4 May 2007 Reduced angle-shift infrared bandpass filter coatings
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Abstract
Infrared optics are often expected to perform over a wide range of angles of incidence, over a selected bandpass. For the best performance, it is often desired that the shift of spectral features, and the splitting between s and p polarizations, be minimized. These issues can be mitigated to a large extent by design, particularly over a narrow range of angles. However, the availability of high index materials throughout a stack design can greatly improve the performance at a given coating thickness, or greatly reduce the overall thickness required to achieve a design. Here we discuss several designs that have been achieved via hydrogenated silicon in multilayers, which demonstrate improved performance at oblique angles of incidence.
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B. M. Lairson, J. Mosier, K. Gibbons, J. H. Sternbergh, M. A. George, "Reduced angle-shift infrared bandpass filter coatings", Proc. SPIE 6545, Window and Dome Technologies and Materials X, 65451C (4 May 2007); doi: 10.1117/12.719347; https://doi.org/10.1117/12.719347
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