毛细管放电抽运软X光激光产生条件的实验研究  

Experimental Investigation of Lasing Condition for Soft X-ray Laser Pumped by Capillary Discharge

作　　者：栾伯晗[1] 赵永蓬[1] 吴寅初[1] 程元丽[1] 王骐[1] 

机构地区：[1]哈尔滨工业大学可调谐激光技术国家级重点实验室,黑龙江哈尔滨150001

出　　处：《中国激光》2005年第9期1189-1192,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(60038010);国家863计划(863-804-7-10)资助项目

摘　　要：实验探索了较低氩气气压下激光产生的条件。利用X射线二极管(XRD)测量了毛细管放电激励类氖氩46.9 nm软X光激光的输出。在其他实验参量不变的情况下,改变主脉冲电流的波形,比较了激光尖峰与背景光的相对位置。实验结果表明,当氩气气压为23 Pa时,激光产生时间相对于不同的电流上升沿是一个在小范围内基本稳定的值,约为40 ns左右;激光尖峰产生于背景光的峰值附近,表明激光尖峰是产生在等离子体被压缩到轴心后的停滞阶段。实验结果证实了只有当等离子体的电子温度、电子密度同时在最佳范围时才能产生软X光激光,并且主脉冲电流对等离子体压缩加热到合适产生激光的电子温度需要一个相对固定的时间;这个时间与主脉冲电流前沿的快慢无关。This paper studies the lasing condition at lower pressure of argon with experiment. In the experiment the laser spike of 46.9 nm Ne-like argon pumped by capillary discharge was measured with X-ray diode （XRD）. Changing the wave form of the main current while other experimental parameters being unchanged, the laser spike and the position of background light were contrasted. The results show that the lasing time is approximately 40 ns that is almost a fixed value within a small range when the rise-time of the main current changes. The laser spike appears approaching to the peak of the background light at 23 Pa argon pressure. The laser occurs at stagnation stage of plasma which means that the plasma has been compressed to axis. Therefore, the experimental results verify that soft-X-ray laser only comes into being when electron temperature and electron pressure of plasma reach its optimum range simultaneously, and the time, in which the main current needs to heat the plasma to a suitable temperature for lasing, is a relatively fixed value and does not depend on the rise-time of the main current.

关 键 词：X射线光学 软X光激光 毛细管放电 电流上升沿 激光产生时间 

分 类 号：O434[机械工程—光学工程] TN248[理学—光学]