摘要
为改善TEA CO2同轴非稳腔激光器输出光束质量,采用涡流管低温气流冷却窗口及凸镜,实验实时测量了单脉冲平均能量18.3 J、在不同工作频率下及是否采用涡流管冷却情况下的光束模式,并计算出衍射极限倍数因子值。激光器工作频率3 Hz,连续运行300 s,没有涡流管冷却时衍射极限倍数因子值由3.52变化到6.94;采用涡流管冷却后,该值仅由3.50变化到3.88。
The beam quality of unstable resonator of TEA CO2 coaxial output laser is deteriorated remarkably by the thermal accumulation of the output coupler. In order to improve the beam quality, a vortex tube cooling system of output coupler was adopted. The divergence angle was measured at an average pulse energy of 18.3 J under condition of different frequency with and without using the vortex tube cooling system at real time, and the times-diffraction-limited factor was studied. The results show that the times-diffraction-limited factor was changed from 3.52 to 6.94 without the vortex tube cooling system and from 3.50 to 3.88 with the cooling system at 3 Hz during an operating time of 300 s.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2007年第7期1057-1060,共4页
High Power Laser and Particle Beams
基金
国家973项目资助课题(51328)
国家863计划项目资助课题
