15 June 2015 GRIN optics for multispectral infrared imaging
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Graded index (GRIN) optics offer potential for both weight savings and increased performance but have so far been limited to visible and NIR bands (wavelengths shorter than about 0.9 μm). NRL is developing a capability to extend GRIN optics to longer wavelengths in the infrared by exploiting diffused IR transmitting chalcogenide glasses. These IR-GRIN lenses are compatible with all IR wavebands (SWIR, MWIR and LWIR) and can be used alongside conventional wideband materials. Traditional multiband IR imagers require many elements for correction of chromatic aberrations, making them large and heavy and not well-suited for weight sensitive platforms. IR-GRIN optical elements designed with simultaneous optical power and chromatic correction can reduce the number of elements in wideband systems, making multi-band IR imaging practical for platforms including small UAVs and soldier handheld, helmet or weapon mounted cameras. The IR-GRIN lens technology, design space and anti-reflection considerations are presented in this paper.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel Gibson, Daniel Gibson, Shyam Bayya, Shyam Bayya, Vinh Nguyen, Vinh Nguyen, Jas Sanghera, Jas Sanghera, Mikhail Kotov, Mikhail Kotov, Gryphon Drake, Gryphon Drake, "GRIN optics for multispectral infrared imaging", Proc. SPIE 9451, Infrared Technology and Applications XLI, 94511P (15 June 2015); doi: 10.1117/12.2177136; https://doi.org/10.1117/12.2177136


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