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Proceedings Paper

Pump-induced wavefront distortion in prototypical NIF/LMJ amplifiers: modeling and comparison with experiments
Author(s): Mark D. Rotter; Kenneth S. Jancaitis; Christopher D. Marshall; Luis E. Zapata; A. E. Erlandson; Geoffroy LeTouze; Stephane E. Seznec
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Paper Abstract

In large-aperture laser amplifiers such as those envisioned for the NIF and LMJ lasers, the geometry is such that the front and back faces of the laser slab are heated unevenly by the pump process. This uneven heating result in a mechanical deformation of the laser slab and consequent internal stresses. The deformation and stresses, along with a temperature-dependent refractive index variation, result in phase variations across the laser beam. These phase variations lead to beam steering which may affect frequency conversion as well as energy-on-target. We have developed a model which allows us to estimate the pump-induced wavefront distortion for a given amplifier configuration as well as the spatially-resolved depolarization. The model is compared with experiments taken in our amplifier development laboratory, AMPLAB.

Paper Details

Date Published: 23 July 1999
PDF: 22 pages
Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); doi: 10.1117/12.354178
Show Author Affiliations
Mark D. Rotter, Lawrence Livermore National Lab. (United States)
Kenneth S. Jancaitis, Lawrence Livermore National Lab. (United States)
Christopher D. Marshall, Lawrence Livermore National Lab. (United States)
Luis E. Zapata, Lawrence Livermore National Lab. (United States)
A. E. Erlandson, Lawrence Livermore National Lab. (United States)
Geoffroy LeTouze, Ctr. d'Etudes de Limeil-Valenton/CEA (France)
Stephane E. Seznec, Ctr. d'Etudes de Limeil-Valenton/CEA (France)


Published in SPIE Proceedings Vol. 3492:
Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion
W. Howard Lowdermilk, Editor(s)

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