Abstract
We report on the combined action of a cw diode laser and a train of ultrashort pulses when each of them drives one step of the two-photon transition in rubidium vapor. The fluorescence from the state is detected for a fixed repetition rate of the femtosecond laser while the cw-laser frequency is scanned over the rubidium lines. This scheme allows for a velocity selective spectroscopy in a large spectral range including the and states. The results are well described in a simplified frequency domain picture, considering the interaction of each velocity group with the cw laser and a single mode of the frequency comb.
© 2012 Optical Society of America
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