论文部分内容阅读
对Bounce抽运结构的高功率板条激光放大器进行热仿真,采用有限元数值分析获得了放大光束通过板条后的光程差分布,利用二阶矩法计算出Bounce抽运热效应引入的相位畸变对光束质量M2的影响,为放大链路热效应的补偿给出指导。在采用高效传导冷却设计的三级板条级联放大链路实验装置中,实验测得的每一放大级热焦距值与理论预期吻合良好。当放大器链路工作在250Hz重复频率时,插入热补偿中继光路,最终获得单脉冲能量537mJ的输出,光束质量因子M2x=2.35,My2=2.66。
Thermal simulation of a high-power slab laser amplifier with a Bounce pumping structure was performed. The optical path difference distribution of the amplified beam passing through the slab was obtained by finite element numerical analysis. The phase distortion introduced by the Bounce pumping thermal effect was calculated by the second moment method On the beam quality M2, to give guidance on compensating for the thermal effects of the amplification link. In the three-stage cascaded amplifier with high-efficiency conductive cooling design, the experimental results show that the thermal focal length of each amplifier is in good agreement with the theoretical prediction. When the amplifier link operates at a repetition rate of 250 Hz, a thermal compensation relay is inserted into the optical path, resulting in an output of 537 mJ with a single pulse energy. The beam quality factor M2x = 2.35 and My2 = 2.66.