在长标度长度激光等离子体中使用空间、时间和偏振光束平滑相结合的方式减少背向散射

Backscatter reduction using combined spatial, temporal, and polarization beam smoothing in a long-scale-length laser plasma.

作者信息

Moody J D, MacGowan B J, Rothenberg J E, Berger R L, Divol L, Glenzer S H, Kirkwood R K, Williams E A, Young P E

机构信息

Lawrence Livermore National Laboratory, University of California, Livermore, CA 94551, USA.

出版信息

Phys Rev Lett. 2001 Mar 26;86(13):2810-3. doi: 10.1103/PhysRevLett.86.2810.

DOI:10.1103/PhysRevLett.86.2810

PMID:11290045

Abstract

Spatial, temporal, and polarization smoothing schemes are combined for the first time to reduce to a few percent the total stimulated backscatter of a NIF-like probe laser beam (2x10(15) W/cm (2), 351 nm, f/8) in a long-scale-length laser plasma. Combining temporal and polarization smoothing reduces simulated Brillouin scattering and simulated Raman scattering (SRS) up to an order of magnitude although neither smoothing scheme by itself is uniformly effective. The results agree with trends observed in simulations performed with the laser-plasma interaction code F3D simulations [R. L. Berger et al., Phys. Plasma 6, 1043 (1999)].

摘要

首次将空间、时间和偏振平滑方案相结合，以将长标度长度激光等离子体中类国家点火装置（NIF）探测激光束（2×10¹⁵ W/cm²，351 nm，f/8）的总受激背向散射降低到百分之几。结合时间和偏振平滑可将模拟的布里渊散射和模拟的拉曼散射（SRS）降低一个数量级，尽管单独的任何一种平滑方案都不是始终有效。这些结果与使用激光 - 等离子体相互作用代码F3D模拟[R. L. 伯杰等人，《物理等离子体》6, 1043 (1999)]所观察到的趋势一致。