Temperature-Invariant And Other Narrow-Band IR Filters Containing PbTe, 4-20um

J. S. Seeley; R. Hunneman; A. Whatley

doi:10.1117/12.959359

3 December 1980 Temperature-Invariant And Other Narrow-Band IR Filters Containing PbTe, 4-20μm

J. S. Seeley, R. Hunneman, A. Whatley

Proceedings Volume 0246, Contemporary Infrared Sensors and Instruments; (1980) https://doi.org/10.1117/12.959359
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

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 -23^oC to +110^oC 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.

Citation Download Citation

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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