Abstract.
We present direct observation of the velocity-selective optical pumping of the Cs ground state hyperfine levels induced by the femtosecond (fs) laser oscillator centered at either D2 (6 2S1/2↦6 2P3/2, 852 nm) or D1 (6 \(^{2}{\rm S}_{1/2}\to6~^{2}\)P1/2, 894 nm) cesium line. We utilized previously developed modified direct frequency comb spectroscopy (DFCS) which uses a fixed frequency comb for the excitation and a weak cw scanning probe laser centered at the 133Cs 6 2S1/2↦6 2P3/2 transition (D2 line) for ground levels population monitoring. The frequency comb excitation changes the usual Doppler absorption profile into a specific periodic, comblike structure. The mechanism of the velocity selective population transfer between the Cs ground state hyperfine levels induced by fs pulse train excitation is verified in a theoretical treatment of the multilevel atomic system subjected to a pulse train resonant field interaction.
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Vujičić, N., Vdović, S., Aumiler, D. et al. Femtosecond laser pulse train effect on Doppler profile of cesium resonance lines. Eur. Phys. J. D 41, 447–454 (2007). https://doi.org/10.1140/epjd/e2006-00261-5
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DOI: https://doi.org/10.1140/epjd/e2006-00261-5