLISHMENT ALDERMASTON (ENGLAND), *TEA LASERS,...
This report describes an Ultra-Violet preionized, CO2 laser head developed at NRL for use in plasma production experiments. A 1000 Joule CO2 laser, consisting of four of these heads is to be used with a 100 J ND-glass laser to produce a large, moderately warm plasma (N = 3 x 10 to the 19th power ions, T approx 50 eV), which is to be studied in a variety of magnetic field geometries. The 3.5 liter TEA CO2 laser when connected as an oscillator followed by three amplifiers, produces one Kilojoule...
Topics: DTIC Archive, Pechacek,R E, NAVAL RESEARCH LAB WASHINGTON D C, *CARBON DIOXIDE LASERS, HIGH POWER,...
The dynamics of electron gratings formed in Hg(1 - x)Cd(x)Te at 80 K by the interference of pump and probe beams from a Carbon Dioxide TEA laser has been investigated. A CO2 TEA laser beam incident upon the backside of the sample quenches the forward mode phase conjugate signal from the pump and probe beams, with a response time no greater than 40 nsec. A model has been proposed based upon two-photon absorption and Auger recombination. A theoretical analysis of GaAs/Al(x)Ga(1 - x)As and Hg(1 -...
Topics: DTIC Archive, Kruse, Paul W, HONEYWELL INC BLOOMINGTON MN, *CARBON DIOXIDE LASERS, *OPTICAL...
Topics: DTIC Archive, Ganichev, S. D., Bel'kov, V. V., Ivchenko, E. L., Tarasenko, S. A., Sollinger, M.,...
Topics: DTIC Archive, Lou,C, FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH, *LASERS, OUTPUT, PULSES,...
This report presents results of experimental effort undertaken in the study of the initiation of laser-supported absorption (LSA) waves on solid surfaces irradiated in air with pulsed laser radiation. LSA waves may be classified as either supersonic, so-called laser-supported detonation (LSD) waves, or as subsonic, so-called laser-supported combustion (LSC) waves. In either case, a hot-air plasma (1-2 eV) is formed which propagates back up in the laser beam away from the target surface and...
Topics: DTIC Archive, Walters, C. T., Barnes, R. H., Beverly, R. E., BATTELLE COLUMBUS DIV OH,...
This report describes the design, and progress toward the construction, of systems required for the study of the propagation of 10.6 micrometers radiation from CO2 lasers (both high power pulsed and cw) through clouds, both laboratory generated and natural. The laboratory experiments of highest priority are the study of non-linear attenuation of high power TEA laser pulses (of order 10 J/sq. cm.) through optically thick clouds produced by adiabatic expansion with particular attention to change...
Topics: DTIC Archive, Browne,P F, UNIVERSITY OF MANCHESTER INST OF SCIENCE AND TECHNOLOGY (ENGLAND),...
The phase coherence properties of pulsed carbon dioxide lasers are analyzed. Experimental results for a self-pulsing helium neon ring laser are presented and used to calculate the average phase coherence time for that system. Experimental factors are the primary limitations for phase coherence. These factors influence the phase by altering the resonant cavity by mirror motion or by index of refraction changes. The importance of these two factors are assessed for high power TEA lasers using the...
Topics: DTIC Archive, Halford,Carl E, MEMPHIS STATE UNIV TN INST FOR ENGINEERING RESEARCH, *PULSED LASERS,...
The broad purpose of this research has been to investigate the dynamics of flowing plasmas. Attention has been given to the processes which transfer momentum between interacting ion species in counterstreaming plasmas produced by laser irradiation of a solid target. This investigation has evolved from an examination of collisional interactions with conventional diagnostics to an extensive study of collisionless momentum transfer in magnetic fields using a broad spectrum of diagnostics,...
Topics: DTIC Archive, Silverman,Joseph, MARYLAND UNIV COLLEGE PARK INST FOR PHYSICAL SCIENCE AND...
The broad purpose of this research has been to investigate the dynamics of flowing plasmas. Attention has been given to the processes which transfer momentum between interacting ion species in counterstreaming plasmas produced by laser irradiation of a solid target. This investigation has evolved from an examination of collisional interactions with conventional diagnostics to an extensive study of collisionless momentum transfer in magnetic fields using a broad spectrum of diagnostics,...
Topics: DTIC Archive, Silverman,Joseph, MARYLAND UNIV COLLEGE PARK INST FOR PHYSICAL SCIENCE AND...
This report describes work performed in a continuing program of investigations on the mechanisms by which high power pulsed CO2 laser radiation interacts with target surfaces. The experimental work has been performed using a pulsed CO2 TEA laser capable of delivering up to ten to the 9th power w/sq cm to the target surface in a pulse of duration around 100 nanoseconds. Results described in this report include the following: (1) Measurement of the pressure pulse induced in target materials by...
Topics: DTIC Archive, Ready,John F, HONEYWELL CORPORATE RESEARCH CENTER BLOOMINGTON MINN, *DAMAGE...
The primary intent of the Multiwavelength IR Laser Device program was to design a CO2 TEA laser rangefinder system, based on building blocks originating in the HSTV(L) effort. The system was to be modularized to the maximum extent possible, and so configured as to permit maximum operational flexibility, i.e., the transmitter module could be used alone, as a designator, with or without its output collimator; the receiver could be remotely located as a passive receiver, etc. Additionally,...
Topics: DTIC Archive, RAYTHEON CO SUDBURY MA EQUIPMENT DEVELOPMENT LABS, *INFRARED LASERS, *RANGE FINDING,...
The broad purpose of this research has been to investigate the dynamics of flowing plasmas. Attention has been given to the processes which transfer momentum between interacting ion species in counterstreaming plasmas produced by laser irradiation of a solid target. This investigation has evolved from an examination of collisional interactions with conventional diagnostics to an extensive study of collisionless momentum transfer in magnetic fields using a broad spectrum of diagnostics,...
Topics: DTIC Archive, Silverman,Joseph, MARYLAND UNIV COLLEGE PARK INST FOR PHYSICAL SCIENCE AND...
The primary intent of the Multiwavelength IR Laser Device program was to design a CO2 TEA laser rangefinder system, based on building blocks originating in the HSTV(L) effort. The system was to be modularized to the maximum extent possible, and so configured as to permit maximum operational flexibility, i.e., the transmitter module could be used alone, as a designator, with or without its output collimator; the receiver could be remotely located as a passive receiver, etc. Additionally,...
Topics: DTIC Archive, RAYTHEON CO SUDBURY MA EQUIPMENT DEVELOPMENT LABS, *INFRARED LASERS, *RANGE FINDING,...
The purpose of this report is to demonstrate a technique to generate high level, focused ultrasound by laser excitation of a material. The application is for ultrasonic nondestructive testing of components and possibly structures. The principle is that the laser energy is absorbed by a material and heats it, and the resulting thermal expansion generates a pressure wave in the material. An experimental and analytical study has been conducted into the use of carbon dioxide TEA lasers to generate...
Topics: DTIC Archive, Rudd,M J, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *Ultrasonic tests, *Ultrasonics,...
A compact, sealed, TEA-CO2 laser utilizing a double-discharge technique has been constructed and operated under single-mode conditions. Sealed operational lifetimes exceeding 1,000,000 pulses have been obtained by the addition of small quantities of hydrogen and CO to the initial gas mixtures. It has also been found that operation without helium is possible giving single-mode output energies of about 35 mJ/pulse at peak powers of about 150 kW. The pulse repetition frequency was 0.5/s. To obtain...
Topics: DTIC Archive, Pace,P, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *CARBON DIOXIDE LASERS,...
This document describes a high-repetition-rate TEA-CO2 laser system which operates in a closed loop and can produce an average output beam power in excess of 1.5 kW at 1 kHz. After a brief outline of the design concepts of this important installation, details are given of the various subsystems involved in the electrical excitation, circulation of gases and control of the optical cavity. Then follow operational characteristics and a description of the behavior of the multimodal beam of...
Topics: DTIC Archive, Morency,J -P, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *CARBON DIOXIDE...
The major objectives of this research project were to study the X-ray emission and dynamical behavior of exploded aluminum wire plasmas when subjected to intense CO2 laser radiation. The laser system based on Lumonics 601 TEA laser was optimized to produce a diffraction limited spot size (diameter 125 microns) yielding a focused intensity of 10 to the 12th power w/sqcm. The principal X-ray diagnostics consisted of two foil measurements using filtered photomultiplier detectors. These...
Topics: DTIC Archive, Bach,David R, MICHIGAN UNIV ANN ARBOR DEPT OF NUCLEAR ENGINEERING, *LASER BEAMS,...
The remote sensing of gases in complex mixtures at atmospheric pressure is a challenging problem and much attention has been paid to it. The most fundamental difference between this application and highly successful astrophysical and upper atmospheric remote sensing is the line width associated with atmospheric pressure broadening, 5 GHz in all spectral regions. In this paper, we discuss quantitatively a new approach that would use a short pulse infrared laser to modulate the...
Topics: DTIC Archive, OHIO STATE UNIV COLUMBUS DEPT OF PHYSICS, *BAROMETRIC PRESSURE, *TEA LASERS, *REMOTE...
The envelope and frequency characteristics of the output pulse of a high-repetition-rate hybrid TEA-CO2 laser are presented. Both the intrapulse and interpulse laser frequency stability are experimentally determined at repetition rates up to 300 Hz. The recovery of the CW laser signal following the generation of the TEA laser pulse is analyzed theoretically and experimentally. Short term reproducibilities of + or - 2 MHz are observed at a pulse repetition rate of 300 Hz with initial chirp rates...
Topics: DTIC Archive, Lachambre,J -L, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *PULSED LASERS,...
An experimental technique is described for determining the damage thresholds of glass and plastic optical material surfaces, opaque to laser radiations, when irradiated with a pulsed TEA-CO2 laser. Use of a probit analysis to estimate the irradiance required for a 50% probability of damage gives threshold levels of 4.0 J/(sq cm) for fused silica, 2.1 J/(sq cm) for soda-lime glass, 2.3 J/(sq cm) for polycarbonate, 2.3 J/(sq cm) for acrylic and 1.7 J/(sq cm) for polystyrene plastics. The...
Topics: DTIC Archive, Anctil,J C, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *OPTICAL MATERIALS,...
The broad purpose of this research has been to investigate the dynamics of flowing plasmas. Attention has been given to the processes which transfer momentum between interacting ion species in counterstreaming plasmas produced by laser irradiation of a solid target. This investigation has evolved from an examination of collisional interactions with conventional diagnostics to an extensive study of collisionless momentum transfer in magnetic fields using a broad spectrum of diagnostics,...
Topics: DTIC Archive, Silverman,Joseph, MARYLAND UNIV COLLEGE PARK INST FOR PHYSICAL SCIENCE AND...
An experimental technique is described for determining the damage thresholds of glass and plastic optical material surfaces, opaque to laser radiations, when irradiated with a pulsed TEA-CO2 laser. Use of a probit analysis to estimate the irradiance required for a 50% probability of damage gives threshold levels of 4.0 J/(sq cm) for fused silica, 2.1 J/(sq cm) for soda-lime glass, 2.3 J/(sq cm) for polycarbonate, 2.3 J/(sq cm) for acrylic and 1.7 J/(sq cm) for polystyrene plastics. The...
Topics: DTIC Archive, Anctil,J C, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *OPTICAL MATERIALS,...
An experimental technique is described for determining the damage thresholds of glass and plastic optical material surfaces, opaque to laser radiations, when irradiated with a pulsed TEA-CO2 laser. Use of a probit analysis to estimate the irradiance required for a 50% probability of damage gives threshold levels of 4.0 J/(sq cm) for fused silica, 2.1 J/(sq cm) for soda-lime glass, 2.3 J/(sq cm) for polycarbonate, 2.3 J/(sq cm) for acrylic and 1.7 J/(sq cm) for polystyrene plastics. The...
Topics: DTIC Archive, Anctil,J C, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *OPTICAL MATERIALS,...
Ten-micron heterodyne laser radar offers a new type of remote sensor that can add significantly to our characterization and understanding of the atmosphere. For example, accurate range-resolved measurements of air velocity via the Doppler of aerosol backscatter -- to distances of tens of kilometers -- will yield a better understanding of wind shear. This report is the assembly volume of a two-volume report intended to aid the government in assembling and operating the long pulse laser radar...
Topics: DTIC Archive, Jacobs,G B, GENERAL ELECTRIC CO SYRACUSE NY ELECTRONICS LAB, *Optical radar, *Pulsed...
An experimental technique is described for determining the damage thresholds of glass and plastic optical material surfaces, opaque to laser radiations, when irradiated with a pulsed TEA-CO2 laser. Use of a probit analysis to estimate the irradiance required for a 50% probability of damage gives threshold levels of 4.0 J/(sq cm) for fused silica, 2.1 J/(sq cm) for soda-lime glass, 2.3 J/(sq cm) for polycarbonate, 2.3 J/(sq cm) for acrylic and 1.7 J/(sq cm) for polystyrene plastics. The...
Topics: DTIC Archive, Anctil,J C, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *OPTICAL MATERIALS,...
An experimental technique is described for determining the damage thresholds of glass and plastic optical material surfaces, opaque to laser radiations, when irradiated with a pulsed TEA-CO2 laser. Use of a probit analysis to estimate the irradiance required for a 50% probability of damage gives threshold levels of 4.0 J/(sq cm) for fused silica, 2.1 J/(sq cm) for soda-lime glass, 2.3 J/(sq cm) for polycarbonate, 2.3 J/(sq cm) for acrylic and 1.7 J/(sq cm) for polystyrene plastics. The...
Topics: DTIC Archive, Anctil,J C, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *OPTICAL MATERIALS,...
This report covers in detail the solid state research work of the Solid State Division at Lincoln Laboratory for the period 1 August through 31 October 1977. The topics covered are Solid State Device Research, Quantum Electronics, Materials Research, Microelectronics, and Surface-Wave Technology. Funding is primarily provided by the Air Force, with additional support provided by the Army, ARPA, NSF, and DOE.
Topics: DTIC Archive, McWhorter, Alan L., MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB, *SOLID STATE...
Contents: Epitaxial growth of semi-insulating GaAs from Ga solutions; Optimization of alkali halide window materials; Growth of crystals for infra red window research; Fabrication of polycrystalline IR window materials; Mechanical behavior of III-V and II-VI compounds; Dielectric constant measurements; Study of defects in II-VI compounds; Theoretical studies of absorption mechanisms in IR window materials; Investigation of infrared loss mechanisms in high resistivity GaAs; Alkali halide surface...
Topics: DTIC Archive, Kroger, Ferdinand A, Marburger, John H, UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES...
A simple, reliable technique is described for frequency stabilizing a CW-TEA hybrid laser for use as a transmitter in a laser radar system with heterodyne detection. In this technique, modulation is applied to the laser cavity, the output frequency of the laser is monitored when operating in the CW mode, and the TEA laser discharge is triggered when the desired output laser frequency is detected. Details are given of the electronics used to implement the technique, as well as those for...
Topics: DTIC Archive, Cruickshank,J M, DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *Carbon dioxide...
All items of equipment were purchased during the period August, 1984 to August 1985. In August, 1985, the Principal Investigator, M. Krishana, left Yale University for Physics International Co. (PI). At PI, he is pursuing pulsed power driven x-ray lasers. The equipment acquired at Yale remains uncrated and unused, because of the departure of M. Krishnan and because of the termination of the research Grant (81-0077) on January 31st, 1986.
Topics: DTIC Archive, Krishnan,Mahadevan, YALE UNIV NEW HAVEN CT DEPT OF APPLIED PHYSICS, *LASER...
This work addresses the possibility of a high average power coherent light source in the mid-infrared, specifically in the 4.8 micrometers atmospheric window. The approach is to frequency-double the 9.55 micrometers CO2 laser line, yielding 4.775 micrometers. In order to achieve efficient conversion, the intensity of the laser is increased by intracavity resonant modulation, or modelocking. The intensity for efficient conversion in typical available lengths of doubling material is at a minimum...
Topics: DTIC Archive, TEXTRON DEFENSE SYSTEMS EVERETT MA, *INFRARED LASERS, *FREQUENCY MULTIPLIERS, *MODE...
A program to develop and apply new mid-IR lasers for Air Force applications is described. Optically pumped lasers that operate either on vibrational or electronic transitions are discussed. Systems include molecular iodine as an electronic transition laser and HF, DF, and HCl as vibrational laser systems. Both experimental and modeling results are described in this report. One of the most exciting aspects of this effort is the possibility of using diode lasers as excitation sources. Finally,...
Topics: DTIC Archive, Davis, Steven J., PHYSICAL SCIENCES INC ANDOVER MA, *INFRARED LASERS, *OPTICAL...
