光学学报, 2001, 21 (6): 706, 网络出版: 2006-08-10
碳、氮原子内壳层光电离X射线激光的理论探讨
Theoretical Investigation of ISPI X-Ray Lasers in C and N
摘要
提出了分析碳、氮原子内壳层光电离X射线激光的解析模型,对C原子K壳层光电离X射线激光的增益进行了理论计算。采用随时间线性增加的X射线抽运速率推导出了激光增益系数随抽运速率的上升速率、原子浓度以及时间变化的解析表达式,给出了峰值时间和峰值增益。在理论上定量地分析了产生X射线激光所需的激光条件和最佳参数的选取,数值模拟与理论计算的结果是一致的。另外,对N原子K壳层光电离X射线激光作了类似的分析。
Abstract
A model employing five energy levels and a fit time-varying linear increase of photon pumping rate of X-ray source is proposed to analyze the gain of inner-shell photoionization (ISPI) X-ray laser in C. The deduced analytical expressions for the time of the onset of the peak gain and its peak value reveal the effects of Auger decay, electron impact ionization, the density of lasing medium and the increase rate of pumping rate on the duration and peak value of the laser gain. The requirement on the intensity of the driving ultra short pulse (USP) laser is estimated and the effect of changing the USP laser pulse duration on the peak gain is also given in this paper. Moreover, the model is used to estimate the requirements on the driving USP laser for ISPI X-ray laser in N.
刘建胜, 刘建胜, 李儒新, 徐至展, 刘晶儒. 碳、氮原子内壳层光电离X射线激光的理论探讨[J]. 光学学报, 2001, 21(6): 706. 刘建胜, 刘建胜, 李儒新, 徐至展, 刘晶儒. Theoretical Investigation of ISPI X-Ray Lasers in C and N[J]. Acta Optica Sinica, 2001, 21(6): 706.