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激光二极管抽运的固体激光器(DPSSL)成为实现下一代激光器驱动装置对能量转换效率和重复频率要求的重要途径。高重复频率导致介质内存在热积累,引起热光效应、弹光效应和形变,导致波前畸变的产生,影响光束质量。针对目标输出能量100J,重复频率10Hz的放大模块,分析其储能提取效率和增益性能,采用气体冷却技术,设计激光二极管抽运的片状放大模块结构。利用有限元数值分析方法,建立了该装置单片放大器热分析模型,研究了单片增益介质厚度、对流换热系数对波前畸变的影响,结合波前畸变的要求,得到了单片厚度的最优值,并对该设计进行热分析,利用超高斯光束近似抽运光源,结合氦气气流分布情况,模拟单片介质的温度、形变和应力分布,计算得到了热光效应、形变和弹光效应对波前畸变的贡献以及单片增益介质的总波前。
Laser diode-pumped solid-state lasers (DPSSLs) are an important way to achieve the next generation of laser drivers for energy conversion efficiency and repetition rate requirements. The high repetition rate leads to the accumulation of heat in the medium, which causes the thermo-optic effect, the pop-up effect and the deformation, resulting in the wavefront distortion and the beam quality. For the target output energy of 100J, repetition frequency of 10Hz amplification module, analysis of its energy storage efficiency and gain extraction performance, the use of gas cooling technology, the design of laser diode pumping chip amplifier module structure. The thermal analysis model of the monolithic amplifier was established by means of finite element numerical analysis. The influence of monolith gain medium thickness and convection heat transfer coefficient on wavefront distortion was studied. Combined with the requirement of wavefront distortion, the monolithic thickness And the thermal analysis of this design was carried out. The temperature, deformation and stress distribution of the single-piece medium were simulated by using the super-Gaussian beam to approximate the light source and the distribution of helium gas flow. The thermal-optical effect, The contribution of the optical effect to the wavefront distortion and the total wavefront of the monolithic gain medium.