Thermal effect study of composite configuration grazing-incidence slab amplifier
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摘要: 为了研究复合结构掠入射板条放大器的热效应，采用在Nd:YVO4晶体抽运面上键合具有高热导率性能的蓝宝石的复合结构，并建立了相应的热力学模型，对激光介质的温度场分布、光程差（OPD）和热透镜效应进行了详细的理论分析，利用有限元分析软件COMSOL模拟了晶体内部的温度、应变、光程差（OPD）及热焦距的分布情况。结果表明，板条厚度为2 mm、键合层厚度1 mm、抽运功率60 W时，复合结构相对于单一结构最高温度下降了约50 K，晶体中的最大形变量降低超过了1/3，极大地降低了介质中的热效应。Abstract: To study the thermal effect of composite configuration grazing-incidence slab amplifier, a composite configuration was used, in which the Sapphire with high thermal conductivity was bonded on the pump face of the laser medium Nd:YVO4 crystal.The thermodynamic model of the grazing-incidence slab amplifier was built up. The temperature distribution, optical path difference and thermal lens effect were analyzed theoretically in detail. Also, the temperature distribution, thermal strain, optical path difference and thermal focal length were simulated by finite element analysis software COMSOL. The results indicate that compared with single medium structure, the maximum temperature of the composite configuration decreased by 60 K, and the maximum deformation of the pump face decreased by 1/3, while the pump power is 60 W, the thickness of the slab is 2 mm and the thickness of the bonding layer is 1mm. The novel composite configuration has reduced the thermal effect effectively.
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