A femtosecond optical parametric oscillator is demonstrated that can operate in a regime where two signal pulses with well-separated center wavelengths are simultaneously resonant. Measurements show that the oscillator output contains a stable modulation at a frequency corresponding to the difference in the carrier-envelope phase-slip frequencies of the co-resonant pulses. The physical origin of this internal beat signal is attributed to second-order mixing effects, and its frequency is shown to be consistent with theory.
© 2006 Optical Society of America
Original Manuscript: December 16, 2005
Revised Manuscript: February 28, 2006
Manuscript Accepted: April 12, 2006
Jinghua Sun, Barry J. S. Gale, and Derryck T. Reid, "Dual-color operation of a femtosecond optical parametric oscillator exhibiting stable relative carrier-envelope phase-slip frequencies," Opt. Lett. 31, 2021-2023 (2006)