Amplification of light in a plasma by stimulated ion acoustic waves driven by multiple crossing pump beams

Kirkwood, R. K.; Michel, P.; London, R. A.; Callahan, D.; Meezan, N.; Williams, E.; Seka, W.; Suter, L.; Haynam, C.; Landen, O.

doi:10.1103/PhysRevE.84.026402

Title: Amplification of light in a plasma by stimulated ion acoustic waves driven by multiple crossing pump beams

Journal Article · Thu Aug 04 00:00:00 EDT 2011 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

DOI:https://doi.org/10.1103/PhysRevE.84.026402· OSTI ID:1419004

Kirkwood, R. K. ^[1]; Michel, P. ^[1]; London, R. A. ^[1]; Callahan, D. ^[1]; Meezan, N. ^[1]; Williams, E. ^[1]; Seka, W. ^[2]; Suter, L. ^[1]; Haynam, C. ^[1]; Landen, O. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Experiments demonstrate the amplification of 351 nm laser light in a hot dense plasma similar to those in inertial confinement fusion ignition experiments. A seed beam interacts with one or two counter-propagating pump beams, each with an intensity of 1.2 × 10¹⁵ W/cm² at 351 nm, crossing the seed at 24.8° at the position where the flow is Mach 1, allowing resonant stimulation of ion acoustic waves. Results show that the energy and power transferred to the seed are increased with two pumps beyond the level that occurs with a single pump, demonstrating that, under conditions similar to ignition experiments where each beam has a low gain exponent, the total scatter produced by the multiple beams can be significantly larger than that of the individual beams. It is further demonstrated that the amplification is greatly reduced when the pump polarization is orthogonal to the seed, as expected from models of stimulated scatter.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1419004

Journal Information:: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics, Vol. 84, Issue 2; ISSN 1539-3755

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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