摘要
在1.2×1013W·cm-2低功率密度下,对基频激光预主短脉冲驱动类镍银X光激光机理进行了数值模拟和理论分析。证实了在靶长23mm范围内X光激光都能获得有效放大,取得了和实验相符合的结果。考虑了单柱面镜线聚焦沿靶长度方向功率密度的非均匀性对X光激光放大的影响,采用弯曲靶能有效克服折射以及单柱面镜线聚焦功率密度非均匀带来的不利影响。理论模拟给出的类镍银X光激光的出光下限泵浦功率密度也与实验符合得很好。理论模拟还表明,采用1%左右的预脉冲强度并对预主脉冲时间间隔进行优化,X光激光的输出能量和能量转换效率将获得大幅度提高。
The simulation and theoretical analysis of Ni-like Ag X-ray-laser (XRL) are included, which are driven by 1.06 nm pre-main-pulse with a power of 1.2×1013 W/cm2. It is verified that, employing 23 mm target, XRL can obtain effective amplification, which agrees with experiments. Power nonuniformity along focus line, induced by single cylindrical lens, is also considered. According to theoretical simulation, adopting curve target can effectively overcome the effect of reflection and the disadvantage of this nonuniformity. Lower limit of drive power needed by output of Ni-like Ag XRL, predicted by theoretical simulation, also agrees with experiments. Theoretical simulation shows that, using 1% pre-pulse, if appropriate optimization of time interval between pre-and main pulse has been conducted, the output energy of XRL as well as conversion efficiency of energy can be dramatically enhanced.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2004年第11期1375-1379,共5页
High Power Laser and Particle Beams
基金
国家自然科学基金重点项目资助课题(69989801)
国家863计划项目资助课题
关键词
类镍银
X光激光
饱和增益
数值模拟
Computer simulation
Energy conversion
Gain measurement
Plasmas
