高功率激光装置透镜误差对鬼像点位置的敏感性研究

Study on Sensitivities of Ghost Images to Lens Fabrication Errors in High Power Laser Facilities

作为对高功率激光装置中鬼像的进一步深入研究,在原有鬼像研究的基础上,考虑单透镜鬼像对实际加工、安装中误差的敏感性。运用矩阵光学的方法,推导得到了鬼像点的近似焦距公式,以及由误差引起的鬼像点位置的增加量的一般性表达式。以神光Ⅱ升级装置中终端光学组件的聚焦透镜参数为例对公式作数值分析,结果表明,透镜曲率半径和中心厚度误差对鬼像的影响较小,部分情况下可以忽略;而中心误差对鬼像的影响很明显,在工程设计中应予以重视。

As the further discussion on the ghost images in high-power laser facilities,the sensitivities of the ghost images focal positions to lens fabrication errors are analyzed based on the traditional studies.The general expression of ghost images focal length is deduced approximately,and the relation between shifts of ghost images focal position and errors of lens parameters are calculated based on the matrix optics.The numerical calculation results by taking the focal lens of the final optical assembly in SG-Ⅱ upgraded system as example indicate that the ghost images are sensitive to the lens central errors,but insensitive to the errors of curvature radius and center thickness.It can offer the reference in optical designs.