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研究了一种长工作距离（117mm）、短焦距、在18～57mm范围内连续可变焦距的YAG激光加工机新型光学聚焦系统，论述了系统的特点及基本原理，给出了有关设计参数。
A new type of optical focusing system of YAG laser processing machine with long working distance (117mm), short focal length and continuous variable focal length in the range of 18 ~ 57mm was studied. The characteristics and basic principle of the system were discussed. Relevant design parameters were given.