高平均功率开关晶体热力学特性有限元分析
Finite element analysis of thermal distortion of electro-optic crystal for high average power laser systems
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摘要: 基于有限元数值方法，就不同的光强分布模型以及电光晶体固定或自由的边界条件，模拟分析了KDP，DKDP，LiNbO3，BBO开关晶体材料在高平均功率激光负载下的热力学特性。结果表明:激光作用数s后，温升分布基本与光强分布一致；晶体表面的最大轴向位移和最大拉应力随光斑填充因子增大而增大;晶体的力学边界约束对最大轴向位移及最大拉热应力的影响随着光斑填充因子的增大而增强;在相同的入射激光光源及相同的边界条件下,KDP上的温升最大，热畸变最严重，DKDP次之，而LiNbO3和BBO具有较低的温升值或较低的热形变和热应力。Abstract: The thermodynamics of electro-optic switches with such materials as KDP, DKDP, LiNbO3 and BBO is analyzed by use of finite element methods with different laser intensity distributions such as the Gaussian, super-Gaussian under two mechanical boundaries, the free boundary and the fixed boundary independently. The results indicate that the ultimate axial displacements on the surfaces of the crystal increase with the increase of the order of Gaussian beams while the crystal has free boundaries, and the ultimate thermal stress in the crystal increases with the increase of the order of Gaussian beams while the crystal has fixed boundaries. The influences of the tackling states on these two parameters increase while the order of Gaussian beams increases. Irradiated by the same laser source and u
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