Mr. Sunlin Xiang Profile

Sunlin Xiang

at Soochow University

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Publications (2)

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Proceedings Article | 2 December 2020 Paper

The light modulation of scratches on the surface of fused silica glass

Hongyu Wang, Sunlin Xiang, Baoxing Xiong, Fan Gao, Xiang Zhang, Xiao Yuan

Proceedings Volume 11717, 117172R (2020) https://doi.org/10.1117/12.2587365

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Surface defects of fused silica glass have become the main reason that limits the resistance of fused silica components to laser damage. When the laser enters the scratch, the scratch modulates the incident light field to increase the local light intensity, increase the probability of damage to the optical element, and reduce the damage threshold. In order to study the modulation effect of scratches on the light field, this paper considers radial triangular scratches and uses the finite difference time domain (FDTD) method to establish a laser incident triangular scratch model. As a result, with the increase of the scratch width w, the maximum light intensity enhancement factor (LIEF) on the front surface of the scratch is 4.6, and the maximum LIEF on the rear surface can reach 9.2. With the increase of the scratch depth d, the LIEF on the front surface of the scratch is 7.5, and the maximum LIEF on the rear surface can reach 12.2. When the scratch is located on the rear surface, the incident laser occurs totally reflection, the interference effect is obvious, the LIEF becomes larger, and the rear surface is more prone to damage.

Proceedings Article | 2 December 2020 Paper

Photo-acoustic detection of laser-induced damage on optical component based on PVDF electrospinning

Sunlin Xiang, Zailin Ke, Baoxing Xiong, Fan Gao, Xiang Zhang, Xiao Yuan

Proceedings Volume 11717, 117172S (2020) https://doi.org/10.1117/12.2587370

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Photo-acoustic detection is carried out on the laser-induced damage of fused silica glass. The Nd: YAG laser with the wavelength of 1064 nm, pulse duration of 10 ns and the maximum output energy of 7.0 J is used in the experimental. Results showed that: photo-acoustic could not be detected when damage has not occurred. Photo-acoustic signals containing high frequency components can be received after damage occurs. Compared with the sensor attached to the end surface and placed in the air, attaching the sensor to the side has the characteristics of high signal-to-noise ratio and does not affect the optical path. Above work provide a new technical idea for the photo-acoustic method in the damage detection.

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