对高斯光束通过锥镜产生类似贝塞尔光束的环形光束进行了理论分析及实验研究．数值模拟过程中，基于相干光干涉理论，考虑到实际情况中锥尖不尖带来的影响，建立了三光束干涉的数学模型．模拟得到的光场分布与实验结果及基于菲涅尔衍射积分理论或空间光谱理论得到的零阶贝塞尔光束很接近．这种光场具有非衍射特性，可应用于新型光镊研究．

A model of three-beam interference has been set up to explain the observed beam patterns which are generated by Gaussian beam passing through an axicon. The mathematical simulation is based on interferential theory,and the effect of the vertex of the axicon. is also considered. The derived equation for describing the transverse intensity distribution gives good approximation to the experimental result as well as the zero-order Bessel function. This beam is characteristic of non-diffraction and can be used to study the newly-type optical tweezers.