Time-dependent radiative transfer in magneto-optical traps
Authors: Bezuglov N.N., Molisch A.F., Fioretti A., Gabbanini C., Fuso, F., Allegrini M.
Autors Affiliation: St Petersburg State Univ, VA Fock Inst Phys, St Petersburg 198904, Russia; Lund Tech Univ, Dept Electrosci, Lund, Sweden; CNR, Ist Proc. Chimico Fisici, I-56124 Pisa, Italy; Univ Pisa, INFM, Dipartimento Fis Enrico Fermi, I-56127 Pisa, Italy
Abstract: We investigate radiation-imprisonment (RI) phenomena in a system of cold atoms trapped in magneto-optical traps (MOTs) when cooling lasers are switched off for a short period. The problem is formulated within the framework of the Streater-Cooper-Sandle equation that belongs to the Markov class and accounts for photon frequency redistribution in multiple scattering processes. On the basis of a semiclassical approach, we derive explicit analytical solutions for the spectral problem of the RI equation neglecting Doppler effects. The analysis reveals peculiarities in emission profiles under initial partial saturation of the resonance transition by the probe laser pulse. Comparison between theoretical and experimental data on effective radiative lifetimes obtained in Cs and Rb MOTs confirms the validity of the discussed nonstationary model of RI in cold samples. For small detunings, the Streater-Cooper-Sandle equation agrees with the experimental data, while in the case of large detunings, the theory does not agree, probably due to non-Markovian effects.
Journal/Review: PHYSICAL REVIEW A
Volume: 68 (6) Pages from: 063415 to: 063415
KeyWords: NEUTRAL ATOMS; TRANSPORT; EQUATIONS; BEHAVIORDOI: 10.1103/PhysRevA.68.063415Citations: 5data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-12-05References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here