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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。
Spaceborne laser altimetry system has attracted a great deal of attention due to its unique application background. Its overall performance poses a high demand for the technical parameters of key laser components. Based on the analysis of the 500-km orbit height spaceborne laser altimetry model laser technology requirements, and based on the optimal design and experimental study of LD-pumped all-solid-state lasers, the use of lateral semi-cylindrical LD array and heat The staggered staggered pumping geometry realizes the overall gain and heat conduction uniform effect. The low transverse mode structure is selected by using the pyramid prism Gaussian reflectivity mirror resonator to obtain high mechanical stability, high thermal stability and high beam quality laser The designed prototype has a repetition rate of 30 Hz, a single pulse energy of 66.2 mJ, a pulse width of 6.056 ns, a stability of better than 3%, a beam divergence of 0.6 mrad and an almost zero drift of the optical axis, satisfying the application of spaceborne laser altimetry.