摘要
由于等离子体柱中有垂直于轴向的电子密度梯度,致使X光激光在等离子体柱内传播时发生折射。折射效应限制了增益区的长度,采用“双靶对接”的实验方法,能有效地抑制折射的影响。本文从理论上阐述了折射效应对激光增益的影响相当于在小讯号增益系数上加了一个负项;并给出X光激光出靶端的强度角分布及偏离轴向的折射角;为“双靶对接”实验提供靶面的夹角值。理论计算结果与实验结果符合得很好。
Because of electron density gradients, refraction will occur when x rays propagate in plasmas. Refraction tends to go direct the x rays out of high density regions ,shortening the distance that x rays can travel within the plasmas, and limiting the amplification thereby . In thick target , refraction is more serious. Double- targets coupling design can lessen refraction .In this paper , we suppose that the density and gain profiles within the plasma are linear and find that refraction introduces a loss term to the laser amplification .Theoretical simulations for x -rays refraction in the gain region are shown .
出处
《强激光与粒子束》
EI
CAS
CSCD
1992年第2期181-185,共5页
High Power Laser and Particle Beams
基金
国家高技术计划激光领域资助项目
关键词
等离子体
传播
折射效应
X光激光
electron density gradients , refraction effect, saturation of gain length , double targets coupling , x -ray laser.
