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对激光辐照箔靶产生的等离子体中Ｘ射线激光的传播和放大过程进行了解析的分析。在Ｒ．Ａ．Ｌｏｎｄｏｎ物理模型的基础上，用解析的方法描述了抛物线型电子密度分布增益纵剖面中Ｘ射线激光传播和放大过程的物理实质。指出了用最陡下降法求出的解析解中的误差，并给出了折射长度的临界值。
The analysis of the propagation and amplification of X-ray laser in the plasma generated by the laser irradiation foil target is analyzed. In R. A. Based on the physical model of London, the analytical method is used to describe the physical essence of X-ray laser propagation and amplification in the longitudinal profile of the parabolic electron density distribution gain. The error in the analytic solution obtained by steepest descent method is pointed out and the critical value of refraction length is given.