Abstract

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 $250\mathrm{mrad}$ rms. Small spectral shifts of the pulses lead to interference behavior that is consistent with $1\mathrm{kHz}$ frequency combs.

© 2005 Optical Society of America

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