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Proceedings Paper

Photothermal tomography of optical coatings based on surface thermal lensing technology
Author(s): Junhai Xu; Meiping Zhu; Yuanan Zhao; Kui Yi; Jianda Shao
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Paper Abstract

Surface thermal lensing (STL) technology was developed into an effective apparatus for the measurement and analysis of weak-absorption optical coatings. Previous work focused on the measurement of the whole sample and was based on the assumption that the film is very thin. In this paper, by changing the modulated frequency of the pump laser from 1 Hz to 101 kHz, we accurately controlled the thermal diffusion length and got both the amplitude and phase of the photothermal signal of different samples. Based on the comparison of these signals, some analysis of 1) the thermal conductivity measurement and 2) the depth localization of strongly absorbing layer was performed.

Paper Details

Date Published: 22 November 2011
PDF: 11 pages
Proc. SPIE 8190, Laser-Induced Damage in Optical Materials: 2011, 819010 (22 November 2011); doi: 10.1117/12.899045
Show Author Affiliations
Junhai Xu, Shanghai Institute of Optics and Fine Mechanics (China)
Meiping Zhu, Shanghai Institute of Optics and Fine Mechanics (China)
Yuanan Zhao, Shanghai Institute of Optics and Fine Mechanics (China)
Kui Yi, 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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