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大口径高通量验证实验平台(以下简称ITB装置)是我国为开展惯性约束聚变(ICF)研究而研制的激光装置,单束输出能量达到了19.6 k J(基频发射波长为1053 nm,脉宽为5 ns)。对大口径N31钕玻璃片在ITB装置400 mm×400 mm单口径片状放大器系统上应用的热特性进行了实验研究,结果表明:在增益系数为5.28%cm~(-1)高增益情况下,整个激光链路热致动态波前畸变峰谷值dPV约为5.3λ,处于变形镜校正范围之内;结合合理设计冷却方案,剩余波前畸变恢复时间约为2.5 h,满足了系统运行发次间隔为4 h的设计要求。
The large-caliber high-throughput verification experiment platform (hereinafter referred to as ITB device) is a laser device developed by our country for the study of inertial confinement fusion (ICF). The output energy of a single beam reaches 19.6 kJ (fundamental emission wavelength is 1053 nm, pulse 5 ns wide). The thermal characteristics of a large diameter N31 neodymium glass sheet mounted on a 400 mm × 400 mm single-aperture chip amplifier system in an ITB plant were studied. The results show that with a gain of 5.28% cm -1 , The peak-to-peak dPV of the laser-induced thermal wavefront is about 5.3λ, which is within the scope of the anamorphic mirror. With reasonable design of the cooling scheme, the recovery time of the residual wavefront distortion is about 2.5 h, which meets the requirements of system operation Sub-interval of 4 h design requirements.