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Techniques for preventing damage to high power laser components

Description: Techniques for preventing damage to components of the LASL Shiva high power laser system were briefly presented. Optical element damage in the disk amplifier from the combined fluence of the primary laser beam and the Xenon flash lamps that pump the cavity was discussed. Assembly and cleaning techniques were described which have improved optical element life by minimizing particulate and optically absorbing film contamination on assembled amplifier structures. A Class-100 vertical flaw clean ro… more
Date: September 1, 1977
Creator: Stowers, Irving F.; Patton, Howard G.; Jones, Walter A. & Wentworth, Donald E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Design studies of a laser fusion power plant

Description: The conceptual design of a laser fusion power plant has been undertaken to exploit recent developments in target design. Advanced high-gain targets which have been developed make it possible to significantly relax the laser and optical system requirements. The power plant design features a reactor concept which utilizes a thick falling region of liquid lithium to protect the first-wall from the neutrons, x-rays, and charged particles that are produced in the thermonuclear microexplosion. The li… more
Date: October 7, 1977
Creator: Maniscalco, J. A.; Meier, W. R. & Monsler, M. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Requirements and new materials for fusion laser systems

Description: Higher focusable power in neodymium glass fusion lasers can be obtained through the use of new materials with lower nonlinear index (n/sub 2/) and better energy storage capabilities than the presently employed silicate glass. Silicate, phosphate, fluorophosphate, and beryllium fluoride glasses are discussed in terms of fusion laser requirements, particularly those for the proposed Nova laser. Examples of the variation in spectroscopic and optical properties obtainable with compositional changes… more
Date: October 1, 1977
Creator: Stokowski, S. E.; Weber, M. J.; Saroyan, R. A. & Hagen, W. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Beam transport optics for laser fusion

Description: The performance of large laser systems for laser fusion is limited by self-induced damage to optical components, arising from the interaction of the intense light with the optical materials in the laser system. In the design of the beam transport optics, due consideration must be given to high intensity effects, including self-focusing, surface damage, and internal reflection focusing. The constraints imposed on the design of optical components by these considerations are discussed.
Date: October 1, 1977
Creator: Glass, A.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optical design considerations for laser fusion reactors

Description: The plan for the development of commercial inertial confinement fusion (ICF) power plants is discussed, emphasizing the utilization of the unique features of laser fusion to arrive at conceptual designs for reactors and optical systems which minimize the need for advanced materials and techniques requiring expensive test facilities. A conceptual design for a liquid lithium fall reactor is described which successfully deals with the hostile x-ray and neutron environment and promises to last the … more
Date: September 1, 1977
Creator: Monsler, M.J. & Maniscalco, J.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Damage resistance of AR-coated germanium surfaces for nanosecond CO/sub 2/ laser pulses

Description: An evaluation of the state-of-the-art of AR coatings on gallium-doped germanium, used as a saturable absorber at 10.6 ..mu..m, has been conducted. Both 1-on-1 and N-on-1 laser damage thresholds were measured with 1.2 ns pulses on bare and coated surfaces. Only front surface damage was observed. With few exceptions, the thresholds for coated surfaces were centered at 0.49 +- 0.3 J/cm/sup 2/. Bare Ge had a threshold ranging from 0.65 to 0.70 J/cm/sup 2/. No significant differences due to substrat… more
Date: January 1, 1977
Creator: Newnam, B.E. & Gill, D.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Fluorescence-pumped photolytic gas laser system for a commercial laser fusion power plant

Description: The first results are given for the conceptual design of a short-wavelength gas laser system suitable for use as a driver (high average power ignition source) for a commercial laser fusion power plant. A comparison of projected overall system efficiencies of photolytically excited oxygen, sulfur, selenium and iodine lasers is described, using a unique windowless laser cavity geometry which will allow scaling of single amplifier modules to 125 kJ per aperture for 1 ns pulses. On the basis of hig… more
Date: July 14, 1977
Creator: Monsler, M.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Damage history of Argus, a 4TW Nd-glass system

Description: Argus is a twin beam, 20 cm output aperture, Nd:glass laser system that has delivered 4TW to a laser fusion target. This performance is based on the concepts that multiple spatial filtering can prevent beam fill factors. Damage to optics due to self focusing and filamentation does not occur on Argus. The only form of damage is induced by broadband radiation from xenon flashlamps interacting with contaminants on or in the Nd:glass. The severity of damage is measured by the fraction of the beam o… more
Date: December 6, 1977
Creator: Stowers, I.F. & Patton, H.G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Air driven fiber optic coupled pulser system for ZT-40

Description: The design, construction, and operation of an air powered fiber optic coupled pulser system for initiating various high-voltage systems in the ZT-40 experiment is displayed. The air fiber optic system provides complete electrical isolation of the experimental high-voltage circuits from the digital timing and control circuits. In addition, this pulser system prevents cross talk between individual output channels and eliminates trigger system ground loops. The system uses an additional fiber opti… more
Date: January 1, 1977
Creator: Nunnally, W.C. & Brousseau, A.T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Will lightwave communications be useful

Description: Within the last ten years or so, glass fibers have been developed that are capable of transmitting optical signals over distances that are long enough to have potential use for many kinds of communications. They may replace wires, coaxial cable, and microwave links in many applications, and some forecasters expect them to do so within the next ten years or so. A technology assessment of lightwave communication systems is presented.
Date: January 1, 1977
Creator: Thorndike, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Construction of a large laser fusion system

Description: Construction of a large laser fusion machine is nearing completion at the Lawrence Livermore Laboratory (LLL). Shiva, a 20-terawatt neodymium doped glass system, will be complete in early 1978. This system will have the high power needed to demonstrate significant thermonuclear burn. Shiva will irradiate a microscopic D-T pellet with 20 separate laser beams arriving simultaneously at the target. This requires precise alignment, and stability to maintain alignment. Hardware for the 20 laser chai… more
Date: January 1, 1977
Creator: Hurley, C.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Feasibility investigation and design study of optical well logging methods for high temperature geothermal wells. Final report

Description: The results are reported of a one-year program designed to investigate the feasibility of optical techniques applied to well-logging, to extend measurement capabilities in high-temperature geothermal boreholes. The basic concept is shown schematically. It makes use of a special armored cable containing fiber optic wave guides, connected to passive, downhole optical transducers. The latter modulate an optical carrier in response to borehole parameters. The optical carrier is a beam of infrared l… more
Date: December 1, 1977
Creator: Swanson, R. K.; Anderson, R. E.; Ash, J. I.; Beissner, R. E. & Smith, V. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pantex Model 121 Streak Camera

Description: The internal optical system for the Pantex Model 121 Streak Camera was optimized at 1:1 magnification using tools and methods currently available at Pantex. The system performs well, with slight vignetting at small magnification (0.2) with small apertures (0.6 cm or less with 107 cm focal length objective lens).
Date: October 1, 1977
Creator: West, G.T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research studies on short optical pulse generation for the laser fusion program. Final report, 11 January 1976--11 March 1977

Description: The single pulse energy that can be expected from a Nd:YAG laser was calculated. The factors limiting the pulse energy are discussed. It was shown that single pulse energies in the range of 0.1 to 1 mJ can reasonably be expected from this type of laser, with Nd:YAG as the active medium. (MOW)
Date: March 30, 1977
Creator: Kuizenga, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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SHIVA laser: nearing completion

Description: Construction of the Shiva laser system is nearing completion. This laser will be operating in fall 1977 and will produce over 20 terawatts of focusable power in a subnanosecond pulse. Fusion experiments will begin early in 1978. It is anticipated that thermonuclear energy release equal to one percent that of the incident light energy will be achieved with sub-millimeter deuterium-tritium targets. From other experiments densities in excess of a thousand times that of liquid are also expected.
Date: May 12, 1977
Creator: Glaze, James A. & Godwin, Robert O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Optical engineering problems associated with construction of the Shiva Laser Fusion Facility

Description: The Shiva laser system is part of a new 20 terawatt laser facility at Lawrence Livermore Laboratory. The system contains more than $5,000,000 worth of optics. This paper discusses the various optical components, typical component quantities and specification, and the problem of laser damage to components.
Date: August 24, 1977
Creator: Godwin, R. O.; Bliss, E. S.; Glaze, J. A.; O'Neal, W. C.; Patton, H. G.; Summers, M. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Exploratory development of fusion cast calcium fluoride for 1. 06 micrometer pulsed laser optics. Progress report, December 25, 1976--March 25, 1977

Description: This program is an assessment of fusion cast polycrystalline calcium fluoride for optical components of 1.064 micrometer pulsed laser fusion systems. Task areas include casting of essentially stress-free 33 centimeter diameter, 5 centimeter thick ingots, developing surface finishing techniques for optically figured plane and spherical surfaces, and evaluating state-of-the-art antireflection coatings deposited onto specimens of the cast material. During the third quarter, three casting runs were… more
Date: April 1, 1977
Creator: Willingham, C. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pulse Synchronization System (PSS)

Description: This document is intended to serve as an operations manual, as well as a documentation of the backup analyses pertinent to the design as delivered. A history of earlier unsuccessful versions of the Pulse Synchronization System (PSS) is not included. The function of the PSS is to synchronize the time of arrival at the fusion target of laser pulses that are propagated through the 20 amplifier chains of the SHIVA laser. The positional accuracy requirement is +-1.5 mm (+-5 psec), and is obtained by… more
Date: June 1, 1977
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Conceptual design and systems analysis of photovoltaic power systems. Final report. Volume V. Additional studies

Description: In the first of four tasks, the performances of autonomous (stand-alone) residences were determined in seven locations throughout the country. A non-autonomous residence must obtain its supplemental energy from a utility. The second task dealt with considerations of the rate to be charged by the utility for this energy in an effort to define the pertinent issues of this utility/residence interface. In the third task, the configuration of a fixed linear Fresnel lens provided with a tracking abso… more
Date: March 1, 1977
Creator: Pittman, P.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Microprocessor controller for stepping motors

Description: A new concept for digital computer control of multiple stepping motors which operate in a severe electromagnetic pulse environment is presented. The motors position mirrors in the beam-alignment system of a 100-kJ CO/sub 2/ laser. An asynchronous communications channel of a computer is used to send coded messages, containing the motor address and stepping-command information, to the stepping-motor controller in a bit serial format over a fiber-optics communications link. The addressed controlle… more
Date: January 1, 1977
Creator: Strait, B. G. & Thuot, M. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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General Chemistry Division quarterly report, October--December 1976

Description: Reported are: determination of imperfections on a laser spatial-filter lens; oxidation of U in O/sub 2/--N/sub 2/ mixtures; use of polarized x-rays to improve detection limits in energy-dispersive x-ray fluorescence analysis; detection of less than 1 ppT of organic compounds by laser-induced molecular fluorescence; a Stark-shift laser spectrometer; photoionization thresholds of Nd, Sm, Eu, Dy, and Er; response tests of chloride ion-selective electrodes; chemical analyses of explosive composites… more
Date: March 9, 1977
Creator: Harrar, J. E. & Lentzner, H. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Optical components for the SHIVA laser

Description: SHIVA, the 10-kilojule Neodymium-glass laser for the High Energy Laser Facility at Lawrence Livermore Laboratory has been built, exceeded minimum energy predictions, and is currently being applied to laser fusion experiments. The twenty, 20-cm aperture arms contain a total of about 1500 optical components for beam propagation, and another 1000 elements are used for control systems and diagnostics. In order to focus the energy on targets smaller than 1 mm in diameter, it has been necessary to ma… more
Date: December 22, 1977
Creator: Wallerstein, E. P.; Marchi, F. T.; Whistler, W. T. & Bissinger, H. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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