Research output: Contribution to journal › Article
Nonlinear effects in optical pumping of a cold and slow atomic beam. / Porfido, N.; Bezuglov, N. N.; Bruvelis, M.; Shayeganrad, G.; Birindelli, S.; Tantussi, F.; Guerri, I.; Viteau, M.; Fioretti, A.; Ciampini, D.; Allegrini, M.; Comparat, D.; Arimondo, E.; Ekers, A.; Fuso, F.
In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 92, 2015.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Nonlinear effects in optical pumping of a cold and slow atomic beam
AU - Porfido, N.
AU - Bezuglov, N. N.
AU - Bruvelis, M.
AU - Shayeganrad, G.
AU - Birindelli, S.
AU - Tantussi, F.
AU - Guerri, I.
AU - Viteau, M.
AU - Fioretti, A.
AU - Ciampini, D.
AU - Allegrini, M.
AU - Comparat, D.
AU - Arimondo, E.
AU - Ekers, A.
AU - Fuso, F.
PY - 2015
Y1 - 2015
N2 - By photoionizing hyperfine (HF) levels of the Cs state 6 2 P 3/2 in a slow and cold atom beam, we find how their population depends on the excitation laser power. The long time (around 180 μs) spent by the slow atoms inside the resonant laser beam is large enough to enable xploration of a unique atom-light interaction regime heavily affected by time-dependent optical pumping. We demonstrate that, under such conditions, the onset of nonlinear effects in the population dynamics and optical pumping occurs at excitation laser intensities much smaller than the conventional respective saturation values. The evolution of opulation within the HF structure is calculated by numerical integration of the multilevel optical Bloch equations. The agreement between numerical results and experiment outcomes is excellent. All main features in the experimental findings are explained by the occurrence of “dark” and “bright” resonances leading to power-dependent branching coefficients.
AB - By photoionizing hyperfine (HF) levels of the Cs state 6 2 P 3/2 in a slow and cold atom beam, we find how their population depends on the excitation laser power. The long time (around 180 μs) spent by the slow atoms inside the resonant laser beam is large enough to enable xploration of a unique atom-light interaction regime heavily affected by time-dependent optical pumping. We demonstrate that, under such conditions, the onset of nonlinear effects in the population dynamics and optical pumping occurs at excitation laser intensities much smaller than the conventional respective saturation values. The evolution of opulation within the HF structure is calculated by numerical integration of the multilevel optical Bloch equations. The agreement between numerical results and experiment outcomes is excellent. All main features in the experimental findings are explained by the occurrence of “dark” and “bright” resonances leading to power-dependent branching coefficients.
U2 - 10.1103/PhysRevA.92.043408
DO - 10.1103/PhysRevA.92.043408
M3 - Article
VL - 92
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
SN - 1050-2947
ER -
ID: 3970478