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对应用于惯性约束聚变(ICF)激光驱动器的新型N41大口径钕玻璃片在高增益条件下的热效应进行了系统研究。实验结果表明,在平均小信号净增益系数达到0.0525cm-1的高增益情况下,385mm×385mm口径范围内两片双程的热致动态波前畸变的峰-谷值约为0.84λ(λ=1053nm),处于变形镜校正范围之内;基于目前的冷却方案,剩余波前畸变的恢复时间约为2.5h,满足系统每4h发射一次的设计要求;每次发射7h后,系统内仍存在热气体对流引入的微小畸变;理论预测结果与实验结果一致。该研究为下一代ICF激光驱动器内片状放大器系统的研制提供了实验参考。
The thermal effects of the new N41 large-diameter neodymium glass plate used in the ICF laser driver under high gain conditions were studied systematically. The experimental results show that the peak-valley value of the two-pass thermal-induced wavefront aberration of the two-way 385mm × 385mm aperture is about 0.84λ when the average small signal gain coefficient reaches 0.0525cm-1 = 1053nm), within the scope of the anamorphic mirror correction. Based on the current cooling scheme, the recovery time of the residual wavefront distortion is about 2.5h, which meets the design requirements of the system once every 4h. After each launch, the system still exists The small distortion introduced by convection of hot gas; the theoretical prediction result is consistent with the experimental result. The research provides an experimental reference for the development of the chip amplifier system in the next generation ICF laser driver.