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Proceedings Paper

High reflector absorptance measurements by the surface thermal lensing technique
Author(s): Robert Chow; John R. Taylor; Zhouling Wu; Rene Krupka; Tian Li Yang
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Paper Abstract

Surface thermal lensing is an alternate configuration of a photothermal deflection system that was used to measure low levels of optical absorption. The thermal lensing configuration facilitated the alignment of the pump and prove laser beams by using a larger diameter probe beam. This technique was applied to high performance optical coatings, specifically high reflectors at 511 nm, zero degrees angle of incidence. The absorptance of these coatings was previously measured using a high power copper vapor laser system. A high power copper laser beam is focused onto an approximately 2 mm diameter spot. A thermal camera senses the temperature rise with respect to the rest of the coating. The temperature change, power density and beam diameter were used with an empirical formula that yields optical absorption. The surface thermal lensing technique was able to resolve absorption levels lower than that achieved with the copper laser method.

Paper Details

Date Published: 13 May 1997
PDF: 8 pages
Proc. SPIE 2966, Laser-Induced Damage in Optical Materials: 1996, (13 May 1997); doi: 10.1117/12.274226
Show Author Affiliations
Robert Chow, Lawrence Livermore National Lab. (United States)
John R. Taylor, Lawrence Livermore National Lab. (United States)
Zhouling Wu, Eastern Michigan Univ. (United States)
Rene Krupka, Eastern Michigan Univ. (United States)
Tian Li Yang, Eastern Michigan Univ. (United States)

Published in SPIE Proceedings Vol. 2966:
Laser-Induced Damage in Optical Materials: 1996
Harold E. Bennett; Arthur H. Guenther; Mark R. Kozlowski; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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