Infrared (IR) transmitting gradient index (GRIN) materials have been developed for broad-band IR imaging. This material is derived from the diffusion of homogeneous chalcogenide glasses has good transmission for all IR wavebands. The optical properties of the IR-GRIN materials are presented and the fabrication and design methodologies are discussed. Modeling and optimization of the diffusion process is exploited to minimize the deviation of the index profile from the design profile. Fully diffused IR-GRIN blanks with Δn of ~0.2 are demonstrated with deviation errors of ±0.01 refractive index units.
Daniel Gibson, Shyam Bayya, Vinh Nguyen, Jas Sanghera, Mikhail Kotov, Collin McClain, John Deegan, George Lindberg, Blair Unger, and Jay Vizgaitis, "IR GRIN optics: design and fabrication," Proc. SPIE 10181, Advanced Optics for Defense Applications: UV through LWIR II, 101810B (Presented at SPIE Defense + Security: April 09, 2017; Published: 1 June 2017); https://doi.org/10.1117/12.2262706.
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