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Proceedings Paper

High-performance MWIR dual bandpass filter for thermal imaging
Author(s): Karen D. Hendrix; Adam Bergeron; David L. Favot
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Paper Abstract

Bandpass filters transmitting the 3.5 to 5.0μm atmospheric window while simultaneously blocking the 4.3μm CO2 absorption band are in demand. However, realization of these dual bandpass filters is challenging from the standpoint of coating design, material selection, and manufacturing process. JDSU's Ucp-1 magnetron sputtering platform is ideally suited to the production of these types of filters. It enables the use of coating materials with higher transmission and lower temperature shifts than conventional (i.e. thermally evaporated) MWIR materials. Ucp-1 also has excellent layer thickness control, which allows complex designs to be realized. The performance of a dual bandpass filter manufactured for AFRL as part of their "Exploration of Novel Band-pass Filter Designs" program is discussed. The filter achieved average transmission in the passbands of greater than 94% with filter slopes of 1.1% or less. Blocking of the CO2 band was less than 1%, and the below and above band blocking was less than 0.1%. All of the filter requirements were met over the temperature range of 77K to room ambient. We also discuss the results achieved in extending the above approach to the design and manufacture of a quadruple bandpass filter (with passbands centered at 1.23, 1.6, 2.2, and 3.75μm).

Paper Details

Date Published: 6 May 2009
PDF: 12 pages
Proc. SPIE 7298, Infrared Technology and Applications XXXV, 72982K (6 May 2009); doi: 10.1117/12.819944
Show Author Affiliations
Karen D. Hendrix, JDSU (United States)
Adam Bergeron, JDSU (United States)
David L. Favot, JDSU (United States)

Published in SPIE Proceedings Vol. 7298:
Infrared Technology and Applications XXXV
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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