相干与非相干激光成丝不稳定性的数值模拟研究

NUMERICAL SIMULATION STUDIES ON FILAMENTATION ON COHERENCE AND INCOHERENCE LASER

利用二维三温磁流体力学激光靶程序（ＣＡＳＴＯＲ）数值模拟了相干光和诱导空间非相干（ｉｎｄｕｃｅｄｓｐａｔｉａｌｉｎｃｏｈｅｒｅｎｃｅＩＳＩ）光的成丝不稳定性．用求解激光传播方程和简化流体模型的方法研究了随机相位板（ｒａｎｄｏｍｐｈａｓｅｐｌａｔｅＲＰＰ）光滑化技术对成丝不稳定性的影响，结果表明ＩＳＩ和ＲＰＰ去相干方法可以有条件地减弱或抑制成丝不稳定性．

The filamentation instabilities in coherence and induced spatial incoherence laserbeam have been investigated by computer simulation using a two-dimensional three.temp-erature MHD laser target code.A numerical analysis is employed hased onthe random phase plate smoothing techniques and resolving of laser beam propagationequations for the coupled simplified hydrodynamic model to derive the effects onthe filamentation instability.These results show that the filamentaion instabilitiesmay be suppressed or eliminated under some conditions.