The generation and characterization of femtosecond pulses at three independently tunable visible wavelengths is reported. Selected spectral portions of a common continuum generated in sapphire are amplified in noncollinear optical parametric amplifiers. The phase relation of the pulse trains is analyzed with a nonlinear interferometer based on coherent anti-Stokes Raman scattering and is found to be locked to better than 250 mrad rms. Small spectral shifts of the pulses lead to interference behavior that is consistent with 1 kHz frequency combs.
© 2005 Optical Society of America
Peter Baum, Eberhard Riedle, Marco Greve, and Harald R. Telle, "Phase-locked ultrashort pulse trains at separate and independently tunable wavelengths," Opt. Lett. 30, 2028-2030 (2005)