Amplifier pumping optimization (in French)

Geoffroy LeTouze; Olivier Cabourdin; Mireille Guenet; J. F. Mengue; Kenneth S. Jancaitis; Mark D. Rotter

doi:10.1117/12.294346

8 December 1997 Amplifier pumping optimization (in French)

Geoffroy LeTouze, Olivier Cabourdin, Mireille Guenet, J. F. Mengue, Kenneth S. Jancaitis, Mark D. Rotter

Proceedings Volume 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference; (1997) https://doi.org/10.1117/12.294346
Event: Second International Conference on Solid State Lasers for Application to ICF, 1996, Paris, France

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.

Citation Download Citation

Geoffroy LeTouze, Olivier Cabourdin, Mireille Guenet, J. F. Mengue, Kenneth S. Jancaitis, and Mark D. Rotter "Amplifier pumping optimization (in French)", Proc. SPIE 3047, Solid State Lasers for Application to Inertial Confinement Fusion: Second Annual International Conference, (8 December 1997); https://doi.org/10.1117/12.294346

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KEYWORDS

Lamps

Amplifiers

Lanthanum

Plasma

Atomic force microscopy

Reflectors

Silicon

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