脉冲压缩光栅的激光损伤机理及阈值提升技术研究进展

总结了激光辐射条件下脉冲压缩光栅的激光诱导损伤机理，探究了表面形貌、加工方式、结构缺陷以及表面污染等因素对光栅损伤造成的影响，从微观损伤机理的角度阐释了产生损伤的内在原因。在脉冲压缩光栅的激光预处理、加工工艺及表面污染物的去除等方面，分析了实现光栅损伤阈值提升的内在因素，给出了提升光栅损伤阈值的技术措施。根据影响光栅损伤阈值的因素，提出在光栅运行过程中采用多种措施组合的方式来提升光栅的激光诱导损伤阈值。脉冲压缩光栅激光损伤机理和阈值的研究对脉冲压缩光栅系统的稳定运行具有实践意义，为激光装置高能量密度的输出奠定基础。最后，提出了光栅激光诱导损伤研究的科学与技术问题，为脉冲压缩光栅激光诱导损伤阈值的提升提供新的思路，服务于重大科学装置和重要技术领域的发展。

Research progress on laser-induced damage mechanism and threshold improvement of pulse compression gratings

The damage of pulse compression gratings is the key factor offecting the stable operation and power improvement of chirped pulse amplification system. In this paper, the laser-induced damage mechanism of pulse compression grating under laser radiation is summarized, the effects of surface morphology, processing mode, structural defects and surface pollution on grating damage are explored, and the internal causes of damage are explained from the perspective of micro damage mechanism. In the aspects of laser pretreatment, processing technology and surface pollutant removal of pulse compression grating, the internal factors to improve the grating damage threshold are analyzed, and the technical measures to improve the grating damage threshold are given.  A combination of various measures is proposed to improve the laser-induced damage threshold of the grating. The research on laser damage mechanism and threshold of pulse compression grating has practical significance for the stable operation of pulse compression grating system and lays a foundation for the output of high energy density of laser device. Finally, this paper puts forward the scientific and technical problems of grating’s laser-induced damage research, which provides  new ideas for improving the laser-induced damage threshold of pulse compression grating, and help the development of major scientific devices and important technical fields.