Environmental stability of rugate filters: in-situ measurements of their spectral properties

Walter E. Johnson; Byron P. Edmonds; Marsha J. Wolf

doi:10.1117/12.326682

8 October 1998 Environmental stability of rugate filters: in-situ measurements of their spectral properties

Walter E. Johnson, Byron P. Edmonds, Marsha J. Wolf

Proceedings Volume 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials; (1998) https://doi.org/10.1117/12.326682
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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.

Citation Download Citation

Walter E. Johnson, Byron P. Edmonds, and Marsha J. Wolf "Environmental stability of rugate filters: in-situ measurements of their spectral properties", Proc. SPIE 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials, (8 October 1998); https://doi.org/10.1117/12.326682

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available