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Sökning: WFRF:(Allegrini F.) > (2003-2004)

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1.
  • Bezuglov, NN, et al. (författare)
  • Time-dependent radiative transfer in magneto-optical traps
  • 2003
  • Ingår i: Physical Review A (Atomic, Molecular and Optical Physics). - 1050-2947. ; 68:6: 063415
  • Tidskriftsartikel (refereegranskat)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.
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2.
  • Loo, F. Y., et al. (författare)
  • Investigations of a two-level atom in a magneto-optical trap using magnesium
  • 2004
  • Ingår i: Journal of Optics B-Quantum and Semiclassical Optics. - : IOP Publishing. - 1464-4266 .- 1741-3575. ; 6:1, s. 81-85
  • Tidskriftsartikel (refereegranskat)abstract
    • Magnesium atoms are cooled in a magneto-optical trap (MOT) using the 3s(2 1)S(0) --> 3s3p P-1(1) resonance transition. Magnesium is a simple atom which offers a unique possibility for comparison to the Doppler theory of laser cooling. We measure trap parameters as a function of laser-intensity, -detuning and magnetic field gradient. We find the main features well accounted for by Doppler theory, but temperature measurements gave significant higher values than predicted by the Doppler theory. We also observe radiation pressure effects within the MOT that limit the maximum achievable density. Comparing our results to predictions by models in the literature shows a good agreement. Recently we have improved our set-up and now trap about 150 x 10(6) atoms.
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Allegrini, M. (2)
Molisch, Andreas (1)
Andersen, N. (1)
Fuso, F. (1)
Bezuglov, NN (1)
Fioretti, A (1)
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Gabbanini, C (1)
Sauge, Sebastien (1)
Thomsen, J. W. (1)
Loo, F. Y. (1)
Brusch, A. (1)
Arimondo, E. (1)
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