提出一种基于猫眼腔镜损耗调节的新型激光横模演示系统。采用半外腔He－Ne激光器，利用由分立的可进行五维微调的凸透镜和凹面镜组成的猫眼逆向器构成损耗可调激光谐振腔，通过调节猫眼逆向器改变激光谐振腔的损耗比，实现改变激光横模状态的作用。利用CCD进行图像采集，计算机实现图像存储，从而得到20多种结构清晰的高阶横模花样图片。

A new laser transverse mode demonstration system based on the loss adjustment of a cat-eye reflector is presented in this paper. A cat-eye corner reflector made up of a convex lens and a concave mirror adjustable in five degrees of freedom was used to form a lasing chamber capable of adjusting the loss. The change of the state of the laser transverse mode was realized by changing the loss factor of the lasing chamber through adjusting the cat-eye corner reflector.When one or some position parameters of the convex lens or the concave mirror were changed,the power loss and the symmetry of the laser resonator produced the relative changes of diffraction losses. Over twenty clear high-order transverse mode images were collected by CCD and stored in computer.