High resolution spectroscopy with a femtosecond laser frequency comb

The output of a mode-locked femtosecond-laser is used for high resolution spectroscopy of Cs in an atomic beam. The laser is referenced directly to a stable RF signal from the NIST time-scale. By changing the laser's repetition rate, the Cs D/sub 1/ and D/sub 2/ transitions are detected with high resolution.

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