We report a degenerate femtosecond optical parametric oscillator (OPO) that is synchronously pumped by a mode-locked Ti:sapphire laser at 1 GHz repetition rate. The OPO produces an 85 nm (10 THz) wide frequency comb centered at 1.6 µm. Stable long-term operation with >100 mW of average output power has been achieved.
Vainio, M., Merimaa, M., Halonen, L., & Vodopyanov, K. (2012). Degenerate 1 GHz repetition rate femtosecond optical parametric oscillator. Optics Letters, 37(21), 4561-4563. https://doi.org/10.1364/OL.37.004561