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Proceedings Paper

Finite element thermal analysis of multispectral coatings for the ABL
Author(s): Rashmi S. Shah; Jerry Ray Bettis; Alan F. Stewart; Lynn Bonsall; James Copland; William Hughes; Juan Carlos Echeverry
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Paper Abstract

The thermal response of a coated optical surface is an important consideration in the design of any high average power system. Finite element temperature distribution were calculated for both coating witness samples and calorimetry wafers and were compared to actual measured data under tightly controlled conditions. Coatings for ABL were deposited on various substrates including fused silica, ULE, Zerodur, and silicon. The witness samples were irradiate data high power levels at 1.315micrometers to evaluate laser damage thresholds and study absorption levels. Excellent agreement was obtained between temperature predictions and measured thermal response curves. When measured absorption values were not available, the code was used to predict coating absorption based on the measured temperature rise on the back surface. Using the finite element model, the damaging temperature rise can be predicted for a coating with known absorption based on run time, flux, and substrate material.

Paper Details

Date Published: 7 April 1999
PDF: 15 pages
Proc. SPIE 3578, Laser-Induced Damage in Optical Materials: 1998, (7 April 1999); doi: 10.1117/12.344391
Show Author Affiliations
Rashmi S. Shah, The Boeing Co. (United States)
Jerry Ray Bettis, The Boeing Co. (United States)
Alan F. Stewart, The Boeing Co. (United States)
Lynn Bonsall, The Boeing Co. (United States)
James Copland, Logicon Technical Services, Inc. (United States)
William Hughes, Lockheed Martin Missiles & Space (United States)
Juan Carlos Echeverry, SMC/TMAC (United States)

Published in SPIE Proceedings Vol. 3578:
Laser-Induced Damage in Optical Materials: 1998
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; Keith L. Lewis; M. J. Soileau, Editor(s)

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