摘要 激光致反射镜热变形引起光束质量下降是强激光系统优化设计的关注热点。为了在不同反射膜和不同基底的多种材质组合中筛选出热变形最小的情况,对反射镜热变形特性开展了理论分析,讨论了激光参数的影响。首先模拟了不同反射镜的温升和热变形,发现温升和热变形的最大位置始终位于被激光辐照镜面上;然后筛选出热变形最小的镜体组合是镀Ag膜的硅基底反射镜,并且随着入射激光波长的增大,反射镜温升变小,热变形量也减小;激光功率越小,反射镜的温升越低,热变形量越小;激光光斑半径越大,最大热变形量越小。研究结果可以为反射镜的优化设计,以及反射镜的激光损伤等方面提供理论参考。 It is the focus of the optimization design of intense laser systems that laser will cause thermal deformation of the reflector and further decrease the beam quality.In order to select the minimum thermal deformation from the combination of different reflective films and different substrates,the thermal deformation characteristics were analyzed by theories,as well as the effects of laser parameters.The temperature rise and thermal deformation of the reflector were simulated;the maximum position of the temperature rise and the thermal deformation were all located on the reflector’s surface irradiated by laser.The reflector with the smallest thermal deformation was selected as the silicon substrate reflector with Ag coating.In addition,i t is found that with the increase of the incident laser wavelength,the temperature rise of the reflector becomes smaller and the thermal deformation decreases;The temperature rise and the thermal deformation of the mirror are getting decreased,with the increase of the incident laser wavelength or the decrease of laser power.If the laser spot radius gets larger,t he maximum thermal deformation will get smaller.The results of this paper can provide a theoretical reference for the optimization design of the reflector and the laser damage of the reflector.
机构地区 长春理工大学理学院
出处 《长春理工大学学报:自然科学版》 2021年第2期13-17,共5页 Journal of Changchun University of Science and Technology(Natural Science Edition)
基金 吉林省科技发展计划项目(20170520128JH,20190101005JH)。
