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

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In large-aperture laser amplifiers such as those envisioned for the National Ignition Facility (NIF) and Laser Megajoules (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 results 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 (so-called pump-induced wavefront distortions). These phase variations lead to beam steering which may affect frequency conversion as well as energy-on-target. We have developed a model ... continued below

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Erlandson, A; Jancaitis, K; LeTouze, G; Marshall, C; Rotter, M; Seznec, S et al. September 1, 1998.

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In large-aperture laser amplifiers such as those envisioned for the National Ignition Facility (NIF) and Laser Megajoules (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 results 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 (so-called pump-induced wavefront distortions). 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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1.6 megabytes

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  • Third Annual International Conference/Solid State Lasers for Application (SSLA) to Inertial Confinement Fusion (ICF), Monterey, CA, June 7-12, 1998

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  • Other: DE00007492
  • Report No.: UCRL-JC-130044
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 7492
  • Archival Resource Key: ark:/67531/metadc703119

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  • September 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 6, 2016, 11:02 p.m.

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Erlandson, A; Jancaitis, K; LeTouze, G; Marshall, C; Rotter, M; Seznec, S et al. Pump-induced wavefront distortion in prototypical NIF/LMJ amplifiers-modeling and comparison with experiments, article, September 1, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc703119/: accessed October 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.