Optical frequency combs in quadratically nonlinear resonators

Iolanda Ricciardi, Simona Mosca, Maria Parisi, François Leo, Tobias Hansson, Miro Erkintalo, Pasquale Maddaloni, Paolo De Natale, Stefan Wabnitz, Maurizio De Rosa

Research output: Contribution to journalReview articlepeer-review

14 Citations (Scopus)

Abstract

Optical frequency combs are one of the most remarkable inventions in recent decades. Originally conceived as the spectral counterpart of the train of short pulses emitted by mode-locked lasers, frequency combs have also been subsequently generated in continuously pumped microresonators, through third-order parametric processes. Quite recently, direct generation of optical frequency combs has been demonstrated in continuous-wave laser-pumped optical resonators with a second-order nonlinear medium inside. Here, we present a concise introduction to such quadratic combs and the physical mechanism that underlies their formation. We mainly review our recent experimental and theoretical work on formation and dynamics of quadratic frequency combs. We experimentally demonstrated comb generation in two configurations: a cavity for second harmonic generation, where combs are generated both around the pump frequency and its second harmonic and a degenerate optical parametric oscillator, where combs are generated around the pump frequency and its subharmonic. The experiments have been supported by a thorough theoretical analysis, aimed at modelling the dynamics of quadratic combs, both in frequency and time domains, providing useful insights into the physics of this new class of optical frequency comb synthesizers. Quadratic combs establish a new class of efficient frequency comb synthesizers, with unique features, which could enable straightforward access to new spectral regions and stimulate novel applications.

Original languageEnglish
Article number230
Pages (from-to)1-22
Number of pages22
JournalMicromachines
Volume11
Issue number2
DOIs
Publication statusPublished - 24 Feb 2020

Keywords

  • Modulation instability
  • Optical frequency combs
  • Optical parametric oscillator
  • Quadratic nonlinearity
  • Second harmonic generation
  • NOBEL LECTURE
  • LASER
  • POWER
  • PHASE
  • SOLITONS
  • MODULATION INSTABILITY
  • SPECTROSCOPY
  • optical parametric oscillator
  • second harmonic generation
  • PARAMETRIC OSCILLATION
  • optical frequency combs
  • modulation instability
  • 2ND-HARMONIC GENERATION
  • quadratic nonlinearity
  • MICRORESONATORS

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