摘要
建立了一套以主动-主动瞬态锁模激光器为主振荡器,一级双程预放大和两级单程放大组成的高重复频率大能量锁模激光系统,并采用了精密腔长调节、单脉冲选择、热退偏补偿及抗高功率密度光损伤等关键技术。在频率20 Hz时,1064 nm单脉冲激光输出能量≥500 mJ,脉冲宽度为300 ps,发散角≤0.8 mrad,外触发与出光时间抖动为±15 ns。用BBO晶体倍频,532 nm激光输出能量≥240 mJ,转换效率≥45%。该激光器已用于远程人造卫星测距,工作脉冲次数≥2×108,测距精度2 cm左右。
The high power mode-locking laser system consists of an active-active mode-locking oscillator, a doublepass pre-amplifier, and two single-pass amplifiers. And the fine cavity length adjustment mechanics, single pulse selector, compensation for depolarization, and other key technologies are used. 1064-nm single pulse energy over 500 mJ is obtained, whose pulse duration is 300 ps, and the jitter is ± 15 ns with respect to the external trigger. In addition, 532-nm single pulse energy exceeds 240 mJ, whose harmonic generation efficiency is more than 45 % by using BBO crystal. And this laser has been used in satellite laser ranging （SLR） system, with pulse shots larger than 2×10^8 .
出处
《中国激光》
EI
CAS
CSCD
北大核心
2009年第7期1822-1825,共4页
Chinese Journal of Lasers
关键词
激光器
高峰值功率
主动-主动瞬态锁模
精密腔长调节技术
单脉冲选择
BBO倍频
lasers
high peak power
active-active transient mode-locking
precition cavity length adjust
single pulse select technology
BBO harmonic generation
