Time-dependent radiative transfer in magneto-optical traps

Journal Article · Mon Dec 01 04:00:00 EST 2003 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.68.063415· OSTI ID:20640510

Bezuglov, N N ^[1]; Molisch, A F ^[2]; Fioretti, A ^[3]; Gabbanini, C ^[3]; Fuso, F; Allegrini, M ^[4]

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1. V.A. Fock Institute of Physics, St. Petersburg University, Ulianovskaya 1, 198904 St. Petersburg (Russian Federation)
2. Department of Electroscience, Lund Technical University, Ole Romer Waeg 3, Lund (Sweden)
3. Istituto per i Processi Chimico-Fisici del CNR, Via Moruzzi, I-56124 Pisa (Italy)
4. INFM, Dipartimento di Fisica Enrico Fermi, Universita di Pisa, Via F. Buonarroti 2, I-56127 Pisa (Italy)

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.

• OSTI ID: 20640510
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 68; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANALYTICAL SOLUTION
ATOMS
CESIUM
COMPARATIVE EVALUATIONS
COOLING
EMISSION
LASER RADIATION
LASERS
LIFETIME
MAGNETO-OPTICAL EFFECTS
MARKOV PROCESS
MULTIPLE SCATTERING
PHOTONS
PULSES
RADIANT HEAT TRANSFER
RADIATION PRESSURE
RESONANCE
RUBIDIUM
SEMICLASSICAL APPROXIMATION
TIME DEPENDENCE
TRAPPING
TRAPS