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Proceedings Paper

Amplifier pumping optimization (in French)
Author(s): Geoffroy LeTouze; Olivier Cabourdin; Mireille Guenet; J. F. Mengue; Kenneth S. Jancaitis; Mark D. Rotter
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Paper Abstract

Slabs in NIF/LMJ large-aperture amplifiers are set at Brewster angle between two lamp arrays. A 2D+ ray-trace code is used to predict pump and gain coefficients profiles in the aperture. Code predictions, in good agreement with experimental results, show the high decay rate due to amplification of spontaneous emission leads to a strong depletion of the stored energy on the edges of the slabs. To compensate for this roll-off, shaped reflectors were calculated at CEL-V, using a dedicated routine added to the ray-trace code. They were fabricated and tested on the modified beamlet amplifier at LLNL. Numerical and experimental results agree to show that it is possible to redirect light using shaped reflectors, and that directing the pump radiation towards the edges of the aperture leads to a more uniform gain.

Paper Details

Date Published: 8 December 1997
PDF: 10 pages
Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); doi: 10.1117/12.294346
Show Author Affiliations
Geoffroy LeTouze, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Olivier Cabourdin, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Mireille Guenet, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
J. F. Mengue, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Kenneth S. Jancaitis, Lawrence Livermore National Lab. (United States)
Mark D. Rotter, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3047:
Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference
Michel L. Andre, Editor(s)

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