Enhanced absorption diagnostic coatings

Robert A. Field

doi:10.1117/12.185785

7 September 1994 Enhanced absorption diagnostic coatings

Robert A. Field

Proceedings Volume 2262, Optical Thin Films IV: New Developments; (1994) https://doi.org/10.1117/12.185785
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

Citation Download Citation

Robert A. Field "Enhanced absorption diagnostic coatings", Proc. SPIE 2262, Optical Thin Films IV: New Developments, (7 September 1994); https://doi.org/10.1117/12.185785

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