Image relaying is presented as a technique for aligning beams onto mm-sized target of high power laser. On the basis of summarizing the preceeding work on the near-field image relaying of multiple spatial filters, the far-filed image relaying is suggested firstly. The near-field and far-field image relaying properties of multiple spatial filters in laser beams automatic alignment system are analyzed. A geometrical optics approach and an ABCD ray matrix theory are used throughout. The reasonable and optimum scheme for automatically aligning multi-pass beam paths is presented and demonstrated on the multi-pass amplifier system of the SG-III prototype.

Image relaying is presented as a technique for aligning beams onto mm-sized target of high power laser. On the basis of summarizing the preceeding work on the near-field image relaying of multiple spatial filters, the far-filed image relaying is suggested firstly. The near-field and far-field image relaying properties of multiple spatial filters in laser beams automatic alignment system are analyzed. A geometrical optics approach and an ABCD ray matrix theory are used throughout. The reasonable and optimum scheme for automatically aligning multi-pass beam paths is presented and demonstrated on the multi-pass amplifier system of the SG-III prototype.

The laser beams automatic alignment system is used to adjust beam lines automatically in the high power laser fa2cility for inertial confinement fusion. Image processing is one of the key techniques in laser beam automatic alignment. Consider2ing the SG-Ⅲ, combining different kinds of methods in image processing such as threshold, gravity model, median filter, cir2cle fitting and so on, a reasonable scheme for automatic alignment was presented. It was demonstrated on the simulation experi2ment system. Results indicated that beam paths adjustment can be finished in 15 minutes by the automatic alignment system.The precision of the near field adjustment was less than 0.5 % of the spot. The accuracy of the far field adjustment was lessthan 0.3″. Requirements of the SG-Ⅲprototype facility are met.

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.

Beam automatic alignment system is applied in high power laser facility for inertial confinement fusion. The basic principles and key techniques are researched. The evolution of beam automatic alignment systems abroad is introduced and the future development of the automatic alignment system in high power laser facility is prospected.

Laser beam automatic alignment systems are used to align the SG-Ⅲ prototype facility laser. Considering the facility qequirement, combining the key technique of automatic alignment, according to the image relay of the pinhole, utilizing the optical position and the spatial location of the four pinholes of the main spatial filter in the four-pass beam in the SG-Ⅲ, this paper presents a reasonable scheme for automatic aligning in the four-pass amplifier, which has been fully checked on the multi-pass amplifier experiment system.The centering sensitivities of the system are less than 0.5% of the beam diameter. The pointing sensitivities of the system are less than 10μm.

Alignment accuracy of the cavity mirror in multipass amplifier is very high. Aiming at the requirements on alignment precision of cavity mirror in high power lasers, using image relaying of pinholes and the principle of beam automatic alignment, a scheme to align the cavity mirror is designed. It has been demonstrated on the simulation experiment system of the SG-Ⅲ prototype facility. The main amplifier's adjustment can be finished in 15min. The centering precision of the system is less than 0.5% of the beam diameter. The pointing precision of the system are less than 0.3".

光束自动准直系统应用于惯性约束聚变的高功率激光装置,研究了光束自动准直的原理和关键技术,介绍了国外光束自动准直系统的发展状况,展望了高功率激光装置自动准直系统的未来发展趋势。

针对高功率激光装置对多程放大器腔镜准直的要求，利用小孔的像传递和光路自动准直的原理，设计出一套创新的腔镜准直调整方法，并且在SG-Ⅲ原型装置4程放大模拟实验平台上进行了实验验证。实验结果表明：自动准直系统能够在15 min之内顺利完成主放大级系统的光路调整，光束近场调整精度值小于近场光斑直径的0.5%，光束远场调整精度小于0.3"。

激光束光路自动准直系统用于神光-Ⅲ原型装置光束精密准直.针对神光-Ⅲ原型的总体要求和主光路,结合光路自动准直的关键技术,充分考虑了其4程放大主空间滤波器的4个小孔空间分布和光学位置的特点,利用小孔像传递的原理,设计出一套优化、合理的4程放大的光路准直总体方案,并且在多程放大实验平台上得到了充分的验证和考核.