摘要
设计了一台可输出1064 nm和532 nm激光脉冲的高能高频激光器,分别用于EAST汤姆逊散射诊断系统对芯部区域和边界区域等离子体电子温度和密度的诊断。该激光器采用电光调Q、卡塞格林非稳腔以及氙灯泵浦脉冲放大器实现频率为100 Hz的3.5 J@1064 nm激光输出。通过两级半导体侧泵浦模块对基频光能量放大,输出激光能量5.5 J@1064 nm。通过理论计算和分析,确定泵浦模块的放大能力,并与实验结果进行对照。采用LBO晶体对基频光进行倍频,输出能量为3 J@532 nm的脉冲激光,倍频效率为55%。输出基频光光斑直径约为14.51 mm,脉冲宽度11.90 ns,倍频光光斑直径约为17.81 mm,脉冲宽度9.92 ns,激光脉冲呈超高斯平顶分布。重复频率从1~100 Hz可调,汤姆逊散射诊断的空间分辨率达10 ms,为芯部和边界输运垒等微观物理问题的研究提供了条件。
A high-energy and high-frequency laser with 1064 nm and 532 nm laser pulses is designed to diagnose the plasma electron temperature and density in the core and boundary regions of EAST Thomson scattering diagnostic system,respectively.We use electro-optic Q-switching,Cassegrain unstable cavity and xenon lamp pumped pulse amplifier to output a frequency of 100 Hz and an energy of 3.5 J@1064 nm laser pulse.The fundamental frequency optical energy is amplified by two-stage semiconductor side pump module to output laser energy of 5.5 J@1064 nm.Through theoretical calculation and analysis,the amplification capacity of the pump module is determined and compared with the experimental results.LBO crystal is used to double the fundamental frequency light,and the output energy is 3 J@532 nm pulse laser,the frequency doubling efficiency is 55%.The diameter of the output fundamental frequency light spot is about 14.51 mm,the pulse width is 11.90 ns,the diameter of the frequency doubling light spot is about 17.81 mm,the pulse width is 9.92 ns,and the laser pulse is Gaussian flat top distribution.The repetition rate is adjustable from 1 Hz to 100 Hz,and the spatial resolution of Thomson scattering diagnostic is up to 10 ms,which provides conditions for the study of microphysical problems such as core and boundary transport barrier.
作者
刘玮
臧庆
任梦芳
韩效锋
扈嘉辉
周健
肖树妹
Liu Wei;Zang Qing;Ren Mengfang;Han Xiaofeng;Hu Jiahui;Zhou Jian;Xiao Shumei(Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2022年第10期122-127,共6页
Infrared and Laser Engineering
基金
国家重点研发计划(2017YFE0301104,2017YFE0301105)
国家自然科学基金(12075281)
中国科学院合肥大科学中心卓越用户计划(2021HSC-UE012)。
关键词
固体激光器
汤姆逊散射诊断
ND:YAG
倍频
solid-state laser
Thomson scattering diagnosis
Nd:YAG
frequency doubling
