【摘要】 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。更多还原

【Abstract】 A novel VFL (variable focal length) system of a long working length(117mm), a short focus and a continuous zoom type range from 18mm to 57mm is studied. The features and basic principles of the system are discussed, and the design parameters are given.更多还原