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激光二极管抽运的全固态激光器中,除了激光介质的温度分布和热透镜效应以外,抽运、冷却结构对获得高光束质量、高功率激光输出至关重要。基于热传导方程,在相同的抽运功率和传导冷却边界条件下,对单侧面抽运锯齿形(zigzag)板条、单侧面键合锯齿形板条、部分抽运板条三种不同抽运结构的温度分布、热致应力、温度导致的折射率变化进行了详细的分析,并通过光线追迹方法,比较了光束在锯齿形面内和垂直于锯齿形面内的光程差,由光程差曲线分析了激光束的热透镜效应。对三种抽运结构的端面温度、端面变形和端面变形导致的光程差也进行了对比分析。结果表明,三种抽运结构在锯齿形面内的光束均表现为发散特性,在垂直于锯齿形面内的光束表现为热聚焦效应,温度导致的热聚焦特性相差不是很大。而在消除端面效应方面,键合激光板条具有明显优势。最后,提出了热透镜效应的补偿方法。
In laser diode pumped all-solid-state lasers, pumping and cooling structures are crucial for achieving high beam quality and high-power laser output, in addition to the temperature distribution of the laser medium and the thermal lensing effect. Based on the heat conduction equation, under the same pumping power and conduction cooling boundary conditions, three types of pumping structures, ie, zigzag slats, unilateral jagged slats and partially pumping slats The temperature distribution, thermal stress and temperature-induced refractive index change were analyzed in detail. The optical path difference of the light beam in the zigzag plane and in the zigzag plane was compared by ray tracing method, The difference curve analyzes the thermal lens effect of the laser beam. The optical path difference caused by the end face temperature, the end face deformation and the end face deformation of the three pumping structures are also compared. The results show that the light beams in the zigzag plane of the three pumping structures all exhibit divergence characteristics, and the light fluxes in the zigzag plane appear as the thermal focusing effect. The temperature difference between the thermal focusing characteristics is not large. And in the elimination of the end effect, bonding laser slats has obvious advantages. Finally, the thermal lens compensation method is proposed.