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3 December 1980 Temperature-Invariant And Other Narrow-Band IR Filters Containing PbTe, 4-20μm
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Abstract
PbTe is unique amongst coating materials because of its negative temperature coefficient of refractive index. In combination with a conventional II-VII) material it can confer immunity to temperature variation from at least -23oC to +110oC for a narrowband filter. It also has an absolutely large refractive index so that filters are attainable with minimal degradation when tilted, and a minimum number of layers overall particularly towards 20 µm. Excellent transmission can be obtained.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. S. Seeley, R. Hunneman, and A. Whatley "Temperature-Invariant And Other Narrow-Band IR Filters Containing PbTe, 4-20μm", Proc. SPIE 0246, Contemporary Infrared Sensors and Instruments, (3 December 1980); https://doi.org/10.1117/12.959359
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