1 April 1984 Dual Tunable Fabry-Perot Spectrally Agile Filter
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Two unconventional Fabry-Perot interferometer cavities are used in series to permit transmission of both wide and narrow spectral bands in the infrared. The use of two cavities, in series, blocks unwanted harmonics and effectively extends the free spectral range of the device. The regime of operation covers the middle- and far-infrared spectra, as well as portions of the near- and extreme-infrared. Very small cavity spacings are used to produce a very wide-band transmission window when the device is operated in the zero-order mode. Tuning the device with a closed-loop capacitive control system produces vari-able cavity spacings in higher-order modes, resulting in variable transmission bandwidths over a large spectral range. The design and fabrication issues for two-cavity Fabry-Perot interferometers are discussed, and theoretical perfor-mance and test results are presented for two infrared devices.
Anil K. Jain, David E. Stoltzmann, Gary R. Knowles, Justin G. Droessler, Dean Johnson, "Dual Tunable Fabry-Perot Spectrally Agile Filter," Optical Engineering 23(2), 232159 (1 April 1984). https://doi.org/10.1117/12.7973406 . Submission:

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