拱形激光二极管侧抽运Nd∶YAG固体激光器的实验研究

详细阐述了同心抽运、同心冷却的激光二极管紧包侧抽运Nd∶YAG激光器的实验研究工作。这种抽运结构使晶体内的增益场与谐振腔基模实现了良好的匹配,易于得到良好的光束质量和大能量输出,基模提取效率高。模拟分析了晶体内的增益场以及横截面内的温度分布,从不同角度探讨了激光二极管的温度特性对器件工作的影响。研究了晶体的热致退偏效应对器件调Q工作的影响,并且初步探讨了不同腔长、不同腔型下器件的工作情况,这些实验结果对进一步优化使用这种抽运结构有指导意义。所设计的激光器在工作频率6Hz时,得到了斜效率为44.3%的多模调Q输出。在抽运能量735mJ时,得到最大输出能量135mJ,脉宽7.6ns的调Q脉冲,光光效率为18.4%,插头效率为11.0%,光束发散角小于1.5mrad。

Experimental Study for an Arched Diode-Side-Pumped Nd∶YAG Lasers

The characterization of an arched diode-side-pumped Nd∶YAG laser was reported. A concentric-pumping and concentric-cooling close configuration was used for the laser. The pump light distribution and temperature profile were calculated and optimized. Influence of the laser diode chirp and sag on the laser output, the effect of thermal birefringence on the laser Q-switch output and laser output under different resonator length and different cavity have been studied. A maximum output of 135 mJ in multimode Q-switch operation is obtained with pumped energy 735 mJ (marked value). The pulse width is 7.6 ns and the full divergence angle is smaller than 1.5 mrad. The slope efficiency is 44.3%. The optical-optical efficiency is 18.4%.