25 October 2013 Design, fabrication, and applications of ultra-narrow infrared bandpass interference filters
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Abstract
We present progress on bandpass infrared interference filters with very narrow passbands to be used for sensitive trace gas and volatile compound imaging and detection and are suitable for mode selection and tuning in singlemode External Cavity Quantum Cascade Lasers. The process parameters for fabrication of such filters with central wavelengths in the 3-12 μm range are described. One representative fillter has a passband width of 6 nm or 0.14% with peak transmission of 62% and a central wavelength of 4.4μm. Theoretically, it can be tuned through about 4% by tilting with respect to the incident beam and offers orders of magnitude larger angular dispersion than diffraction gratings. We compare filters with single-cavity and coupled-cavity Fabry-Perot designs. The filters pass the tests for adhesion and abrasion as stated in MIL-C-48497.
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Jan Kischkat, Sven Peters, Mykhaylo P. Semtsiv, Tristan Wegner, Mikaela Elagin, Grygorii Monastyrskyi, Yuri Flores, Sergii Kurlov, W. Ted Masselink, "Design, fabrication, and applications of ultra-narrow infrared bandpass interference filters", Proc. SPIE 8896, Electro-Optical and Infrared Systems: Technology and Applications X, 889614 (25 October 2013); doi: 10.1117/12.2029336; https://doi.org/10.1117/12.2029336
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