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in subjects: "Optical Systems"

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Measurements of the dependence of damage thresholds on laser wavelength, pulse duration and film thickness

Results of three experiments will be described. We used 351-nm and 355-nm pulses with durations of 0.6, 1, 5 and 9 ns measure thresholds for a variety of anti-reflectance and high reflectance coatings. The functional form t/sup m/, with t the pulse duration, was used to scale fluence thresholds measured at 0.6 ns to those measured at 9.0 ns. Values of the coefficient m ranged from 0.10 to 0.51. The average value was 0.30. In the second experiment, we measured thresholds at 1064 nm, 527 nm and 3… more

Date: March 1, 1984

Creator: Rainer, F.; Vercimak, C.L.; Milam, D.; Carniglia, C.K. & Tuttle Hart, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Potential for efficient frequency conversion at high average power using solid state nonlinear optical materials

High-average-power frequency conversion using solid state nonlinear materials is discussed. Recent laboratory experience and new developments in design concepts show that current technology, a few tens of watts, may be extended by several orders of magnitude. For example, using KD*P, efficient doubling (>70%) of Nd:YAG at average powers approaching 100 KW is possible; and for doubling to the blue or ultraviolet regions, the average power may approach 1 MW. Configurations using segmented apertur… more

Date: October 28, 1985

Creator: Eimerl, D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Optical design and performance of the X25 hybrid wiggler beam line at the NSLS

The X25 beam line at the National Synchrotron Light Source (NSLS) began full-power commissioning in 1990. It extracts radiation from a 27 pole hybrid wiggler, which produces up to 1.8 kW of total power with a peak horizontal density of 450 W/mrad and critical energy of 4.6 keV. The design and performance of the beam line optics are described, in particular the cooling of the first monochromator crystal. 28 refs., 5 figs.

Date: January 1, 1991

Creator: Berman, L. E.; Hastings, J. B.; Oversluizen, T. & Woodle, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Ultraviolet imaging of hydrogen flames

We have assembled an ultraviolet-sensitive intensified camera for observing hydrogen combustion by imaging the OH, A/sup 2/..sigma.. - X/sup 2//Pi/ bandhead emissions near 309 nm. The camera consists of a quartz and CaF achromat lense-coupled to an ultraviolet image intensifier which is in turn fiber-coupled to a focus projection scan (FPS) vidicon. The emission band is selected with interference filters which serve to discriminate against background. The camera provides optical gain of 100 to … more

Date: January 1, 1988

Creator: Yates, G. J.; Wilke, M. & King, N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Techniques for preventing damage to high power laser components

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: Article

Partner: UNT Libraries Government Documents Department

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Diamond-turning tool setting by interferogram analysis

A method was developed to establish a numerically controlled tool path with respect to the work spindle centerline. Particularly adapted to the diamond turning of optics, this method is based upon interferogram analysis and is applicable to the establishment of the work spindle centerline relative to the tool path for any center-turned optic having a well-defined vertex radius of curvature. The application reported is for an f/2 concave spherical mirror.

Date: October 22, 1980

Creator: Rasnick, W.H. & Yoder, R.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Phased-array antenna control by a monolithic photonic integrated circuit, COMPASS

Phased-array antenna systems are well known for rapid beam steering and their ability to bring high power to the target. Such systems are also quite complex and heavy, which have limited their usefulness. The issues of weight, size, power use, and complexity have been addressed through a system named COMPASS (Coherent Optical Monolithic Phased Array Steering System). All phased-array antenna systems need: (1) small size; (2) low power use; (3) high-speed beam steering; and (4) digitally-control… more

Date: January 1, 1991

Creator: Kravitz, S. H.; Hietala, V. M.; Vawter, G. A. & Meyer, W. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Optical imaging diagnostics for fusion plasmas

Imaging diagnostics are used for spatially/emdash/and temporally/emdash/resolved quantitative measurements of plasma properties such as the ionization particle source, particle and energy loss, and impurity radiation in magnetically confined fusion plasmas. Diagnostics equipped with multi-element solid-state detectors (often with image intensifiers) are well suited to the environment of large fusion machines with high magnetic field and x-ray and neutron fluxes. We have both conventional (16msf… more

Date: April 1, 1988

Creator: Allen, S.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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NOVA integrated alignment/diagnostic sensors

Under Contract 3772003 to the Lawrence Livermore Laboratory, Aerojet ElectroSystems Company has investigated a number of alignment system design topics for the NOVA and SHIVA upgrade lasers. Prior reports dealt with the Main Beam Alignment System, and with Multipass Amplifier Alignment Concepts. This report, which completes the contract, examines ways in which the Return Beam Diagnostic (RBD) package and Incident Beam Diagnostic (IBD) packages may be reconfigured to a more integrated package. I… more

Date: January 18, 1978

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Design studies of a laser fusion power plant

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: Article

Partner: UNT Libraries Government Documents Department

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Optical components for the Nova laser

In addition to its other characteristics, the Nova Laser Fusion facility may well be the largest precision optical project ever undertaken. Moreover, during the course of construction, concurrent research and development has been successfully conducted, and has resulted in significant advances in various technical areas, including manufacturing efficiency. Although assembly of the first two beams of Nova is just commencing, the optical production, including construction of the special facilitie… more

Date: May 17, 1982

Creator: Wallerstein, E.P.; Baker, P.C. & Brown, N.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Laser fusion study. Final report

The following appendices are included: (1) sensor performance calculation techniques, (2) focus sensing, (3) purchased item data, (4) pointing and focusing configuration tradeoff studies, (5) false start centering sensor, (6) RCA application notes on quad delection, (7) elliptical flex pivot analysis, (8) servo mirrors cross coupling, (9) optical misalignment analysis, (10) stress induced birefrigent quarter-wave retarder, (11) data bulletin on incramute damping alloy, (12) the utilization of s… more

Date: June 1, 1975

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Requirements and new materials for fusion laser systems

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: Article

Partner: UNT Libraries Government Documents Department

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Phase Transformations in Alumina. Technical Report, May to December 1961

e transformation studies showed that synthetic aluminas produced in the laboratory were not transformed to alpha alumina at 400 to 700' deg n the presence of nitric acid and water vapor. Amorphous aluminn produced in the pilot plant was transformed to alpha alumina. This indicated that the amorphous alumina produced in the pilot plant is structurally predisposed to form alpha alumina. Most additives did not appear to have any special effects. Lithium formed zeta alumina, LiAl/sub 5/O/sub 8/. Ph… more

Date: December 1, 1961

Creator: Eding, H J; Huggins, M L & Brown, A G

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The Soviet applied information sciences in a time of change

The Foreign Applied Sciences Assessment Center (FASAC) conducts reviews of selected areas of foreign basic and applied science by US scientists who are technically expert and active in the fields reviewed. Several of the FASAC assessments of Soviet science have involved various aspects of the information sciences, including enabling technologies and applications, as well as the core information sciences. This report draws upon those FASAC assessment reports, the expert judgment of some of the a… more

Date: July 1, 1991

Creator: Bengston, J.; Cronin, R. R. & Davidson, R. B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Evolution of shiva laser alignment systems

The Shiva oscillator pulse is preamplified and divided into twenty beams. Each beam is then amplified, spatially filtered, directed, and focused onto a target a few hundred micrometers in size producing optical intensities up to 10/sup 16/W/cm/sup 2/. The laser was designed and built with three automatic alignment systems: the oscillator alignment system, which aligns each of the laser's three oscillators to a reference beamline; the chain input pointing system, which points each beam into its … more

Date: July 1, 1980

Creator: Boyd, R.D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Evaluation of solar mirror figure by moire contouring

Moire topography is applied to the figure assessment of solar mirrors. The technique is demonstrated on component facets of a six-meter diameter, four-meter focal length, parabolic dish collector. The relative ease of experimental implementation and subsequent data analysis suggests distinct advantages over the more established laser ray trace or BCS/ICS technique for many applications. The theoretical and experimental considerations necessary to fully implement moire topography on mirror surfa… more

Date: June 1, 1980

Creator: Griffin, J.W. & Lind, M.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Comparison of Predicted Optical Performance With Measured Results for Dish Concentrators

Several optical design tools have been developed at the National Renewable Energy Laboratory (NREL) during the past two years. These have been used extensively both in-house and by industry to analyze dish concentrator systems and to optimize performance of such designs. The first program, OPTDSH, models single-element dish concentrators. The second code, ODMF, allows multifacet dish arrays to be modeled. The accuracy of performance simulations by these programs has been established by comparin… more

Date: April 1, 1991

Creator: Jorgensen, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Shuttering Efficiencies of Nanosecond-Gated Photoemissive Shutter Tubes

Recent studies show that effective shuttering of photoemissive tubes, such as Silicon-Intensified-Target Vidicons (SITVs) and Microchannel-plate Image Intensifier Tubes (MCPTs), can vary widely depending upon the extent of their opacity to an input flux of photons. Optical feedthrough signals from photon transmission through the photocathode to the target or phosphor ranging from 10/sup -4/ to 10/sup -9/ (when compared with gated signals) were measured for a large sampling of commercially avail… more

Date: January 1, 1985

Creator: Yates, George J.; Jaramillo, Steven A.; Pagano, Thomas S. & Black, J.Paul

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Target plane imaging system for the Nova laser

The Nova laser, in operation since December 1984, is capable of irradiating targets with light at 1.05 ..mu..m, 0.53 ..mu..m, and 0.35 ..mu..m. Correct alignment of these harmonic beams uses a system called a target plane imager (TPI). It is a large microscope (four meters long, weighing one thousand kilograms) that relays images from the target chamber center to a video optics module located on the outside of the chamber. Several modes of operation are possible including: near-field viewing an… more

Date: December 12, 1985

Creator: Swift, C. D.; Bliss, E. S.; Jones, W. A.; Reeves, R. J.; Seppala, L. G.; Shelton, R. T. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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High-power pulsed lasers

The ideas that led to the successful construction and operation of large multibeam fusion lasers at the Lawrence Livermore Laboratory are reviewed. These lasers are based on the use of Nd:glass laser materials. However, most of the concepts are applicable to any laser being designed for fusion experimentation. This report is a summary of lectures given by the author at the 20th Scottish University Summer School in Physics, on Laser Plasma Interaction. This report includes basic concepts of the … more

Date: April 2, 1980

Creator: Holzrichter, J.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Thin-thick quadrature frequency conversion

The quadrature conversion scheme is a method of generating the second harmonic. The scheme, which uses two crystals in series, has several advantages over single-crystal or other two crystal schemes. The most important is that it is capable of high conversion efficiency over a large dynamic range of drive intensity and detuning angle.

Date: February 7, 1985

Creator: Eimerl, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Overview of pulsers for nanosecond gating of image-shutter tubes

The capability of generating a useful optical shutter of a few nanoseconds or less utilizing gated proximity-focussed microchannel-plate (MCP) wafer tubes or silicon intensified target (SIT) vidicon tubes depends strongly on the driving electrical pulse. This paper will provide a summary of some of the electrical gate pulsers utilized in studying both proximity-focussed MCP imaging intensifiers and gated SIT FPS vidicon tubes. (WHK)

Date: January 1, 1982

Creator: Yates, G.J.; Ogle, J.W.; King, N.S.P. & Aeby, I.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Multiple-reflection optical gas cell. [DOE Patent Application]

A multiple-reflection optical cell for Raman or fluorescence gas analysis consists of two spherical mirrors positioned transverse to a multiple-pass laser cell in a confronting plane-parallel alignment. The two mirrors are of equal diameter but possess different radii of curvature. The spacing between the mirrors is uniform and less than half of the radius of curvature of either mirror. The mirror of greater curvature possesses a small circular portal in its center which is the effective point … more

Date: June 15, 1981

Creator: Matthews, T.G.

Item Type: Patent

Partner: UNT Libraries Government Documents Department