Radiation pressure force on cold rubidium atoms due to excitation to a non-cooling hyperfine level


We study the radiation pressure force exerted on cold 87Rb atoms captured in a magneto-optical trap (MOT) due to resonant excitation of atoms into the non-cooling 5P1 / 2(F e = 2) hyperfine level. We measure the fractional excited population for different MOT parameters such as cooling laser detuning and power, and empirically test the applicability of the Optical Bloch Equations for describing cold atoms in the MOT. We use the effective saturation intensity parameter which enables simple calculation of the fractional excited state population in a multi-level system using a two-level model, and apply it for the radiative force modeling. This approach provides a valuable tool for optical manipulation experiments.

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Kregar, G., Šantić, N., Aumiler, D. et al. Radiation pressure force on cold rubidium atoms due to excitation to a non-cooling hyperfine level. Eur. Phys. J. D 68, 360 (2014). https://doi.org/10.1140/epjd/e2014-50312-3

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