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Abstracts of the Third International Conference on the Solid State Lasers for Application to Inertial Confinement Fusion

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Abstracts of the Third International Conference on the Solid State Lasers for Application to Inertial Confinement Fusion CONF-980653--Absts. Abstracts of the Third International Conference on the Solid State Lasers for Application to Inertial Confinement Fusion Sponsors: Lawrence Livermore National Laboratory Commissariat 2 1’Energie Atomique June 7-12,1998 l Monterey, California DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United StatesGovernment or the University ofcalifornia. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. This report has been reproduced directly from the best available copy. Available to DOE and DOE contractors from the Office of Scientific and Technical Information P.O. Box 62, Oak Ridge, TN 37831 Prices available from (615) 576-8401, FJS 626&101 Available to the public from the National Technical Information Service US. Department of Commerce 5285 Port Royal Rd., Springtield, VA 22161 Work performed under the auspices of the US. Department of Energy by Lawrence Livermore National Laboratory under Contract W-740.5Eng-48. CONF-98065%-Absts. Abstracts of the Third International Conference on the Solid State Lasers for Application to Inertial Confinement Fusion W. H. Lowdermilk (Technical Coordinator) Sponsors: Lawrence Livermore National Laboratory Commissariat 211 ’Energie Atomique June 7-12,1998 l Monterey, California 005 WI B-4 Color separation grating designs for the National Ignition Facility S. N. Dixit and J. Sanchez Lawrence Livermore National Laboratory L-493, I?. 0. Box 5508, Livermore, California 94553 Tel: (925) 423-7321 FAX: (925) 422-5537 E-mail: [email protected] Current NIF baseline employs a color separation grating (CSG) for diverting the unconverted light away from the ICF target. The NIF CSG consists of a three level lamellar grating structure which diverts nearly all of the unconverted lw and 2w light while leaving the 3w light undiffracted. Nearly 84% of the diffracted light is contained in two orders (-1 and +2 for example) with the remaining energy distributed in several higher orders. The direction of the diffraction can be rotated by changing the orientation on the CSG on the optic. From fabrication considerations, it is preferable to have a minimal number of different CSG orientations. At the same time, it is important to ensure that the diffracted light is not hitting the target insertion module and the various diagnostic ports near the target chamber center and is prevented from entering other laser ports. For some users on NIF it is also desirable to provide a fairly large (several cm long) gap near the hohlraum. We have developed a computer model to analyze and display the location of the various diffracted orders in the NIF target chamber. The code generates the intensity distribution in a user prescribed volume from all the 192 NIF beams. Arbitrary CSG periods and grating orientations can be selected externally. Using this computer code, we are developing CSG layouts for all the 192 NIF beams which satisfy the constraints regarding the distribution of the unconverted light near the target chamber center. Preliminary designs indicate that only a few CSG orientations may be sufficient to satisfy all the requirements. Detailed results will be presented. This work was performed under the auspices of the U. S. Department of Energy by the Lawrence Livermore National Laboratory under Contract No. W-7405-Erg-48. 005-A ‘.. ‘, TH38-4 1. Fabrication of large aperture color separation grating for Beamlet laser S. N. Dixit, L. Auyang, J. Britten, T. Parham, M. Rushford and L. Summers Lawrence Livermore National Laboratory L-493, P. 0. Box 5508, Livermore, California 94551 Tel: (925) 423-7321 FAX: (925) 422-5537 E-mail: [email protected] Current National Ignition Facility (NIF) baseline design employs a color separation grating (CSG) for diverting the unconverted light away from the ICF target. CSG consists of a three level lamellar grating structure designed so that nearly all of the 30 light passes through undiffracted while the unconverted 10 and 20 light is diffracted away from the target. Considerations such as the mask and overlay precision, etch depth control etc. place limitations on the actual performance of a CSG. We have recently fabricated a full aperture (40-cm square) color separation grating in fused silica for use on the Beamlet laser. This CSG had a period of 345 pm and was fabricated using a two mask lithography process with wet etching. Off-line measurements of the lo and 20 transmission indicate that less than 1% of the light at these wavelengths is remaining in the zeroth order. The 30 transmission in the zeroth order for an non-anti- reflection coated substrate is 89% which compares well with the transmission of an uncoated fused silica flat (92.5%). We are currently examining the anti- reflection coated CSG performance. Results will be reported along with its performance on the Beamlet laser. This work was performed under the auspices of the U. S. Department of Energy by the Lawrence Livermore National Laboratory under Contract No. W-7405Eng-48. EXPERIMENTAL AND CALCULATIONAL INVESTIGATION OF THE OUTPUT PULSE TEMPORAL PROFILING METHOD CONSISTING IN TEMPORAL SHIFTS OF PULSES FROM VARIOUS PARTS OF APERTURE Eroshenko Victor A., Annenkov Vladimir I., Solomatin Igor I., Chebotar Victor S. Russian Federal Nuclear Center - Institute of Experimental Physics (VNIIEF) 37, pr.Mira, Sarov, Nizhni Novgorod region, Russia, 607190 Phone: (831-30)-4-56-46, Fax: (831-30)-5-45-65, E-mail: [email protected] Experimentally and calculationaly the possibilities and problems are analysed of the high-power laser output pulse temporal profiling method which consists in relative temporal shifts of separate parts of beam aperture. Beam splitting is made at the early stages of pulse amplification. The effects of subsequent amplification and spatial filtration are investigated. COMPUTER MODELING OF OUTPUT AMPLIFIER MODULE PUMPING OF “LUCH” FACILITY AND SHORT PULSE AMPLIFICATION Eroshenko Victor.A., Garanin Sergey.G., Kirillov Gennada.A., Kochemasov Ggennady.G., Krotov Valery.A., Sukharev Stanis1av.A. Russian Federal Nuclear Center - Institute of Experimental Physics (VNIIEF) 37, pr. Mira, Sarov, Nizhni Novgorod region, Russia, 607190 Phone: (831-30) 4-56-46, Fax: (831-30) 5-45-65, E-mail: [email protected] Results of computer modeling by Monte-Carlo method of “Luch” facility amplifier module pumping are reported, as well as results of short pulse amplification calculations in the four-pass output amplifier cascade of this facility. The aim of amplification calculation was amplifier configuration optimization and investigation of the degree of nonlinear pulse distortions during amplification. THE MfiGAJOULES FRONT-END LASER SYSTEM OVERVIEW Philippe Estraillier, Helene Ferrand, Alain Jolly, Philippe Kramer, Jacques Lute, Claude Rouyer Commissariat a l’Energie Atomique BP 02 33114 LE BARB FRANCE The Megajoules laser (LMJ) consists of a 240 beam high-energy glass laser system and target chamber. Each beam originates from the Front-End as a nominal 1 joule, 20 ns pulse, at 1053 nm. Advances in microchip lasers, temporal modulation, diode-pumped rod amplifiers and spatial beam shaping are required to generate the laser pulse for LMJ. Those technologies will be qualified and improved on a full scale 8 beam laser, Ligne d’Int6gration Laser (LIL), whole assembling will start in June 98. In this paper, we present an overview of the Front-End laser system from the master oscillator to the injection into the transport spatial filter of the main laser amplifier. Each beam originates in one of the 240 diode-pumped microchip lasers. The active medium is Nd:YLF crystal, and the output pulse is delivered in a single mode fiber. Spectral and temporal intensity modulations are performed by integrated electro-optic modulators. A phase modulator produces a 0.1 nm chirp and an amplitude modulator controls the beam intensity. The main amplification stages of the Front-End are in the preamplifier module (MPA) which is physically located under the transport spatial filter of the main LMJ beamline. A single mode fiber for each beam provides a 1 nanojoule temporally shaped pulse to each MPA, where the energy is boosted to 10 millijoules at 1 Hz in a diode-pumped regenerative amplifier, and to 1 joule in a four-pass amplifier. The regenerative amplifier is designed with an internal beam shaping, and a side-pumped square rod, in order to provide a flat top square output pulse. Then, the pulse is spatially shaped (to compensate for spatial gain variations in the main laser cavity) by using a spatial light modulator based upon the combination of an electrically addressable liquid crystal display projected onto an optically addressable liquid crystal cell. Finally, a four pass flashlamp-pumped rod amplifier boosts the square beam to approximately 1 joule (diode-pumping is also investigated as an alternative). We will describe the Front-End laser system, and discuss experimental results to date on its components. HIGH THRESHOLD HfO@iO, MIRRORS MADE BY SPUTTERING PROCESS A. Fornier, D. Bernardino, 0. Lam, J. Neauport CEA - Centre d/Etudes de Limeil-Valenton 94195 Villeneuve Saint-Georges Cedex - FRANCE - Tel: 33 145 95 63 92 - Fax: 33 143 86 74 07 F. Dufour, B. Schmitt SAGEM SA Centre d’etude d’Argenteui1 72-74 rue de la Tour Billy 95101 Argenteuil Cedex - FRANCE - Tel: 33 134 26 38 00 - Fax: 33 134 26 37 12 J.M.
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