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Optical Engineering

Effects of laser plasma on damage in optical glass induced by pulsed lasers
Author(s): Jinghua Han; Qiuhui Zhang; Ruihua Niu; Guoying Feng; Yaguo Li; LiMing Yang; Changtao He
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Paper Abstract

Laser-induced plasma can expedite the deposition of incident laser energy and the laser-induced damage in optical glass is considerably affected by the magnitude and distribution of the plasma shock wave. The spatial distribution of energy deposition and expansion pressure of the laser plasma shock wave is analyzed based on the moving breakdown model. Furthermore, damage morphologies are discussed in light of the spatial distribution of pressure and glass properties. It was found that with the increase of laser pulse energy, the shock wave expands rapidly in the direction opposite to the incident laser, resulting in that the damage morphologies transform from sphere to spindle gradually. The laser energy deposits mostly in a narrow plasma channel. The diffusion of the plasma with high temperature and pressure leads to the shock wave; the intensity of which decreases sharply with the axial distance from the centerline. As a consequence, the glass near the centerline fractures and melts, and the refractive index also changes near the end of cracks.

Paper Details

Date Published: 19 July 2012
PDF: 9 pages
Opt. Eng. 51(12) 121809 doi: 10.1117/1.OE.51.12.121809
Published in: Optical Engineering Volume 51, Issue 12
Show Author Affiliations
Jinghua Han, Sichuan Univ. (China)
Qiuhui Zhang, Sichuan Univ. (China)
Ruihua Niu, Sichuan Univ. (China)
Guoying Feng, Sichuan Univ. (China)
Yaguo Li, Chengdu Fine Optical Engineering Research Ctr. (Japan)
LiMing Yang, Chengdu Fine Optical Engineering Research Ctr. (China)
Changtao He, Univ. of Electronic Science and Technology of China (China)

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