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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Modulation Instability Induced Frequency Comb Generation in a Continuously Pumped Optical Parametric Oscillator.

S Mosca1, M Parisi1, I Ricciardi1,2

  • 1CNR-INO, Istituto Nazionale di Ottica, Via Campi Flegrei 34, I-80078 Pozzuoli (NA), Italy.

Physical Review Letters
|September 20, 2018
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate novel quadratic combs in optical parametric oscillators (OPOs). This study reveals new dynamics for generating phase-locked frequency combs, potentially enabling access to mid-infrared spectral regions.

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Area of Science:

  • Nonlinear optics
  • Quantum optics

Background:

  • Optical frequency combs are typically generated using third-order nonlinear effects (Kerr nonlinearity).
  • Second-order nonlinear effects offer an alternative pathway for frequency comb generation.

Purpose of the Study:

  • To report the formation of quadratic combs in optical parametric oscillator (OPO) configurations.
  • To explore new dynamical regimes leading to comb formation in continuously pumped OPOs.

Main Methods:

  • Experimental generation of optical frequency combs in a continuously driven OPO.
  • Numerical modeling of OPO dynamics using a time-domain mean-field equation.
  • Analysis of coherence properties of simulated frequency comb spectra.

Main Results:

  • Demonstrated generation of optical frequency combs in the parametric region around half the pump frequency of an OPO.
  • Identified novel dynamical regimes, driven by modulation instabilities, that result in comb formation.
  • Numerical simulations showed good agreement with experimental spectra and revealed correlated, phase-locked combs.

Conclusions:

  • The study reveals previously unnoticed dynamics in OPOs, leading to quadratic comb formation.
  • This work can lead to new types of frequency comb sources.
  • Potential for straightforward access to elusive spectral regions, such as the mid-infrared, for novel applications.