Filters for dual band infrared imagers

Thomas D. Rahmlow Jr.; Jeanne E. Lazo-Wasem; Scott Wilkinson; Flemming Tinker

doi:10.1117/12.820059

6 May 2009 Filters for dual band infrared imagers

Thomas D. Rahmlow Jr., Jeanne E. Lazo-Wasem, Scott Wilkinson, Flemming Tinker

Proceedings Volume 7298, Infrared Technology and Applications XXXV; 72982J (2009) https://doi.org/10.1117/12.820059
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

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.

Citation Download Citation

Thomas D. Rahmlow Jr., Jeanne E. Lazo-Wasem, Scott Wilkinson, and Flemming Tinker "Filters for dual band infrared imagers", Proc. SPIE 7298, Infrared Technology and Applications XXXV, 72982J (6 May 2009); https://doi.org/10.1117/12.820059

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