Stimulated Raman backscattering of laser radiation in deep plasma channels
Stimulated Raman backscattering of laser radiation in deep plasma channels
复制标题
深等离子体通道中激光辐射的受激拉曼背向散射
DOI：
10.1063/1.1778743
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
G. Shvets
中科院分区：
文献类型：
--
作者：
S. Kalmykov;G. Shvets
受激拉曼后向散射（RBS）的特点是共振驱动的电子等离子体波（EPW）具有很强的横向局域性。EPW的定位降低了RBS的峰值增长率，增加了放大带宽。背散射辐射的非束缚模式的连续体缩小了通道内的横向场廓线，提高了RBS的增长率。初值问题的解表明，在单模深等离子体通道中，经过RBS放大的电磁脉冲比均匀等离子体拉曼放大时具有更高的群速度。讨论了对等离子体通道中RBS脉冲压缩器设计的启示。
Stimulated Raman backscattering (RBS) of intense laser radiation confined by a single-mode plasma channel with a radial variation of plasma frequency greater than a homogeneous-plasma RBS bandwidth is characterized by a strong transverse localization of resonantly driven electron plasma waves (EPW). The EPW localization reduces the peak growth rate of RBS and increases the amplification bandwidth. The continuum of nonbound modes of backscattered radiation shrinks the transverse field profile in a channel and increases the RBS growth rate. Solution of the initial-value problem shows that an electromagnetic pulse amplified by the RBS in the single-mode deep plasma channel has a group velocity higher than in the case of homogeneous-plasma Raman amplification. Implications to the design of a RBS pulse compressor in a plasma channel are discussed.