• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2020, Vol. 56 ›› Issue (11): 202-218.doi: 10.3901/JME.2020.11.202

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New Progress of CO2 Laser Processing Techniquesfor Fused Silica Optics

ZHAO Linjie1,2, CHENG Jian1, CHEN Mingjun1, YUAN Xiaodong2, LIAO Wei2, YANG Hao1, LIU Qi1, WANG Haijun2   

  1. 1. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001;
    2. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900
  • Received:2019-08-16 Revised:2019-12-04 Online:2020-06-05 Published:2020-06-12

Abstract: Fused silica optics is a typical hard and brittle material, which is inefficient in traditional mechanical processing for the difficult-to-process materials. And the mechanical weakening layer produced on processed surface seriously affects the service life of fused silica optics in the conditions of strong impact, high load, and high energy. Compared with traditional mechanical processing, the advantages of CO2 laser processing technique are non-contact processing, high removal accuracy and high removal efficiency. Especially, the surface/subsurface cracks and scratches of fused silica optics processed by CO2 laser do not exist. CO2 laser processing technique has been widely used in processing of fused silica optics for these advantages. Therefore, this work reviews the development of CO2 laser processing technique for fused silica optics from four aspects, i.e., the CO2 laser processing theory of fused silica optics, the CO2 laser processing technology for large-aperture optical elements, the CO2 laser mitigating damages in local regions, and the CO2 laser processing of surface microstructures. The respective capabilities and application status of CO2 laser processing techniques for large-aperture or local region fused silica optics and surface microstructures have been analyzed. And the negative effects induced in CO2 laser processing and the problems needing to be solved discussed in detail. This work is expected to provide reference for further application of CO2 laser processing techniques for fused silica optics.

Key words: fused silica optics, laser processing, microstructure, surface modification, damage mitigation

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