EPJ Web of Conferences (Jan 2022)

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

  • Reis João,
  • V.Rodrigues António,
  • Robalinho Paulo,
  • Novais Susana,
  • Maia João,
  • Marques Paulo,
  • Roma D.,
  • Salvans J.,
  • Canal M.,
  • Ramos J.,
  • Gualani V.,
  • Sisteré S.,
  • Martín V.,
  • Nofrarias M.,
  • Silva Susana,
  • Frazão Orlando

DOI
https://doi.org/10.1051/epjconf/202226613027
Journal volume & issue
Vol. 266
p. 13027

Abstract

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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.