Pump-induced wavefront distortion in prototypical NIF/LMJ amplifiers: modeling and comparison with experiments

Mark D. Rotter; Kenneth S. Jancaitis; Christopher D. Marshall; Luis E. Zapata; A. E. Erlandson; Geoffroy LeTouze; Stephane E. Seznec

doi:10.1117/12.354178

23 July 1999 Pump-induced wavefront distortion in prototypical NIF/LMJ amplifiers: modeling and comparison with experiments

Mark D. Rotter, Kenneth S. Jancaitis, Christopher D. Marshall, Luis E. Zapata, A. E. Erlandson, Geoffroy LeTouze, Stephane E. Seznec

Author Affiliations +

Proceedings Volume 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion; (1999) https://doi.org/10.1117/12.354178
Event: Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, 1998, Monterey, CA, United States

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.

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Mark D. Rotter, Kenneth S. Jancaitis, Christopher D. Marshall, Luis E. Zapata, A. E. Erlandson, Geoffroy LeTouze, and Stephane E. Seznec "Pump-induced wavefront distortion in prototypical NIF/LMJ amplifiers: modeling and comparison with experiments", Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); https://doi.org/10.1117/12.354178

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