Velocity selective optical pumping of Rb hyperfine lines induced by a train of femtosecond pulses.
We present direct observation of the velocity-selective optical pumping of the Rb ground state hyperfine levels induced by 5S(1/2) --> 5P(1/2) femtosecond pulse-train excitation. A modified direct frequency comb spectroscopy based on the fixed frequency comb and a weak cw scanning probe laser was developed. The femtosecond pulse-train excitation of a Doppler-broadened Rb four-level atomic vapor is investigated theoretically in the context of the density matrix formalism and the results are compared with the experiment.
Aumiler
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Institute of Physics, Bijenicka 46, Zagreb, Croatia.
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Skenderović
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Pichler
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