Phase-locked ultrashort pulse trains at separate and independently tunable wavelengths.
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.
Baum
Peter
P
Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität, Oettingenstrasse 67, 80538 München, Germany. peter.baum@physik.uni-muenchen.de
Riedle
Eberhard
E
Greve
Marco
M
Telle
Harald R
HR