摘要
为了研究低温条件下Yb:YAG放大器的增益和热特性,搭建了一套液氮冷却的低温放大器,开展了实验研究。测量了不同泵浦强度下的小信号增益以及低温和常温下的介质热致波前畸变。结果表明:低温条件下,可以用更少的泵浦能量得到高于常温的增益;常温下泵浦电流200A、脉冲宽度1200μs的小信号增益为1.59;低温下泵浦电流200A、脉冲宽度400μs的小信号增益为1.82,光光效率显著提高。自发辐射放大(ASE)问题在低温下更加显著,采用短脉冲泵浦有利于降低ASE的影响。低温的热管理效果较常温有显著提高,可以在更高的平均功率下运行。
In order to study the gain and thermal aberration properties of cryogenic Yb∶ YAG amplifier,a liquid nitrogen cooled Yb∶YAG laser amplifier was built.Small signal gain for different pumping intensity and thermal aberration at room temperature and cryogenic temperature were measured.The results show that,with less pumping energy higher gain could be obtained at cryogenic temperature than at room temperature.At room temperature with pumping current 200 A and pumping duration 1200 μs,the small signal gain is 1.59; at cryogenic temperature with pumping current 200 A and pumping duration 400 μs,the small signal gain is 1.82.The optical to optical efficiency has increased observably.The effect of amplified spontaneous emission （ASE） is more evident at cryogenic temperature.Using short duration pumping can reduce the effect of ASE.The effect of thermal management was increased significantly at cryogenic temperature,and the laser amplifier can run at a higher average power.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2014年第11期33-36,共4页
High Power Laser and Particle Beams
基金
中国工程物理研究院发展基金项目(2011A0401018)
关键词
激光放大器
小信号增益
低温激光器
热畸变
laser amplifier
small signal gain
cryogenic laser
thermal aberration
