Study on coating exfoliation damage of KDP component under laser irradiation by surface analysis

You, Teng-Hui; Li, Xiang-Cao; Ju, Xin

doi:10.1016/j.apsusc.2022.154255

Cited by 3 publications

(2 citation statements)

References 40 publications

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“…Therefore, the sol prepared in “ Preparation of colloidal silica sol ” section was spin-coated over KDP crystals (50 mm × 50 mm × 10 mm) under a velocity of about 300 rpm at a rated time of 80 s to modulate the coating thickness to the designed value (~ 70 nm) 17 – 20 . The test results of coating thickness and laser damage threshold can be found in literature 14 . The resulting coating was used as reference (named as coating A).…”

Section: Methodsmentioning

confidence: 99%

“…In summary, this type of laser coating damage is noticed recently and found very harmful for the transmission and lifetime of KDP/DKDP component, but studies aimed at this specific coating failure can be hardly found. In our previous work 14 , a series of structural changes in the coating damage process was analyzed, including the adhesion changes of the interface layer. It was found that the conversion behavior of Si–O–Si to Si–O–K at the interface during the damage process led to the enhancement of adhesion of the coating, which was very crucial to the coating damage.…”

Section: Introductionmentioning

confidence: 99%

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

You

Yang

Hui

et al. 2023

Sci Rep

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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.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

You

Yang

Hui

et al. 2023

Sci Rep

Self Cite

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Damage regularity and multifractal analysis of sol‐gel reflection coating of KDP crystal under low UV irradiation flux

You,

Dai,

et al. 2024

Microscopy Res & Technique

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This study employed multifractal analysis to investigate the changes in surface morphology of SiO2 anti‐reflective coatings prepared on KDP substrates using the sol‐gel method, under various conditions of ultraviolet (UV) irradiance. The coatings were successfully fabricated, and the chemical structure of the SiO2 sol was comprehensively characterized using Solid‐State Nuclear Magnetic Resonance (SSNMR) technology. Under low UV irradiance (4 J/cm2), repeated experiments revealed a crack‐induced mechanism of surface fatigue damage. Utilizing Scanning Electron Microscopy (SEM), the study discovered the induction effect of initial crack defects in UV‐damaged coatings and established a damage model. Furthermore, Atomic Force Microscopy (AFM) was used to acquire images of the coatings' surface morphology at different damage levels, which were analyzed using the multifractal spectrum f(α). This analysis confirmed the multifractal nature of the coatings both before and after damage. This study identified significant effects of UV irradiation on the width of the multifractal spectrum and Δf, indicating that the SiO2 anti‐reflective coatings exhibit multifractal characteristics under various damage states. The coatings displayed a pattern of decreasing and then increasing singularity spectrum width, height distribution unevenness, and surface roughness with increasing damage. This study demonstrates that multifractal analysis is an effective tool for describing the complexity of the surface morphology of sol‐gel‐derived anti‐reflective coatings for the first time and for validating their multifractal properties across different stages of UV damage.Highlights Damage dynamic process of KDP crystal sol‐gel coating was described by SEM&AFM; The crack propagation mechanism of sol‐gel coating under UV radiation is proposed; The damage evolution of sol‐gel coating was described by multifractal analysis.

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Study on UV-laser fatigue damage of sol-gel antireflective coating using XPS and slow positron beam Doppler broadening spectrum

You

Yang

Wang

et al. 2023

Vacuum

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Study on coating exfoliation damage of KDP component under laser irradiation by surface analysis

Cited by 3 publications

References 40 publications

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

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

Damage regularity and multifractal analysis of sol‐gel reflection coating of KDP crystal under low UV irradiation flux

Study on UV-laser fatigue damage of sol-gel antireflective coating using XPS and slow positron beam Doppler broadening spectrum

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