Frequency comb generation by a continuous-wave-pumped optical parametric oscillator based on cascading quadratic nonlinearities

Ville Ulvila, Christopher R. Phillips, Lauri Halonen, Markku Vainio (Corresponding Author)

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We report optical frequency comb generation by a continuous-wave pumped optical parametric oscillator (OPO) without any active modulation. The OPO is configured as singly resonant with an additional nonlinear crystal (periodically poled MgO:LiNbO3) placed inside the OPO for phase mismatched second harmonic generation (SHG) of the resonating signal beam. The phase mismatched SHG causes cascading Χ(2) nonlinearities, which can substantially increase the effective Χ(3) nonlinearity in MgO:LiNbO3, leading to spectral broadening of the OPO signal beam via self-phase modulation. The OPO generates a stable 4 THz wide (−30  dB) frequency comb centered at 1.56 μm.
Original languageEnglish
Pages (from-to)4281-4284
JournalOptics Letters
Issue number21
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed



  • parametric oscillators
  • self-action effects
  • nonlinear optics
  • nonlinear wave mixing

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