Light-force-induced fluorescence line-center shifts in high-precision optical spectroscopy: Simple model and experiment

Year: 2000

Authors: Artoni M., Carusotto I., Minardi F.

Autors Affiliation: INFM–European Laboratory of Non-Linear Spectroscopy (LENS), Largo E. Fermi 2, I-50125 Firenze, Italy
Scuola Normale Superiore and INFM, Piazza dei Cavalieri 7, I-56126 Pisa, Italy

Abstract: We calculate the effect of light-induced forces on the fluorescence line shape of a two-level atom crossing at right angles two counterpropagating light beams of parallel linear polarizations (lin ʈ lin) in a common configuration for ultrahigh-precision optical spectroscopy. For an incident atomic beam with a narrow spread of transverse velocities the dipole force induces a redshift of the fluorescence maximum, while in the reverse case of a wide spread of transverse velocities the radiation-pressure force induces a blueshift of the saturation dip minimum. We then use our theory to explain the blueshift of the saturation line-center dip occurring for the closed transition 2 3 S 1 →2 3 P 2 of a 4 He beam. The observed shift, which is in quite good agreement with the theory, can be of the order of 1/10 of the transition natural linewidth and hence quite important for ultrahigh-
precision spectroscopy measurements.


Volume: 62 (2)      Pages from: 023402-1  to: 023402-13

KeyWords: Atomic beams; Atomic spectroscopy; Electron energy levels; Electron transitions; Emission spectroscopy; Equations of motion; Fluorescence; Laser beams; Light absorption; Light polarization; Particle optics; Quantum theory, Dipole pressure force effect; Fluorescence line shape; Parallel linear polarization; Radiation pressure force effect; Ultrahigh precision optical spectroscopy, Atomic physics

Citations: 8
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