摘要
星载激光测高系统以独特的应用背景而备受关注,其整体性能对关键件激光器的技术参数提出了高需求。分析了500 km轨道高度星载激光测高模型对激光器的技术指标需求,并在此基础上对LD泵浦全固化激光器进行了优化设计和实验研究,采用了侧向半圆柱面LD阵列与热沉交错分布的泵浦几何,实现了整体上的增益和热传导均匀效果,采用角锥棱镜高斯反射率镜谐振腔选取低横模结构,获得了高机械稳定性,高热稳定性和高光束质量激光输出,设计样机重复频率30 Hz,单脉冲能量66.2 mJ,脉冲宽度6.056 ns,稳定性优于3%,光束发散角0.6 mrad,光轴指向近乎零漂移,满足了星载激光测高应用。
Satellite laser altimeter （SLA）, focus and trend of application in space, calls for the key parameters of the laser transmitter. On the basis of modeling for SLA with 500 km orbit altitude, the optimal design of all-solid-state laser is analyzed and confn-rned by experiment. A novel pump module of semicircular LD array oppositely arranged with heat-sink is well-designed. A resonator consisting of a corner-cube and a Gauss reflectivity mirror is used to obtain high mechanical stability, high thermal stability, and high beam quality. This laser produces the single pulse energy of 66.2 mJ at 30 Hz in 6.056 ns pulse, with energy stability better than 3%, the beam divergence of 0.6 mrad, and optics axes nearly nil drift. The results indicate that the laser is a practical engineering instrument for the SLA.
出处
《红外与激光工程》
EI
CSCD
北大核心
2007年第6期794-797,880,共5页
Infrared and Laser Engineering
基金
国防科技重点预研项目(41321080301)
