论文部分内容阅读
基于0.53μm、1.06μm激光双波长复合输出技术在军事上的应用前景,针对光电对抗双波长复合输出激光器的热效应,利用泊松热传导理论,考虑晶体与外界的热交换,建立了更精确的边界条件,仿真分析了三向泵浦、内腔倍频情况下激光晶体热透镜效应和倍频晶体热致相位失配的形成过程,分析讨论了平凸腔补偿热透镜效应的有效性和一般规律。通过实验探究了热效应对双波长复合激光光束质量的影响,验证了平凸腔对热效应的补偿效果,发现平凸腔能增大基模模体积,抑制高阶模增益,改善复合激光光束质量,热效应补偿效果会随着补偿平凸镜曲率半径的减小而增强。
Based on the military application of 0.53μm and 1.06μm laser dual-wavelength composite output technologies, aiming at the thermal effect of the optoelectronic counter-dual-wavelength compound output laser, the Poisson’s theory of heat conduction and the heat exchange between crystal and the outside are used to establish a more accurate boundary Conditions, the forming process of the thermal lens effect of the laser crystal and the thermal induced phase mismatch of the frequency doubling crystal in the three-way pump and the cavity doubler are simulated and analyzed. The effectiveness and general rule of the plano-convex cavity for compensating the thermal lens effect are analyzed and discussed . The effects of thermal effects on the laser beam quality of dual-wavelength laser are investigated experimentally. The compensation effect of the planar cavity on the thermal effect is verified. It is found that the cavity can increase the volume of the fundamental mode, suppress the gain of high-order mode, improve the quality of the laser beam, The effect increases as the radius of curvature of the compensated planoconcave lens decreases.