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Proceedings Paper

Growth mechanism of laser-induced damage in fused silica
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Paper Abstract

Growth of laser induced damage on the surface of fused silica plays a major role in determining the optics lifetime in high power laser system. Previous studies proved that the size of the crater increased under successive laser shots, but that of the gray haze and CO2 laser mitigation spot remained constant. In this study, Scanning electron microscopy (SEM), focus ion beam (FIB) and profiler were applied to observe their vertical and horizontal cross sections. Energy dispersive spectrometers (EDS) micro-analysis technique and fluorescent microscopy were used to detect the differences of chemical composition and molecular structure among the three. Results showed that the absorbing defect and crack was found in the crater, which did not exist in the gray haze and mitigation spot. Finite difference time domain (FDTD) was applied to calculate the light intensity distribution. It's found that the peak light intensity around the crater was much higher. Based on the above analysis, a growth mechanism of laser induced damage in fused silica was proposed.

Paper Details

Date Published: 6 December 2011
PDF: 9 pages
Proc. SPIE 8190, Laser-Induced Damage in Optical Materials: 2011, 819020 (6 December 2011); doi: 10.1117/12.899108
Show Author Affiliations
Guohang Hu, Shanghai Institute of Optics and Fine Mechanics (China)
Kui Yi, Shanghai Institute of Optics and Fine Mechanics (China)
Xiaofeng Liu, Shanghai Institute of Optics and Fine Mechanics (China)
Yuanan Zhao, Shanghai Institute of Optics and Fine Mechanics (China)
Jianda Shao, Shanghai Institute of Optics and Fine Mechanics (China)


Published in SPIE Proceedings Vol. 8190:
Laser-Induced Damage in Optical Materials: 2011
Gregory J. Exarhos; Vitaly E. Gruzdev; Joseph A. Menapace; Detlev Ristau; M. J. Soileau, Editor(s)

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