The Fabry-Perot interferometer is commonly used as a narrow-bandpass filter or as an instrument to measure spectral linewidths.
Fabry-Perot interferometer (etalon)
Fabry-Perot interferometers that cannot be scanned are called etalons.
Schematic of a Fabry-Perot etalon
Transmission through a Fabry-Perot interferometer as a function of wavelength
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Copyright © 1996 by Brian M. Tissue