High-resolution spectroscopy with a femtosecond laser frequency comb.
The output of a mode-locked femtosecond laser is used for precision single-photon spectroscopy of 133Cs in an atomic beam. By changing the laser's repetition rate, the cesium D1 (6s 2S(1/2)-->6p 2P(1/2)) and D2 (6s 2S(1/2)-->6p 2P(3/2)) transitions are detected and the optical frequencies are measured with accuracy similar to that obtained with a cw laser. Control of the femtosecond laser repetition rate by use of the atomic fluorescence is also implemented, thus realizing a simple cesium optical clock.
Gerginov
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Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556-5670, USA. vgergino@nd.edu
Tanner
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Diddams
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Bartels
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Hollberg
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