8 October 1998 Characterization of narrowband infrared interference filters
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Abstract
A Fourier-transform infrared (FT-IR) spectrophotometer system is used to measure the transmittance of infrared band-pass filters as a function of wavelength, temperature, and beam geometry. Measurements are performed using an f/4 beam geometry at normal incidence, or a nearly collimated geometry with variable angle of incidence. Blocking filters are used to expand the dynamic range of the out-of-band measurement to transmittances as low as 10-6 with 4 cm-1 resolution.
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Simon G. Kaplan, Leonard M. Hanssen, "Characterization of narrowband infrared interference filters", Proc. SPIE 3425, Optical Diagnostic Methods for Inorganic Transmissive Materials, (8 October 1998); doi: 10.1117/12.326678; https://doi.org/10.1117/12.326678
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