Chinese Optics Letters, Volume. 20, Issue 7, 071101(2022)

In-situ laser-induced surface damage inspection based on image super-resolution and adaptive segmentation method

Fengdong Chen1,*, Jingyang Sun1, Qian Wang1, Hongbo Zhu1, Fa Zeng2,**, Yueyue Han1, Cheng Lu1, and Guodong Liu1,***
Author Affiliations
  • 1Instrument Science and Technology, Harbin Institute of Technology, Harbin 150001, China
  • 2Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China
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    In-situ laser-induced surface damage inspection plays a key role in protecting the large aperture optics in an inertial confinement fusion (ICF) high-power laser facility. In order to improve the initial damage detection capabilities, an in-situ inspection method based on image super-resolution and adaptive segmentation method is presented. Through transfer learning and integration of various attention mechanisms, the super-resolution reconstruction of darkfield images with less texture information is effectively realized, and, on the basis of image super-resolution, an adaptive image segmentation method is designed, which effectively adapts to the damage detection problems under conditions of uneven illumination and weak signal. An online experiment was carried out by using edge illumination and the telescope optical imaging system, and the validity of the method was proved by the experimental results.

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    1. Introduction

    A promising and controllable way of inertial confinement fusion (ICF) is to focus high-power lasers to compress and heat a fuel capsule (target) positioned at the center of a vacuum target chamber to achieve fusion ignition. In-situ inspection of laser-induced damage (LID) on optics plays an important role for these high-power laser systems[1], because most large aperture optics within the beamline will be exposed to the high-energy laser pulse. Especially, in the final integrated optics module (IOM), the optics have higher risk to be damaged. The highlight of in-situ inspection is that it can detect and track the damage sites online[2] and then give an alarm when the LID sites grow to the point at which the optic should be removed to avoid destroying the optic or damaging downstream optics[3].

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    Fengdong Chen, Jingyang Sun, Qian Wang, Hongbo Zhu, Fa Zeng, Yueyue Han, Cheng Lu, Guodong Liu. In-situ laser-induced surface damage inspection based on image super-resolution and adaptive segmentation method[J]. Chinese Optics Letters, 2022, 20(7): 071101

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    Paper Information

    Category: Imaging Systems and Image Processing

    Received: Dec. 31, 2021

    Accepted: Apr. 8, 2022

    Published Online: Apr. 29, 2022

    The Author Email: Fengdong Chen (chenfd@hit.edu.cn), Fa Zeng (cengfa@tsinghua.org.cn), Guodong Liu (lgd@hit.edu.cn)

    DOI:10.3788/COL202220.071101

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