宽温度范围无制冷固体激光器

设计完成了一种适用于宽温度范围内的无制冷被动调Q固体激光器。根据激光二极管(LD)输出波长随温度漂移的特性，对不同波长叠加组合，实现了20 ℃范围内808 nm泵浦光的稳定输出。优化了泵浦源结构并通过Ansys软件进行稳态热模拟仿真，结果表明其可以实现自然冷却。依据泵浦能量及材料参数，确定了最优的输出镜反射率和饱和吸收体初始透过率分别为28%和34%，被动调Q后的单脉冲输出能量模拟值为9.8 mJ，脉宽为9 ns。通过实验，在35~55 ℃温度范围内，自然冷却条件下获得了单脉冲能量8.6 mJ、脉冲宽度10.2 ns的1064 nm激光输出，单阵列功率不稳定性低于5%，阵列切换时功率不稳定性低于12%。

Wide-temperature-range and uncooled solid-state-laser

An uncooled, passively-Q-switched laser with wide-temperature-range is reported. According to the dependences that the wavelength of laser diode drifts with temperature, a superimposed combination of different wavelength points was made. The thermal property was simulated by Ansys and it turns out that the optimized pump structure can meet the requirements of natural cooling. The best reflectivity of output mirror and small-signal transmission of the saturated absorber are confirmed to be 28% and 36%, the output energy and pulse width is 9.8 mJ and 9 ns, respectively. Based on above results, a 1064 nm laser output with single pulse energy of 8.6 mJ and pulse width of 9.7 ns was developed in the temperature range of 35-55 ℃ without refrigerating. The output instability is less than 5% for one array working and 12% for array switching.