Thresholds of absolute instabilities driven by a broadband laser

Follett, R. K.; Shaw, J. G.; Myatt, J. F.; Dorrer, C.; Froula, D. H.; Palastro, J. P.

doi:10.1063/1.5098479

Title: Thresholds of absolute instabilities driven by a broadband laser

Journal Article · 11 June 2019 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5098479 · OSTI ID:1530731

Follett, R. K. ^[1];

^[2]; Myatt, J. F. ^[3]; Dorrer, C. ^[2];

^[2];

^[2]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Univ. of Alberta, Edmonton, AB (Canada)

Absolute instability thresholds for stimulated Raman scattering and two-plasmon decay driven by a broadband laser pulse are evaluated numerically. The scalings of the calculated thresholds with density scale length, temperature, and central wavelength are qualitatively similar to existing analytic results. The threshold values, yet, reflect significant quantitative differences. Comparisons between thresholds calculated for various broadband power spectra suggest a universal scaling of the threshold intensity with laser coherence time ($$\tau_{c}$$). For SRS I_thr ∝ $$\tau_{c}^{-1/3}$$, and for TPD I_thr ∝ $$\tau_{c}^{-1/2}$$ .

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

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

Grant/Contract Number:: NA0003856

OSTI ID:: 1530731

Report Number(s):: 2019-82, 1505; 2019-82, 1505, 2465

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 26; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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