Thermal effect analysis of all-solid-state solar pumped laser
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摘要: 太阳光泵浦激光器是将太阳光直接转化为激光的装置，具有能量转换环节少、效率高、结构简单可靠、性能稳定以及无污染等优点。对应用于空间环境（4 K）的全固态太阳光泵浦激光器进行了建模，并对泵浦太阳光收集阶段进行了热效应分析。先后考虑两种安装底座和四种太阳光线偏转情况，运用ANSYS Workbench@热分析软件分别进行了稳态热分析。针对第一种情况得到的可行性验证，提出了下一步的改进优化意见，并初步设想进行实际模型搭建和测试。针对第二种不可行情况，提出了几种可能的改进措施，并对未来的工作进行了展望。该研究为太阳光泵浦激光器在空间环境中的实际应用提供了一种全新的、采用全固态传导冷却方式温控系统的可行方案，为未来空间太阳光泵浦激光器能够得到实际应用提供了研究资料。Abstract: The solar-pumped laser is a device that directly converts the sunlight into the laser. It has the advantages of less energy conversion, high efficiency, simple and reliable structure, stable performance and no pollution. An all-solid-state solar-pumped laser for the space environment (4 K) was modeled, and the thermal effect of the pumped solar collection phase was analyzed. The steady-state thermal analysis was carried out by using ANSYS Workbench@ thermal analysis software, considering two mounting bases and four solar deflection conditions. According to the feasibility verification of the first case, the suggestions for further improvement and optimization were put forward, and the actual model building and testing were preliminarily envisaged. In view of the second infeasible case, several possible improvement measures were put forward, and the future work was prospected. This study provides a new feasible scheme of temperature control system with all-solid-state conduction cooling for the practical application of solar pumped laser in space environment, and provides research data for the practical application of space solar pumped laser in the future.
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图 1 全固态太阳光泵浦激光器简化热分析模型
Fig. 1 Simplified thermal analysis model of all-solid-state solar pumped laser
图 4 锥形腔前表面辐照度分布图
Fig. 4 Irradiance distribution diagram of front surface of conical cavity
图 5 稳态热分析结果图（等值线图）
Fig. 5 Diagram of steady-state thermal analysis results (contour map)
图 6 晶体棒及锥形腔部分的热量分布曲线图
Fig. 6 Heat distribution curves of crystal rod and conical cavity
表 1 激光器简化模型各部分材质及对应热导率
Table 1 Materials and corresponding thermal conductivity of each part of simplified laser model
结构 材质 各向同性热导率/
（W/（m·K））晶体棒 Nd:YAG 14（20 ℃）；
10.5（100 ℃）锥形腔 YAG 14（20 ℃）；
10.5（100 ℃）铜基座和模型后底座 铜 397 菲涅尔透镜 聚甲基丙烯酸甲酯
（PMMA）0.19 外壳 铝合金 151 
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表 2 太阳光光线追迹辐照度分布
Table 2 Solar ray tracing irradiance distribution
光源绕
X轴旋转上面 下面 侧左面 侧右面 后面 1面 2面 0° 1.2 1.1 1.1 1.3 6.8 5.4 130.9 1° 5.4 1.2 1.2 1.4 15.9 19.7 123.0 2° 5.7 6.7 1.2 1.4 33.8 52.7 80.2 3° 6.0 1.6 1.2 1.4 51.2 105.3 4.5 4° 6.1 1.6 1.2 1.4 73.8 70.0 1.5 5° 5.7 1.9 1.2 1.4 122.4 5.6 0.4 10° 5.4 10.0 1.2 1.5 134.4 0.2 0.1 15° 6.1 25.5 1.4 1.5 113.9 0.1 0 20° 6.1 51.3 1.9 2.4 77.0 0.1 0 25° 9.1 121.2 4.1 4.6 12.3 0.1 0 30° 10.6 112.6 6.4 6.3 8.2 0.1 0 35° 10.8 103.4 7.5 6.8 7.6 0.1 0 40° 10.4 95.3 7.6 7.1 3.9 0.1 0 50° 8.7 66.7 7.8 7.2 1.9 0 0 60° 6.0 42.6 6.3 5.4 0.7 0 0 70° 4.1 22.1 3.3 3.7 0.3 0 0 80° 1.0 7.8 0.8 1.4 0.1 0 0 90° 0 0 0 0 0 0 0
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表 3 结果汇总
Table 3 Summary of results
光线偏
转角度简化后
受热情况最高温度（位置） 结论 0° 晶体棒及其锥形腔受热 440.66 K（晶体棒） 可行 3° 模型底座内表面及
铜基座前表面受热389.46 K（晶体棒） 可行 10° 菲涅尔透镜及模型
底座内表面受热353.88 K（菲涅尔透镜） 可行 25° 菲涅尔透镜及铝壳
下内表面受热435.97 K（铝壳） 可行
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表 4 结果汇总
Table 4 Summary of results
光线偏转角度 简化后受热情况 结论 0° 菲涅尔透镜、晶体棒及其锥形腔受热 不可行 3° 菲涅尔透镜、模型底座内表面及铜基
座前表面受热不可行 10° 菲涅尔透镜及模型底座内表面受热 不可行 25° 菲涅尔透镜及铝壳下内表面受热 不可行
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