Random density inhomogeneities and focusability of the output pulses for plasma-based powerful backward Raman amplifiers
Random density inhomogeneities and focusability of the output pulses for plasma-based powerful backward Raman amplifiers
复制标题
基于等离子体的强大后向拉曼放大器的输出脉冲的随机密度不均匀性和可聚焦性
DOI：
10.1063/1.1576761
复制
发表时间：
2003
影响因子：
2.2
通讯作者：
N. Fisch
中科院分区：
文献类型：
--
作者：
A. Solodov;V. Malkin;N. Fisch
等离子体密度的随机不均匀性会使大功率后向拉曼放大器（BRA）的输出脉冲散焦。由于即使是非聚焦的BRA输出也会有高强度的失真，如果发生这种失真，则难以校正。一个简单的表达式推导出的最大BRA长度的输出脉冲可聚焦性尚未损坏。有趣的是，这种限制并不依赖于泵浦激光强度。一个有用的等离子体的不均匀性，可能有助于抑制过早的泵背散射的热噪声的影响也指出。
Random plasma density inhomogeneities may defocus the output pulses of powerful backward Raman amplifiers (BRA). Because of ultrahigh intensities of even nonfocused BRA outputs, such distortions, if occur, are then difficult to correct. A simple expression is derived for the largest BRA length for which the output pulse focusability is not yet spoiled. Interestingly, this limitation does not depend on the pump laser intensity. A useful effect of plasma inhomogeneities that might help to suppress premature pump backscattering by thermal noise is also pointed out.