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Proceedings Paper

Enhanced absorption diagnostic coatings
Author(s): Robert A. Field
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Paper Abstract

Diagnostic coatings have been designed with predicted absorptances twenty to forty times that of quarter wave stack high reflectance laser coatings even though the film layers have the same very low absorption indices. The diagnostic coatings can precisely reveal the values of the absorption indices of individual thin film materials with metrology of modest accuracy. These designs may enable coating producers to evaluate alternate film materials and changes in deposition processes accurately and rapidly. One diagnostic design distinguishes between bulk film absorption and layer interface absorption. Improved film material properties data will result in better predictions of the performance of new designs and may result in the development of new designs with reduced sensitivity to bulk film or interface absorption. Matrix equations are used to relate coating absorption to film absorption indices for normal incidence quarter wave stack coatings.

Paper Details

Date Published: 7 September 1994
PDF: 13 pages
Proc. SPIE 2262, Optical Thin Films IV: New Developments, (7 September 1994); doi: 10.1117/12.185785
Show Author Affiliations
Robert A. Field, W.J. Schafer Associates, Inc. (United States)

Published in SPIE Proceedings Vol. 2262:
Optical Thin Films IV: New Developments
James D. Rancourt, Editor(s)

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