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- Title
Damage analysis and mechanism study of sol–gel coating over KDP crystal under multi-pulse of laser irradiation at low flux.
- Authors
You, Teng-Hui; Yang, Wei; Hui, Hao-Hao; Lei, Xiang-Yang; Wang, Tian-Yu; Zhang, Qing-Hua; Ju, Xin; Deng, Xue-Ran
- Abstract
The purpose of this study is to analyze the damage of antireflective (AR) coating over potassium dihydrogen phosphate (KDP) crystal subjected to multi-pulse laser irradiation at low flux under vacuum. Fresh silica AR was characterized as a reference; Atomic Force Microscope (AFM), Scanning Electron Microscopy (SEM), profilometer, and Scanning Near-Field Optical Microscope Photo-induced Force Microscope (SNOM-PiFM) were employed to analyze the characteristics of coatings. The experimental results indicated that the damage of AR coating over the KDP crystal was mainly caused by partial exfoliation, which exposed silica particles beneath the surface. It was found that the accumulated tensile stress led to coating damage with the increase of laser pulse. The initial coating damage was observed to extend and interconnect to form large-area exfoliation. Splitting mechanism of SiO–Si TO3 was observed at vibration mode peaks of 1064 cm−1 and 1096 cm−1showing progressing irradiation damage. Based on this study, it would be helpful to suppress the damage probability of AR coating over KDP crystal applied in high-power laser systems. Moreover, the applicability of SNOM-PiFM method to study the Infrared Radiation (IR) spectra of ultra-thin coatings with transparent substrates was proposed.
- Subjects
POTASSIUM dihydrogen phosphate; ATOMIC force microscopes; INFRARED radiation; OPTICAL microscopes; ANTIREFLECTIVE coatings; SURFACE coatings; CRYSTALS; SCANNING electron microscopy
- Publication
Scientific Reports, 2023, Vol 13, Issue 1, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-022-25168-4