Abstract

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 $\mathrm{MgO}\text{:}{\mathrm{LiNbO}}_3$) placed inside the OPO for phase mismatched second harmonic generation (SHG) of the resonating signal beam. The phase mismatched SHG causes cascading ${\chi }^{(2)}$ nonlinearities, which can substantially increase the effective ${\chi }^{(3)}$ nonlinearity in $\mathrm{MgO}\text{:}{\mathrm{LiNbO}}_3$, leading to spectral broadening of the OPO signal beam via self-phase modulation. The OPO generates a stable 4 THz wide ($-30\mathrm{dB}$) frequency comb centered at 1.56 μm.

© 2013 Optical Society of America

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