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The precise infrared refractive index for polycrystal and single crystal germanium was measured using the prism minimum deviation method. Samples were obtained from three major suppliers. Values for single and poly are compared. Variation among suppliers is discussed.
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Albert Ray Hilton Sr., "Infrared refractive-index measurement results for single-crystal and polycrystal germanium," Proc. SPIE 1498, Tactical Infrared Systems, (1 October 1991); https://doi.org/10.1117/12.46810