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Optica Publishing Group
  • 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 2019),
  • paper ed_p_22

Optical frequency comb generation induced by gain-through-losses modulation instability in passive optical cavities

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Abstract

Optical frequency combs consist in a set of equally spaced mutually coherent laser frequency lines with a wealth of applications in the most diverse fields of photonics technology including metrology, astrophysics and molecular spectroscopy. Mode-locked lasers and passive driven resonators are the most relevant platforms for their generation. In Kerr resonators, in general frequency combs are generated through four wave mixing triggered by modulation instability (MI) in the anomalous dispersion regime [1]. In this case however the comb repetition rate is not tuneable but it is simply determined by the cavity free spectral range. We present here experimental results about a new method for frequency combs, with tuneable repetition rate, generation in normal dispersion externally driven passive optical resonators with Kerr (cubic) nonlinearity. We exploit the gain-through-losses (GTL) process to excite a modulation instability (MI) which initiates the comb formation. GTL enables energy transfer from a powerful pump field to sidebands frequencies thanks to frequency asymmetric spectral losses for signal and idler waves. The lossy modes themselves are counterintuitively amplified in virtue of the losses presence [2].

© 2019 IEEE

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