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Proceedings Paper

Characterization of laser damage performance of fused silica using photothermal absorption technique
Author(s): Wen Wan; Feng Shi; Yifan Dai; Xiaoqiang Peng
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Paper Abstract

The subsurface damage and metal impurities have been the main laser damage precursors of fused silica while subjected to high power laser irradiation. Light field enhancement and thermal absorption were used to explain the appearance of damage pits while the laser energy is far smaller than the energy that can reach the intrinsic threshold of fused silica. For fused silica optics manufactured by magnetorheological finishing or advanced mitigation process, no scratch-related damage site occurs can be found on the surface.

In this work, we implemented a photothermal absorption technique based on thermal lens method to characterize the subsurface defects of fused silica optics. The pump beam is CW 532 nm wavelength laser. The probe beam is a He-Ne laser. They are collinear and focused through the same objective. When pump beam pass through the sample, optical absorption induces the local temperature rise. The lowest absorptance that we can detect is about the order of magnitude of 0.01 ppm. When pump beam pass through the sample, optical absorption induces the local temperature rise.

The photothermal absorption value of fused silica samples range from 0.5 to 10 ppm. The damage densities of the samples were plotted. The damage threshold of samples at 8J/cm2 were gived to show laser damage performance of fused silica.The results show that there is a strong correlation between the thermal absorption and laser damage density. The photothermal absorption technique can be used to predict and evaluate the laser damage performance of fused silica optics.

Paper Details

Date Published: 26 June 2017
PDF: 7 pages
Proc. SPIE 10329, Optical Measurement Systems for Industrial Inspection X, 103294S (26 June 2017); doi: 10.1117/12.2270192
Show Author Affiliations
Wen Wan, National Univ. of Defense Technology (China)
Hunan Key Lab. of Ultra-Precision Machining Technology (China)
Feng Shi, National Univ. of Defense Technology (China)
Hunan Key Lab. of Ultra-Precision Machining Technology (China)
Yifan Dai, National Univ. of Defense Technology (China)
Hunan Key Lab. of Ultra-Precision Machining Technology (China)
Xiaoqiang Peng, National Univ. of Defense Technology (China)
Hunan Key Lab. of Ultra-Precision Machining Technology (China)


Published in SPIE Proceedings Vol. 10329:
Optical Measurement Systems for Industrial Inspection X
Peter Lehmann; Wolfgang Osten; Armando Albertazzi Gonçalves, Editor(s)

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