Abstract

The output of a mode-locked femtosecond laser is used for precision single-photon spectroscopy of ${}^{133}\mathrm{Cs}$ in an atomic beam. By changing the laser’s repetition rate, the cesium $D_1(6s{}^{2}S_{1∕2}\to 6p{}^{2}P_{1∕2})$ and $D_2(6s{}^{2}S_{1∕2}\to 6p{}^{2}P_{3∕2})$ 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.

© 2005 Optical Society of America

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