预-主短脉冲激光驱动的高增益类氖氩软X射线激光  

High gain neon-like Ar soft X-ray laser driven by short prepulse and mainpulse laser

作　　者：彭惠民[1] 郑无敌[1] 张覃鑫[1] 陆培祥[2] 张国平[1] 

机构地区：[1]北京应用物理与计算数学研究所,北京100088 [2]中国科学院上海光学精密机械研究所,上海201800

出　　处：《强激光与粒子束》2004年第9期1139-1142,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金资助课题(60038010);国家863计划项目资助课题。

摘　　要：　用数值模拟程序计算了脉宽1.5ps预脉冲和主脉冲激光,经1.2ns的时间延迟先后泵浦喷射的密度为6.632×10-3g/cm3的氩气柱,以获得高增益的类氖离子电子碰撞激发3p 3s跃迁激光的可能性。结果表明:在等离子体中能够形成宽的类氖离子丰度大于50%的区域,并且具有大于1020cm-3的自由电子密度。主脉冲到达之后迅速加热自由电子,高密度的自由电子与类氖离子碰撞激发形成具有很高增益系数的增益区,增益区的半高宽度大约100μm,一维理论计算的增益系数为200～300cm-1,持续时间大约相当于泵浦激光的时间宽度,在1～2ps之间。In order to study the probability of high gain soft X-ray laser in 3p-3s transition of electron collisional excitation in neon-like ions of argon, a simulation of gas puff column with initial density 6.632 × 10-3 g/cm3 irradiating by 1.5 ps double pulses with a 1.2 ns separation is presented. The results show that a wide region in which the abundance of the neon-like ion is more than 50% and the free electron density is more than 1020 cm-3 is obtained. The short main pulse rapidly heats electrons to a temperature of higher than 1 keV, and a high gain region is produced by collision of high density free electrons with Ne-like argon ions. The gain region occurs about at a time scale of duration of pumping laser pulse, and its width is more than 100 /^m. The gain coefficient is 200 - 300 cm-1.

关 键 词：预主脉冲 类氖氩离子 X射线激光 

分 类 号：O432.1[机械工程—光学工程] TN241[理学—光学]