Mitigation of self-focusing in Thomson scattering experiments

Hansen, A. M.; Turnbull, D.; Katz, J.; Froula, D. H.

doi:10.1063/1.5125249

Title: Mitigation of self-focusing in Thomson scattering experiments

Journal Article · 23 October 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5125249 · OSTI ID:1572077

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Univ. of Rochester, NY (United States)

A fundamental challenge associated with measuring Thomson scattering comes from the small scattering cross section associated with the interaction. Here, to improve photon statistics a powerful Thomson-scattering probe laser is required. Ponderomotive self-focusing limits the maximum power in the Thomson-scattering probe and was shown to limit the maximum achievable Thomson-scattering signal-to-noise ratio. Operating the laser at powers above the self-focusing critical power was shown to cause beam degradation, which reduced the amount of collected Thomson-scattered light. Using a phase plate was shown to improve laser beam propagation, and consequently improve the signal-to-noise ratio in the measured spectrum.

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: Laboratory for Laser Energetics, University of Rochester

Grant/Contract Number:: NA0003856

OSTI ID:: 1572077

Report Number(s):: 2019-119, 2485, 1525; 2019-119, 2485, 1525; TRN: US2100292

Journal Information:: Physics of Plasmas, Vol. 26, Issue 10; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 10 works

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