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Proceedings Paper

Absorptance measurements of transmissive optical components by the surface thermal lensing technique
Author(s): Robert Chow; John R. Taylor; Zhouling Wu; Yue Han; Tian Li Yang
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Paper Abstract

The surface thermal lensing technique (STL) successfully resolved and measured the absorptance of transmissive optical components: near-normal angle-of-incidence anti-reflectors and beam splitters. The STL system uses an Ar ion laser to pump the components at 514.5 nm. The absorptance-induced surface deformation diffracts the HeNe probe beam into a photo- detector. The signal intensity was calibrated with a sample of known absorptance. The optical components were designed to function in a copper vapor laser (CVL) transport system, and were previously tested for absorptance with a high power CVL system at 511 nm. To assure proper absorptance data from the STL system, the pump laser power densities were set at the operational level of the coatings, absorptance time trends were monitored, and absorptance area scans were made. Both types of transmissive optics are more stable than the CVL high reflectors that were measured in another study. Parameter studies based on Fresnel diffraction theory were also performed to optimize experimental condition. The STL system was assessed to have 10 ppb sensitivity for absorption measurement given 2 W of pump power.

Paper Details

Date Published: 20 April 1998
PDF: 10 pages
Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); doi: 10.1117/12.306992
Show Author Affiliations
Robert Chow, Lawrence Livermore National Lab. (United States)
John R. Taylor, Lawrence Livermore National Lab. (United States)
Zhouling Wu, Lawrence Livermore National Lab. (United States)
Yue Han, Eastern Michigan Univ. (United States)
Tian Li Yang, Eastern Michigan Univ. (United States)

Published in SPIE Proceedings Vol. 3244:
Laser-Induced Damage in Optical Materials: 1997
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; M. J. Soileau, Editor(s)

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