The effect of frequency modulation on the FSR of a Fabry-Perot cavity using an Optical Spectrum Analyser

EPJ Web of Conferences(2022)

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Abstract
It is presented a study of the dependence between the free spectral range (FSR) and the cavity length in Fabry-Perot interferometers. Furthermore, the effect of frequency modulation on the FSR is studied when an optical spectrum analyser (OSA) is used as an interrogator. For low frequency range it is possible to observe this behaviour in the OSA and using an appropriate processing signal it is possible to use the white light interferometry technique.
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