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Proceedings Paper

Laser-induced surface thermal lensing for thin film characterizations
Author(s): Zhouling Wu; Pao-Kuang Kuo; Y. S. Lu; S. T. Gu
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Paper Abstract

Laser-induced surface deformation is a widely used technique for studying thin film coatings. In this technique the deformation is typically detected by using the well-known optical beam deflection technique. In this paper we report a different technique in studying the deformation by using optical diffraction effect. In this detection scheme the laser-induced thermal bump behaves as a curved reflection mirror which can either focus or defocus a second probe laser beam through optical diffraction, depending on the specific geometry used. This surface thermal lensing effect is demonstrated to be a sensitive and easy-to-handle method for thin film characterization. The potentials of this technique and its advantages over the conventional method for thin film absorption measurement and defect characterization are discussed.

Paper Details

Date Published: 27 May 1996
PDF: 11 pages
Proc. SPIE 2714, 27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995, (27 May 1996); doi: 10.1117/12.240357
Show Author Affiliations
Zhouling Wu, Eastern Michigan Univ. (United States)
Pao-Kuang Kuo, Wayne State Univ. (United States)
Y. S. Lu, Wayne State Univ. (United States)
S. T. Gu, Eastern Michigan Univ. (United States)

Published in SPIE Proceedings Vol. 2714:
27th Annual Boulder Damage Symposium: Laser-Induced Damage in Optical Materials: 1995
Harold E. Bennett; Arthur H. Guenther; Mark R. Kozlowski; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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