Damage analysis and mechanism study of sol-gel coating over KDP crystal under multi-pulse of laser irradiation at low flux.

Autor: You TH; Department of Physics, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China., Yang W; Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China., Hui HH; Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China., Lei XY; Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China., Wang TY; Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China., Zhang QH; Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China., Ju X; Department of Physics, University of Science and Technology Beijing, Beijing, 100083, People's Republic of China. jux@ustb.edu.cn., Deng XR; Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, People's Republic of China. xrdeng@foxmail.com.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2023 Mar 01; Vol. 13 (1), pp. 3451. Date of Electronic Publication: 2023 Mar 01.
DOI: 10.1038/s41598-022-25168-4
Abstrakt: 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 TO 3 was observed at vibration mode peaks of 1064 cm -1 and 1096 cm -1 showing 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.
(© 2023. The Author(s).)
Databáze: MEDLINE
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