Today it is possible to dispose from a large set of laser sources with broad spectra. Among these light sources, we list supercontinuum sources, generated by combination of several nonlinear phenomena [1], frequency combs generated either by using micro-resonators via optical Kerr effect [2] or Raman combs, generated via Stimulated Raman Scattering (SRS) in gas-filled Hollow-Core Photonic Crystal Fibers (HC-PCF) [3]. Some of these sources can generate spectra with a bandwidth that can span over several octaves, as demonstrated with the near-to 6 octaves Raman comb reported in [3].

© 2019 IEEE

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