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New multiband IR imaging optics
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Paper Abstract

We report new multispectral materials that transmit from 0.9 to < 12 µm in wavelength. These materials fill up the glass map for multispectral optics and vary in refractive index from 2.38 to 3.17. They show a large spread in dispersion (Abbe number) and offer some unique solutions for multispectral optics designs. One of the glasses developed is a very good candidate to replace Ge, as it has a combination of excellent properties, including high Abbe number in the LWIR, high index of 3.2, 60% lower dn/dT, and better thermal stability at working temperatures. Our results also provide a wider selection of optical materials to enable simpler achromat designs. For example, we have developed other glasses that have relatively high Abbe number in both the MWIR and LWIR regions, while our MILTRAN ceramic has low Abbe number in both regions. This makes for a very good combination of glasses and MILTRAN ceramic (analogous to crown and flint glasses in the visible) for MWIR + LWIR dual band imaging. We have designed preliminary optics for one such imager with f/2.5, 51 mm focal length and 22 degrees FOV using a spaced doublet of NRL's glass and MILTRAN ceramic. NRL's approach reduces the number of elements, weight, complexity and cost compared with the approach using traditional optics. Another important advantage of using NRL glasses in optics design is their negative or very low positive dn/dT, that makes it easier to athermalize the optical system.

Paper Details

Date Published: 18 June 2013
PDF: 6 pages
Proc. SPIE 8704, Infrared Technology and Applications XXXIX, 870428 (18 June 2013); doi: 10.1117/12.2016332
Show Author Affiliations
Shyam Bayya, U.S. Naval Research Lab. (United States)
Jasbinder Sanghera, U.S. Naval Research Lab. (United States)
Woohong Kim, U.S. Naval Research Lab. (United States)
Daniel Gibson, U.S. Naval Research Lab. (United States)
Erin Fleet, U.S. Naval Research Lab. (United States)
Brandon Shaw, U.S. Naval Research Lab. (United States)
Michael Hunt, Univ. Research Foundation (United States)
Ishwar Aggarwal, Sotera Defense Solutions (United States)

Published in SPIE Proceedings Vol. 8704:
Infrared Technology and Applications XXXIX
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; Paul R. Norton; Patrick Robert, Editor(s)

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