【摘要】 本文从理论上计算了高斯光束经透镜及光纤的传输特性，指出了当腔的参数ｚ＿ｏ＜＜ｆ时，高斯光束经透镜后的模斑位置严重偏离透镜的焦点。文中还指出为保证光纤弯曲时子午光线不漏出，对光纤的数值孔径有一定的要求。更多还原

【Abstract】 In this paper,the theoretical calculations of propagating behavior of laser beam through a fiber and lens are given. The analysis points out, if laser parameter z_o<<f,the image point of Gauss beam through lens will seriously deviate from the focus point of the lens. For the bent fiber,the N.A.(numerical aperture)should be larger enough to ensure the propagation of meridian light wi thout leaking.更多还原