Direct frequency comb measurements of absolute optical frequencies and population transfer dynamics
Abstract
A phase-stabilized femtosecond laser comb is directly used for high-resolution spectroscopy and absolute optical frequency measurements of one- and two-photon transitions in laser-cooled atoms. Absolute atomic transition frequencies, such as the 5S1/2 F=2 7S1/2 F"=2 two-photon resonance measured at 788 794 768 921(44) kHz, are determined without a priori knowledge about their values. Detailed dynamics of population transfer driven by a sequence of pulses are uncovered and taken into account for the measurement of the 5P states via resonantly enhanced two-photon transitions.
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