钕玻璃激光放大片在热恢复后的剩余温度场对于光束退偏和波前畸变具有重要的影响。当冷却过程中出现不对称情形，将导致剩余温度场的不对称，从而影响到高功率激光光束发次之间的重复性。本文在对N41型钕玻璃四周包边侧弱冷和强冷所导致的剩余温度场分布特征进行模拟分析的基础上，重点研究了包边侧不对称冷却所导致的剩余温度场的变化。这种变化的程度与钕玻璃四周包边侧冷却的强弱有关，并进一步分析了由弱冷转为强冷时钕玻璃激光放大片的通光面和四周包边界面上各自的散热量。

Beam positioning stability in a laser-driven inertial confinement fusion (ICF) facility is a vital problem that needs to be fixed. Each laser beam in the facility is transmitted in lots of optics for hundreds of meters, and then targeted in a micro-sized pellet to realize controllable fusion. Any turbulence in the environment in such long-distance propagation would affect the displacement of optics and further result in beam focusing and positioning errors. This study concluded that the errors on each of the optics contributed to the target, and it presents an efficient method of enhancing the beam stability by eliminating errors on error-sensitive optics. Optimizations of the optical system and mechanical supporting structures are also presented.

Beam positioning stability in a laser-driven inertial confinement fusion (ICF) facility is a vital problem that needs to be fixed. Each laser beam in the facility is transmitted in lots of optics for hundreds of meters, and then targeted in a micro-sized pellet to realize controllable fusion. Any turbulence in the environment in such long-distance propagation would affect the displacement of optics and further result in beam focusing and positioning errors. This study concluded that the errors on each of the optics contributed to the target, and it presents an efficient method of enhancing the beam stability by eliminating errors on error-sensitive optics. Optimizations of the optical system and mechanical supporting structures are also presented.

为了研究高功率固体激光器光束指向的漂移情况，根据原型装置打靶误差预算中各部分的权重，分析了主放光路输出光束允许的角度漂移误差，即主放输出光束的角漂不超过10．6μrad。实验中选取了其中的一束，主放远场测量系统在37min内共采集到了144发次的远场图像，在MATLAB编程中使用阈值法和重心法处理每帧远场图像，将光束的漂移量在x和y方向上分解，利用均方根的概率统计方法，计算得到了主放输出光束的角度漂移误差，x方向为3．47μrad，y方向为4．09μrad。实验结果表明，主放光路的稳定性达到了设计指标，能够满足打靶要求。