Experimental study on laser microstructures using long pulse. (March 2016)

• Record Type: Journal Article
• Authors: Zhou, Jing; Shen, Hong; Pan, Yanqing; Ding, Xiaohong
• Is Part Of: Optics and lasers in engineering. Volume 78(2016)
• Page Start: 113
• Page End: 120
• Publication Date: 2016-03
• Subjects: Laser texturing -- Long pulse -- Surface topography -- Ablation volume -- Underwater; Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2015.10.009
• Languages: English
• ISSNs: 0143-8166

Abstract

Abstract: Laser surface texturing has applications in mechanical, medical and electrical industries. Many experiments using the short pulsed laser in air have been performed. In this study, the mechanism of the microstructure produced by using the long pulsed laser from the bump to the dimple is analyzed, in which the surface tension is dominant for the bump shape. The microstructure produced underwater is more regular than the one in air because the spatter of material on the entrance disappears. Due to additional mechanical impacts, liquid-assisted ablation efficiency with a water layer of 0.5 mm shows upto four times higher ablation volume than that in air. More heat dissipation with a thicker liquid layer reduced ablation efficiency. Highlights: The transformation of the microstructures using a long pulse laser is analyzed. The regular shape of the microstructure is obtained by processing underwater. The ablation volume becomes smaller with the higher energy processed in air. The ablation efficiency can be greatly improved by the water-assisted method.