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During laser micro-polishing, the constant control of laser energy density isa key technology to improve the surface roughness. In this paper, a methodwhich controls the energy density of UV(ultraviolet) pulse laser in real timewith the control of CW(continuous wave) laser spot size in lasermicro-polishing for metallic surface was presented. The experimental andanalytical considerations of several influence factors such as laser spot size,fusion zone and focal offset were investigated. In addition, using a lasermicro-polishing system manufactured with this method, the laser micro-polishingexperiments on the two different surface shapes of stainless steel 316L wereconducted. For the inclined or curved surface, the surface roughnessimprovements of up to 56.4% and 57.3% were respectively obtained, and theanalysis of the results were discussed.

A method of laser micro-polishing for metallic surface using UV nano-second pulse and CW lasers