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Proceedings Paper

Environmental stability of rugate filters: in-situ measurements of their spectral properties
Author(s): Walter E. Johnson; Byron P. Edmonds; Marsha J. Wolf
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Paper Abstract

Historically, the optical coating community has greatly improved the environmental stability of single and multilayer coatings through the incorporation of energetic processes into the deposition chamber. Typically three different methods are used to impart additional kinetic energy: (1) to the evaporant at the source, (2) to the evaporant while in route between the source and substrate, or (3) to the condensate at the substrate. One of the benefits of these energetic processes is the reduction of the spectral shift of the filter with changes in relative humidity. Typical spectral shifts can range from tens of nanometers with nonenergetic processes to less than tenths of a nanometer with energetic processes. This paper contrasts in-situ measured spectral shifts over the visible wavelength region of single narrow reflection band rugate coatings placed in an environmental chamber. Measurements were taken at room temperature while incrementally increasing the relative humidity from less than 2 to 90%. The measured rugate coatings were fabricated by three different processes: physical vapor deposition, ion-assisted physical vapor deposition, and sputtering. The spectral shift of the reflection band for the physical vapor deposition coating was 24.7 nanometers, as measured at the full-width-at-half maximum, and for the two more energetic process coatings less than 2.6 Angstroms, the resolution of our measurement.

Paper Details

Date Published: 8 October 1998
PDF: 7 pages
Proc. SPIE 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials, (8 October 1998); doi: 10.1117/12.326682
Show Author Affiliations
Walter E. Johnson, Air Force Research Lab. (United States)
Byron P. Edmonds, Air Force Research Lab. (United States)
Marsha J. Wolf, Science Applications International Corp. (United States)

Published in SPIE Proceedings Vol. 3425:
Optical Diagnostic Methods for Inorganic Transmissive Materials
Raju V. Datla; Leonard M. Hanssen, Editor(s)

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