光路自动准直系统用于惯性约束聚变的高功率激光装置的光束精密自动准直调整.针对神光Ⅲ原型装置四程放大光路对自动准直系统的调整时间和调整精度的要求,考虑到光路总体结构的要求,利用光纤像传递和光纤耦合技术,结合近场远场像传递原理,使用插入式光纤点光源实现了后腔镜的准直调整,充分考虑了四程放大的光路像传递特点,设计出一套优化合理的四程放大准直方案,并且在神光Ⅲ原型装置模拟实验平台上得到了充分的验证和考核.实验结果表明光路自动准直系统能够在15 min之内顺利完成系统的光路调整,光束近场调整精度优于近场光斑的±0.5%,光束远场调整精度≤±0.3",满足了原型装置总体的要求.

The laser beams automatic alignment system is acyusting to adjust beam lines accurately in the high power laser facility for inertiai confinement fusion. Considering the requirements on alignment time and alignment precision of the SG-III prototype facility, using techniques on image fiber and transmission fiber, combining the image relaying principle of near field and far field, innovating in cavity mirror adljustment by using inserted fiber light source, utilizing the characteristic of image relaying in four-pass amplifiers, a reasonable and optimized scheme for automatic aligning four-pass beam paths is presented It has been demonstrated on the simulation experiment system of the SG-III prototype facility. Results indicate that beam paths acyustment can be finished in 15 minutes by the automatic alignment system. The precision of the near field acUustment was less than 0.5% of the spot The accuracy of the far field adljustment was less than 0.3". Requirements of the SG-III prototype facility are met.