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对于轴锥镜（ａｘｉｃｏｎ）透镜产生的无衍射光，它的中心光斑半径和无衍射光距离是固定的，一旦应用中要求新的光束参数，则只能再制造一个新的轴锥镜透镜。本文提出一种用普通球面透镜望远系统来改变无衍射光束参数的新方法。该方法是基于无衍射光和环光源之间的透镜变换关系。无衍射光首先被望远系统的第一块透镜变换为一个环光源，第二块不同焦距的透镜再将该环光源变换为一个不同参数的新无衍射光。新的光束参数由两个透镜的焦距比值决定。
For a non-diffracted light produced by an axicon lens, its center spot radius and the non-diffracted light distance are fixed and only a new axicon lens can be remanufactured if new beam parameters are required in the application. In this paper, we propose a new method to change the parameters of non-diffracted beams by the conventional spherical lens telecentric system. The method is based on the lens transformation between non-diffracted light and a ring light source. Non-diffracted light is first transformed into a ring light source by the first lens of the telephoto system, and the second lens of a different focal length is transformed into a new diffracted light of a different parameter. The new beam parameters are determined by the focal length ratio of the two lenses.