热效应仍是限制激光放大器向高功率、高光束质量进一步发展的瓶颈问题,高效的热管理是抑制热效应的重要技术途径.研究了基于激光二极管抽运氦气冷却的钕玻璃叠片激光放大器的热效应.利用有限元数值模拟的方法,分析了钕玻璃的温度、应力应变和应力双折射分布,并计算了热致波前畸变和退偏损耗,与实验结果符合得较好,在热沉积为0.7 W/cm3的条件下,6片钕玻璃总的热致波前畸变为6.77λ,最大退偏量大于90%. Thermal effect is still the bottleneck that limits the further development of high power and high beam quality of laser amplifier, and efficient thermal management is an important technical way to suppress the thermal effect.It is studied that the thermal effect of neodymium glass laminated laser amplifier based on laser diode pumping helium cooling The distribution of temperature, stress and strain and stress birefringence of neodymium glass were analyzed by means of finite element numerical simulation, and the distortion and demagnetization loss of thermal induced wave were calculated, which is in good agreement with the experimental results. When the thermal deposition is 0.7 Under the condition of W / cm3, the total thermotropic wavefront distortion of 6 neodymium glasses is 6.77λ, and the maximum depolarization amount is more than 90%.