| Q-Switched Evaluation of CaLaSOAP:Nd. |
15 SEP 1972 |
|
| Authors:
Gary D. Baldwin; WESTINGHOUSE DEFENSE AND ELECTRONICS CENTER BALTIMORE MD
|
 | This final technical report describes the results of a four-month program to investigate the thermo-optic and laser properties of Nd:LaSOAP as they relate to laser system design and operational characteristics. A major accomplishment of the program was the demonstration of E/O Q-switching of Nd:LaSOAP at high average output powers and the determination of average power and single pulse energy limitations. In addition, experimental investigations and tradeoff analyses were conducted which ... |
|
| Performance of Optical Proximity Fuzes in Degraded Atmospheres. |
SEP 1972 |
|
| Authors:
R. C. Anderson; T. G. McRae; FLORIDA UNIV GAINESVILLE DEPT OF AEROSPACE ENGINEERING
|
| The primary purpose of this program was to investigate reflected signals from atmospheric aerosols in order to ascertain their strength and to determine whether or not they were distinguishable from signals reflected from solid targets. The range degradation of the system due to the presence of various aerosol size distributions was also to be determined. Tests conducted during the program included system stability, receiver linearity, and target reflectivities. In addition, ... |
|
| A Laser Meteorological System Study. |
SEP 1972 |
|
| Authors:
Richard I. Ely; NAVAL WEAPONS LAB DAHLGREN VA
|
| A study was conducted to determine the feasibility of a meteorological system using a lidar (laser radar) for the remote and rapid measurement of atmospheric parameters. In particular, the feasibility of measuring air density and wind velocity was investigated. It was determined that air density could be measured best by physically measuring the air temperature profile and calculating the density from it. A coaxial laser Doppler system was chosen to ... |
|
| Semiconductor Pumps for the Nd:YAG Laser. |
JUL 1972 |
|
| Authors:
Eugene G. Dierschke; TEXAS INSTRUMENTS INC DALLAS COMPONENTS GROUP
|
| This report describes the major accomplishments and conclusions of a six-month program to develop light-emitting diodes suitable as pump sources for the Nd:YAG laser at room temperature. Work was concentrated on zinc-diffused Gal-xAlxAs 18-mil diameter dome emitters. Improved material and device technology resulted in an increased yield of emitters having a power efficiency of 4 to 5%, an optical output power of 17 to 21mW at 250mA, a wavelength of ... |
|
| Investigation of Hologram Techniques. |
JUL 1972 |
|
| Authors:
E. N. Leith; J. Upatnieks; MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY
|
| This is the final report on a variety of studies of hologram techniques. A summary of the work during the past six years is presented. Reported second are investigations of three areas of holography applications: three-dimensional light-line sights for aircraft heads-up displays; three-dimensional displays for air traffic control; and holographic information storage and display for aircraft. The feasibility of these applications was investigated, and preliminary experiments were performed. Third is ... |
|
| Three to 5-Micron Parametric Oscillator. |
MAY 1972 |
|
| Authors:
Eugene O. Ammann; GTE SYLVANIA INC MOUNTAIN VIEW CA ELECTRO-OPTICS ORGANIZATION
|
| This report summarizes the results of a twelve month program whose goal is the generation of infrared outputs in the 3-to-5-micron region. This program is a continuation of work started under contract F33615-69-C-1702. On the present program, internal optical parametric oscillators have been operated which have produced average powers of 1.8 watts at 2.1 microns and 200 mW at 3.1 microns. Tunable outputs greater than 500 mW were obtained from ... |
|
| Studies in Optics. |
MAR 1972 |
|
| Authors:
Brian Thompson; Michael Hercher; James M. Forsyth; David B. Dutton; Douglas C. Sinclair; ROCHESTER UNIV NY INST OF OPTICS
|
| The 'Studies in Optics' described are directed towards the assessment and improvement of laser output characteristics and to problems in the use of the coherent output of a laser in optical systems. Section 2 consists of a study of techniques for assessing and improving laser beam propagation characteristics including apodization of coherent imaging systems and holographic methods of measuring the amplitude and phase of pulsed laser beams. The design of ... |
|
| Ring Laser Techniques Investigation. Volume I. |
NOV 1971 |
|
| Authors:
F. Vescial; O. L. Watson; W. L. Zingery; AUTONETICS ANAHEIM CALIF
|
| This effort is significant to the Air Force in that an angular rate sensor is being developed that will eventually result in the production of a low-cost, reliable, strapdown inertial system. The results of a ring laser techniques investigation performed by Autonetics Division of North American Rockwell Corporation are presented in this document. The objective of the contract was to demonstrate laser gyro performance suitable for strapdown guidance and navigation ... |
|
| Ring Laser Techniques Investigation. Volume II. |
NOV 1971 |
|
| Authors:
F. Vescial; O. L. Watson; W. L. Zingery; AUTONETICS ANAHEIM CALIF
|
| Two techniques, both of which use the Faraday bias effect, were investigated for eliminating or reducing the lock-in effect. One technique, dual FM bias, is a passive scheme which uses two ac bias signals which drive the RLG through the lock-in region in such a manner that lock-in does not occur. Dual FM bias is discussed in Volume I. The second bias technique, servo-linearization, uses an active control technique for ... |
|
| Laser Mode Control and Nonlinear Optics. |
OCT 1971 |
|
| Authors:
J. A. Carruthers; R. J. Collins; MINNESOTA UNIV MINNEAPOLIS DEPT OF ELECTRICAL ENGINEERING
|
| Results are reported for work on coupled optical resonators, laser amplitude noise, phase locking, and nonlinear interactions. The propagation characteristics for low intensity pulses in the active gain medium of a laser have been studied both experimentally and theoretically. The pulse velocity is very nearly equal to the classical group velocity dw/dk, and is less than c for a gain medium and greater than c for a resonant absorber. In ... |
|
| Shock Excited FTIR Q-Switch. |
09 AUG 1971 |
|
| Authors:
Allen M. Erickson; NAVAL ORDNANCE LAB WHITE OAK MD
|
| A new high speed high power laser Q-Switch is described together with test results in a 100 megawatt ruby laser cavity. A frustrated total internal reflector (FTIR) is pulse driven by mechanical shockwave to produce fast switch action with good depth of modulation and low cavity insertion loss. Multiple Q-switching has been achieved at 200k p.p.s. during the laser pump cycle producing better than 80 Q-switched pulses in a half ... |
|
| Study to Improve Specific Physical and Optical Properties of Laser Protective Plastic Film. |
16 JUL 1971 |
|
| Authors:
Allan E. Sherr; Robert J. Tucker; W. F. Cordes III; AMERICAN CYANAMID CO BOUND BROOK NJ
|
| A formulation for a multipurpose 5 mil thick protective film was developed. The polyvinyl chloride film has optical densities in excess of 4 at 332, 337, 488, 515, 533, 694, 840-900, and 1060 nm. The luminous (visual) TRANSMITTANCE OF THE FILM IS 24-26%. Migration of absorbers from this new film has been reduced from that observed in the earlier LPA-30 film produced under Contract No. DA-36038-AMC-4287(A). The formulation should be ... |
|
| Laser Division Digest, Spring 1971. |
JUN 1971 |
|
| Authors:
AIR FORCE WEAPONS LAB KIRTLAND AFB NM
|
| The digest covers the unclassified high-energy laser research performed at the Air Force Weapons Laboratory during the 6 months ending 1 May 1971. This report includes individual technical contributions in the specific areas of laser systems and devices, optics, optical systems, propagation, and laser effects. (Author) |
|
| Quantum Electronics in Japan. |
JUN 1971 |
|
| Authors:
Fred W. Quelle Jr.; Irving Rowe; OFFICE OF NAVAL RESEARCH ARLINGTON VA
|
| A summary and an analysis of the status of quantum electronics in Japan is presented in this report. Advantage was taken of the fact that the Sixth International Quantum Electronics Conference was held in Kyoto in the period September 7 through 10, 1970. Two ONR scientists, Dr. Fred W. Quelle, Jr., of the Boston Branch Office and Dr. Irving Rowe of the New York Area Office, attended this meeting. After ... |
|
| Neodymium Aprotic Liquid Laser. |
MAY 1971 |
73 pages |
| Authors:
Jack D. Foster; Russell F. Kirk; GTE SYLVANIA INC MOUNTAIN VIEW CA ELECTRO-OPTICS ORGANIZATION
|
 | The report describes the results of a research and development program directed at achieving high average power operation from a transverse flow Nd:POCl3;ZrCl4 liquid laser. Theoretical calculation of expected performance predicted over 50 joules long pulse output at greater than 3 percent efficiency. Transverse flow was expected to allow operation at 10 Hz and higher. A flowing system was designed using materials compatible with the corrosive liquid. Many problems were ... |
|
| GaAsP Diode Pumped Nd: YAG Laser. |
22 APR 1971 |
|
| Authors:
Stanley J. Scalise; Raymond B. Allen; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The significance of this research and development to the Air Force is the demonstration of diode-pumped laser operation at noncryogenic temperatures. Operation at noncryogenic temperatures is an important requirement in most operational applications of interest. The design fabrication and evaluation of Nd:YAG lasers optically pumped with GaAsP light-emitting diodes at 0C are described. A comparison of close and focused coupling pump geometries is made for both CW and pulsed operation ... |
|
| Production Engineering Measure for Optical Integrators, Optical Windows and Projection Lenses for Laser Diode Arrays. |
APR 1971 |
|
| Authors:
Kurt G. Ewer; VALPEY CORP HOLLISTON MA OPTICAL SUB-SYSTEMS DIV
|
| The report covers the fabrication of the various sample materials. A typical sequence of operations is described and operation times are quoted. Transmission measurements prior to coating and for each type of coating applied to the various materials are shown as graphs. Designs of the different types of thin film coatings are described. The energy distribution of the collimating system is computed and shown on graphs. (Author) |
|
| Research and Development on High Power Laser Problems. |
APR 1971 |
|
| Authors:
F. M. Taylor; J. Brandelik; D. Smith; R. J. McBroom; A. Lombardo; SYSTEMS RESEARCH LABS INC DAYTON OH
|
| This final technical report shows the results of research and development of work conducted by Systems Research Laboratories, Inc.'s personnel in the facilities of the Air Force Avionics Laboratories, Laser Technology Research (TEL), in the following areas: Catalyzed CO2 laser, Low power optical lasers, Solid state lasers, Molecular lasers, CO and CO2, Raman-shifted lines of atmospheric gases using a pulsed nitrogen laser, and Vortex tube laser. The experimental details and ... |
|
| Glass Clad Ruby. |
APR 1971 |
|
| Authors:
Richard F. Cooley; OWENS-ILLINOIS INC TOLEDO OH CONSUMER AND TECHNICAL PRODUCTS DIV
|
| The objective of this study was to determine the feasibility of fabricating glass clad ruby slabs of high optical quality and good mechanical characteristics for use in axial gradient laser systems. A theoretical examination of the factors involved in cladding ruby with glass was carried out. The solarization resistance of two alumina sealing glasses were measured using a Beckman DK2 recording spectrophotometer. Two 1/2 in. x 6 in. ruby rods ... |
|
| GaAs Degradation. |
APR 1971 |
|
| Authors:
Henry Kressel; Henry S. Sommers Jr.; Harry F. Lockwood; Michael Ettenberg; RCA LABS PRINCETON NJ
|
| A comprehensive investigation has been concluded of the physics of GaAs laser diode failure and techniques to improve their reliability. Gradual degradation has been shown to depend partly on the structural perfection of the devices, and modifications of the close-confinement single heterojunction (AlGa)As-GaAs diodes have now yielded laboratory devices with reasonably stable performance over several thousand hours at duty cycles of 0.04% operating at 300 to 400 W/cm of facet. ... |
|
| Solid State Infrared Laser Devices. |
NOV 1970 |
|
| Authors:
Viktor Evtuhov; Donald P. Devor; Bernard H. Soffer; Morton Robinson; HUGHES RESEARCH LABS MALIBU CA
|
| The objectives of the research are to carry out investigations of laser materials and devices operating in the spectral region between 2.0 and 2.4 micro m with the goal of obtaining efficient, high power continuous and repetitively Q-switched laser operation. The report describes the study of the applicability to 2.1 micro m laser devices of calcium erbium fluoride host (Ca2Er5F19) with Ho(3+) as an active ion and sensitized with Tm(3+). ... |
|
| Laser-Hologram Multicolor Moving Map Display System. |
NOV 1970 |
|
| Authors:
Gardner T. Burton; Burton R. Clay; Richard F. Croce; Douglas A. Gore; RCA ADVANCED TECHNOLOGY LABS BURLINGTON MA
|
| The report describes the results of the work performed under an exploratory development program designed to establish the techniques required to present a multicolor moving map display to a pilot in an aircraft cockpit environment. A system for producing a full color display 6 inches in diameter with the provision for translating and rotating the image has been postulated and its feasibility demonstrated. Methods of presenting symbols on the display ... |
|
| Mode-Locked, Frequency-Doubled Neodymium Laser. |
NOV 1970 |
|
| Authors:
J. H. Boyden; E. G. Erickson; R. Webb; HOLOBEAM INC PARAMUS NJ LASER PRODUCTS DIV
|
| Investigations were conducted in the areas of second harmonic generation and mode locking with CW neodymium:YAG Lasers. Demonstration of consistent and reproducible 100% conversion of the available CW power at 1.06 microns into 0.53 micron power was accomplished at a level of 2.1 watts in the TEM(oo) mode. A completely electronic closed loop automatically stabilized mode-locking system was developed, with capability of tracking plus or minus 1.5% variations in cavity ... |
|
| Techniques for Achieving High Power Q-Switched Operation in YAG:Nd. |
04 MAY 1970 |
|
| Authors:
Thomas G. Crow; Thomas J. Snyder; INTERNATIONAL LASER SYSTEMS INC ORLANDO FL
|
| The report describes the results of a six months program to experimentally determine the degree of improvement to the state of the art of Q-switched neodymium lasers made possible by the use of 1.06 micron radiation absorbing filters placed within the laser pump cavity. The program experimentally studied the individual energy storage capabilities of individual YAG:Nd rods of dimensions up to 0.75 inch diameter by 4.0 inches long and the ... |
|
| GaAsP Diode-Pumped Nd:YAG Laser. |
30 APR 1970 |
|
| Authors:
Stanley J. Scalise; Raymond B. Allen; TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
|
| The use of spontaneous, GaAsP light-emitting diodes for CW optical pumping of Nd:YAG lasers was investigated. Two diode-pumped lasers were constructed and successfully operated at liquid nitrogen temperatures (77K). CW laser outputs of 130 mW and 430 mW were obtained at 1.06 micrometers with power efficiencies of 1.23 percent and 1.02 percent, respectively. The importance of the spectral match between the laser material absorption characteristics and the GaAsP array output ... |
|
| Atmospheric Effects upon Laser Eye Safety. Part I. |
APR 1970 |
113 pages |
| Authors:
Warren B. Johnson; William E. Evans; Edward E. Uthe; STANFORD RESEARCH INST MENLO PARK CA
|
| The results of two laser scintillation experiments in the atmosphere are presented, as is a revised laser eye-hazard evaluation procedure incorporating these results. The objective of the research is to determine the influence of atmospheric thermal turbulence on laser eye safety. The experimental work on a 3.5-km near-ground horizontal propagation path was designed to determine the effect of range upon laser scintillation magnitude, represented by the log intensity standard deviation ... |
|
| Evaluation of AN/GVS-3 Laser Range Finder. |
24 MAR 1970 |
|
| Authors:
David H. Sliney; Benjamin C. Freasier; ARMY ENVIRONMENTAL HYGIENE AGENCY ABERDEEN PROVING GROUND MD
|
| A special study of the health hazards associated with the use of the AN/GVS-3 laser range finder was conducted. After consideration of the irregular laser beam pattern, the great variation in the hazardous range of the device, and the problems associated with the use of optical viewing instruments downrange, it was concluded that the designation of a single hazardous range for firing range safety purposes was not feasible in most ... |
|
| Laser Non-Scanning Techniques Feasibility Study. |
FEB 1970 |
|
| Authors:
Bob V. Markevitch; Jacob van Heeckeren; Ralph Olenick; AMPEX CORP REDWOOD CITY CA
|
| The purpose of the work carried out was proof of feasibility of recording 24,000,000 bits of digital information into a dedicated area of 0.25 inch x 4 inch near the top of a COSATI format microfiche by recording 667 holograms at 3600 bits each. The effort is centered around the concept of writing the information in holographic form rather than bit-by-bit. In this scheme, the digital information is grouped into ... |
|
| CW YAG Laser. |
JAN 1970 |
|
| Authors:
Larry M. Osterink; SYLVANIA ELECTRONIC SYSTEMS-WEST MOUNTAIN VIEW CA
|
| A high average power CW Nd:YAG laser has been built and is described. This laser has been operated with both tungsten and krypton pump lamps, with superior performance occurring during krypton pumping. Measurements of the thermal properties (thermal focusing and birefringence) of krypton-pumped Nd:YAG lasers are presented. Also presented are the results of a variety of experiments aimed at compensating for the thermally induced birefringence in Nd:YAG laser rods. To ... |
|
| PICOSECOND LASER PULSES. |
29 DEC 1969 |
23 pages |
| Authors:
Anthony J. DeMaria; William H. Glenn; Michael E. Mack; E. Brain Treacy; UNITED AIRCRAFT CORP EAST HARTFORD CONN RESEARCH LABS; UNITED AIRCRAFT CORP EAST HARTFORD CONN RESEARCH LABS
|
| The report describes experimental investigations of stimulated rotational and vibrational Raman scattering in gases, analytical investigations of nonlinear propagation effects in Kerr active liquids and a discussion of the generation of Cerenkov radiation by light pulses. (Author) |
|
| Alkali-Vapor Light Sources as Optical Pumps for Nd: YAG. |
NOV 1969 |
|
| Authors:
William T. Bayha; John E. Creedon; Sol Schneider; ARMY ELECTRONICS COMMAND FORT MONMOUTH NJ
|
| Pulse-operated light sources containing cesium (Cs), rubidium (Rb), potassium (K), sodium (Na), and a Na-Rb mixture were evaluated for efficiency as optical pumps for Nd:YAG. The results are compared with those obtained from conventional xenon (Xe) and krypton (Kr) flashlamps. The Na-Rb mixture has a maximum efficiency over the four broad pumping regions of Nd: YAG that is twice as large as that of Xe, when operated under similar conditions ... |
|
| Stimulated Emission in the Near Field. |
21 OCT 1969 |
|
| Authors:
T. A. DeTemple; NAVAL ELECTRONICS LAB CENTER SAN DIEGO CA
|
| Within a program of study of the properties of optical systems and devices as related to signal and data processing, the effect of the nonradiative fields of a radiating atom on the process of stimulated emission of a second atom was considered. It is first demonstrated that the quantized vector potential contains all the dynamic fields associated with a radiative transition. The stimulated emission probability for an excited atom in ... |
|
| Raman Scattering in Semiconductors. |
SEP 1969 |
|
| Authors:
Richard K. Chang; James M. Ralston; YALE UNIV NEW HAVEN CT DUNHAM LAB
|
| The report concerns the initial stages of an investigation into stimulated Raman effect on mixed crystals. Spontaneous Raman studies were conducted first to determine the lattice vibrations of the mixed crystals and of other semiconductors. The Raman linewidths of the L0 and T0 modes for GaAs and that of the triply degenerate mode for Si were measured from 10 degrees K to 475 degrees K. A pronounced increase in the ... |
|
| Laser Radiance Measurements. |
29 AUG 1969 |
|
| Authors:
J. N. Ferrer; D. F. Hotz; NAVAL ELECTRONICS LAB CENTER SAN DIEGO CA
|
| Beam radiance or radiant brightness for a laser is defined and discussed, and the radiometric quantities required to discuss radiance measurement are defined. The importance of etendue is emphasized. The divergence and etendue of a fundamental spatial mode for a laser cavity are found and expressions for the 'near field' and 'far field' of this spatial mode are given. The etendue of higher order spatial modes is compared to the ... |
|
| THE EXCITATION OF A GENERATOR-AMPLIFIER SYSTEM, |
22 MAY 1969 |
|
| Authors:
E. P. Chechenina; I. R. Katseva; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
|
| The authors calculate the emission produced by a generator-amplifier system with allowance for their mutual influence (i.e., the feedback between the generator and the amplifier), for different parameters of the active medium and of the resonator. The properties of such a system are compared with those of a system in which the quantum generator and the quantum amplifier are considered separately, so as to determine the region of parameters ... |
|
| The Use of a Controlled Optical Resonator for Measurements in the Laser Field, |
26 MAR 1969 |
|
| Authors:
B. Popela; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
|
| The article is dedicated to an analysis of the properties of a controlled open resonator with spheric mirrors and its application for measurements in the laser field. The requirements for measurement optimization are stated. From the experimental results the advantage is deduced of applying the resonators for measuring the frequency spectra of lasers and of passive optical resonators, for determining the quality of laser elements and for using an interferometer ... |
|
| A Spectroscopic Comparison of Holmium Laser Host Materials. |
FEB 1969 |
|
| Authors:
Herbert A. Briesacher; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Four crystals YLiF4:Ho(3+) 0.5%; YLiF4:Er(3+) 5%, Ho(3+) 2%; Er2O3:Ho(3+); ABC:YAG) were spectroscopically compared for possible use as 2.1 microns laser materials. The crystals were compared by means of fluorescence, absorption, and selective excitation spectroscopy at 295 and 77K. The best indicator of the efficiency of crystals to convert pump energy to a particular lasing transition is selective excitation spectroscopy. YLF:Ho(3+) is the least promising laser material because of its very ... |
|
| HOLOGRAPHIC TECHNIQUES FOR THE STUDY OF DYNAMIC PARTICLE FIELDS. |
NOV 1968 |
|
| Authors:
J. D. Trolinger; R. A. Belz; W. M. Farmer; ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AIR FORCE STATION TENN
|
| A brief review of the techniques of small-particle holography is presented. These results are extended in an elementary way to show that multiple-exposure holography can be used to study the dynamic properties of particle fields. Experimental techniques for performing such a study are then described. Finally, as a typical example, a multiple-exposure hologram of an aerosol is presented with a portion of the data extracted from it. The hologram exhibits ... |
|
| A Frequency Scanning Fabrey-Perot Laser Q-Switch, |
11 SEP 1968 |
|
| Authors:
Allen M. Erickson; NAVAL ORDNANCE LAB WHITE OAK MD
|
| A new laser Q-switch (named the 'Erick Q-Switch') has been developed as an engineering model that operates on the principle of optical interference. When it is substituted as one end mirror of a laser cavity, it functions as a variable reflector to Q-switch the laser on command of an electrical pulse. Tests on ruby and neodymium cavities, two of the many rare earth and noble gas lasers within its scope ... |
|
| Electron Injection Laser. |
SEP 1968 |
|
| Authors:
J. C. Marinace; F. F. Morehead; F. Stern; J. M. Woodall; IBM THOMAS J WATSON RESEARCH CENTER YORKTOWN HEIGHTS NY
|
| This report covers in detail the work carried out in the fourth and final semiannual period of the contract, and summarizes the work described in the three prior semiannual reports. Epitaxial growth of Ga(1-x)Al(x)As has been successful over a wide range of values of x, and for junctions and structures with both uniform and graded composition. The electrical, optical, and luminescent properties of the resulting materials have been studied, particularly ... |
|
| Spectral Properties of Passively Q-Spoiled Lasers. |
30 JUL 1968 |
|
| Authors:
Bernard H. Soffer; UNION CARBIDE CORP SANTA MONICA CA KORAD DEPT
|
| Description of experiments bearing on the problems of the spectral behavior of passive Q-switched lasers and of the physical behavior of passive Q-spoiling materials are given. The results of experiments of the temporal and frequency locking of two lasers, coupled in a bleachable dye are described. Further experiments pertinent to the problem of spectral cross-relaxation are described. The stimulated emission of several organic dyes in the visible spectrum and the ... |
|
| LASER HAZARDS. |
JUL 1968 |
|
| Authors:
Victor P. Bond; Leonard A. Baker Jr; NAVAL TRAINING DEVICE CENTER ORLANDO FL
|
| The report contains a general development of why lasers are dangerous. It is intended to be a source of safety guidelines for laser laboratory personnel. Laser hazards are analyzed from a biophysical standpoint and laser safety recommendations are proposed. A short history of laser safety is given and fifty references are cited. The latest damage threshold numbers are listed based on the laser safety conference at the University of Cincinnati ... |
|
| UP-CONVERSION OF A LASER-INDUCED QUASI-CONTINUUM (THE RAINBOW LASER), |
JUN 1968 |
|
| Authors:
M. D. Martin; E. L. Thomas; SIGNALS RESEARCH AND DEVELOPMENT ESTABLISHMENT CHRISTCHURCH (ENGLAND)
|
| A method is described whereby a relatively narrowband (8/cm) source of radiation, which is tunable over most of the visible and near infrared spectral regions, can be generated. Tuning curves and power/wavelength curves are presented. The dependence of tunable output power on crystal length was also investigated. This latter investigation provided indirect evidence for the phenomenon of beam-trapping. The mechanism and potential of this tunable source are discussed. (Author) |
|
| HYPERSOUND FROM ELECTROSTRICTIVE BEATING OF LONGITUDINAL LASER MODES. |
JUN 1968 |
|
| Authors:
Norval Leon Wardle; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A new method for generating pulses of hypersound by electrostrictive beating of two coherent light beams has been demonstrated. Three new procedures for generating the two required beams with a precise and predictable difference between their frequencies have been experimentally investigated. In the most practical of these a giant pulse ruby laser was forced to emit light at two frequencies. Techniques to control the difference between the two frequencies have ... |
|
| PERFORATION OF PLASTIC FILMS WITH CARBON DIOXIDE LASER RADIATION. |
24 MAY 1968 |
|
| Authors:
H. S. Silvus Jr.; robert l. bond; SOUTHWEST RESEARCH INST SAN ANTONIO TEX
|
| Perforation of the plastic film which forms the walls of a salt pellet sub-pack was accomplished using the focused beam from a carbon dioxide laser operating at 10.6 microns wavelength in the TEMoo mode. Typical hole sizes were 6 to 12 mils in diameter with two holes punched simultaneously, one in each of two layers of plastic film separated by approximately 0.2 inch. The holes thus obtained were clear of ... |
|
| STUDY OF OPTICAL INTERACTIONS IN SOLIDS. |
MAY 1968 |
69 pages |
| Authors:
R. Braunstein; J. P. Biscar; S. Gratch; M. Welkowsky; CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS
|
| Multiphoton absorption in semiconductors was investigated with emphasis on the III-V compounds. It was shown that this mechanism can set an intrinsic upper limit to the power density transmittible through semiconductors. This mechanism is an effective means of optically pumping semiconductor lasers, can limit the power density obtainable from such devices, or can enable the fashioning of nonlinear optical elements. Laser action in a large volume of Ga As was ... |
|
| THE RESEARCH PROGRAM OF THE APPLIED PHYSICS DEPARTMENT FOR THE YEAR 1967, |
15 APR 1968 |
|
| Authors:
W. W. Scanlon; NAVAL ORDNANCE LAB WHITE OAK MD
|
| The report summarizes the progress made in basic and applied solid state research in the Applied Physics Department of the U.S. Naval Ordnance Laboratory during 1967. The fields of research covered are metallic and non-metallic magnetic materials, semiconductors, infrared, and metallurgy. (Author) |
|
| CO2 LASER INDUCED SKIN LESIONS. |
13 MAR 1968 |
25 pages |
| Authors:
Arnold S. Brownell; Wordie H. Parr; David K. Hysell; Robert S. Dedrick; ARMY MEDICAL RESEARCH LAB FORT KNOX KY
|
| Depilated skin of white pigs was exposed to different exposure time-irradiance combinations using CO2 laser radiation (10.6 microns). The lesions produced ranged from a mild erythema to partial tissue coagulation. The probability of producing a particular grade of lesion was then established for power densities within the range of 0.69-13.6 watts/sq. cm and exposure times of 0.2 to 40 sec. Data obtained are adequate to establish laser safety standards. A ... |
|
| Mechanisms of Energy Transfer in Solids and Gases. |
1968 |
|
| Authors:
John F. Porter Jr.; Charles L. Dodson; ALABAMA UNIV IN HUNTSVILLE RESEARCH INST
|
| Contents: Non-radiative transitions of ions in crystals resulting from cooperative phenomena; and Influence of additives upon the resonance radiation of excited carbon dioxide. |
|
| Prismatic Optical Resonator for Laser. |
1968 |
|
| Authors:
V. K. Ablekov; ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER CHARLOTTESVILLE VA
|
| A prismatic optical resonator for a laser is formed from two prisms whose bases are inclined at the Brewster angle to the resonator axis, in order to eliminate loss of light by reflection and increase the radiative stability of the laser. In order to reduce the scatter region and obtain confocality, one prism is a transformed tripole with the plane of the base inclined at the Brewster angle to the ... |
|
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