6 May 2009 Filters for dual band infrared imagers
Author Affiliations +
Abstract
Dual band infrared imagers require a similar set of filters as are needed by single band infrared imagers but with the added requirement of high transmission in the mid and far infrared. The design of discrete layer filters with optimized dual band transmission is investigated for three types of filters. These are a visible-infrared beamsplitter, a long wavelength edge filter and a dual bandpass cold filter. These designs illustrate the role that harmonic reflection bands can play in the design of dual band filters. The visible reflection beamsplitter design does not have harmonics in the infrared but requires additional layers to reduce reflection at mid and long wavelengths. The long wavelength edge filter requires suppression of the second and third harmonics while the sensor band pass cold filter can use harmonics to advantage. Design techniques are discussed and the results of an initial set of fabrication runs are presented to assess the sensitivity of example designs to manufacturing errors.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas D. Rahmlow, Jeanne E. Lazo-Wasem, Scott Wilkinson, Flemming Tinker, "Filters for dual band infrared imagers", Proc. SPIE 7298, Infrared Technology and Applications XXXV, 72982J (6 May 2009); doi: 10.1117/12.820059; https://doi.org/10.1117/12.820059
PROCEEDINGS
8 PAGES


SHARE
RELATED CONTENT

Uncooled multispectral detectors
Proceedings of SPIE (October 26 1998)
Cooled field stop using a linear variable filter in a...
Proceedings of SPIE (September 21 1998)
Automated Control Of Optical Layer Fabrication Processes
Proceedings of SPIE (November 28 1983)
Filters for HST Wide Field Camera 3
Proceedings of SPIE (June 15 2006)
Multiband Selection Device
Proceedings of SPIE (August 01 1984)
Sampling And Aliasing Problems With Imaging Arrays
Proceedings of SPIE (May 14 1984)

Back to Top