Main > Chinese Optics Letters >  Volume 19 >  Issue 4 >  Page 041402 > Article
  • Abstract
  • Abstract
  • Figures (6)
  • Tables (0)
  • Equations (12)
  • References (24)
  • Get PDF
  • View Full Text
  • Paper Information
  • Received: Aug. 20, 2020

    Accepted: Oct. 9, 2020

    Posted: Jan. 4, 2021

    Published Online: Jan. 8, 2021

    The Author Email: Mingjun Chen (chenmj@hit.edu.cn), Jian Cheng (cheng.826@hit.edu.cn)

    DOI: 10.3788/COL202119.041402

  • Get Citation
  • Copy Citation Text

    Chao Tan, Linjie Zhao, Mingjun Chen, Jian Cheng, Zhaoyang Yin, Qi Liu, Hao Yang, Wei Liao. Combined studies of surface evolution and crack healing for the suppression of negative factors during CO2 laser repairing of fused silica[J]. Chinese Optics Letters, 2021, 19(4): 041402

    Download Citation

  • !Citations Alert
  • Category
  • Lasers, Optical Amplifiers, and Laser Optics
  • Share
Chinese Optics Letters, Vol. 19, Issue 4, 041402 (2021)

Combined studies of surface evolution and crack healing for the suppression of negative factors during CO2 laser repairing of fused silica

Chao Tan1, Linjie Zhao1, Mingjun Chen1,*, Jian Cheng1,**, Zhaoyang Yin1, Qi Liu1, Hao Yang1, and Wei Liao2

Author Affiliations

  • 1Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China

Abstract

In order to reveal the evolution mechanism of repaired morphology and the material’s migration mechanism on the crack surface in the process of CO2 laser repairing surface damage of fused silica optics, two multi-physics coupling mathematical models with different scales are developed, respectively. The physical problems, such as heat and mass transfer, material phase transition, melt flow, evaporation removal, and crack healing, are analyzed. Studies show that material ablation and the gasification recoil pressure accompanying the material splash are the leading factors in forming the Gaussian crater with a raised rim feature. The use of low-power lasers for a long time can fully melt the material around the crack before healing, which can greatly reduce the size of the residual air layer. Combined with the experimental research, the methods to suppress the negative factors (e.g., raised rim, deposited debris, air bubbles) in the CO2 laser repairing process are proposed.

keywords

Please Enter Your Email: