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Zeitschrift für Physik D Atoms Molecules and Clusters

The influence of atomic velocity distribution on optical pumping of an atomic beam

Ganghua Mei

Published Dec 1, 1993• 0 citations
Publisher
DOI
10.1007/bf01437294

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Using rate equation formalism, we got an analytic expression describing the optical pumping of an alkali atomic beam in strong magnetic fields. By comparing with the traditional description in single velocity approximation, the influence of velocity distribution in a practical alkali atomic beam on the pumping effect was quantitatively discussed. It turned out that the rate equation treatment in single velocity approximation might result in an error within twenty percent. Laser optical pumping of 7 Li atomic beam in a strong magnetic field (0.15 T) was experimentally studied, and the results are in agreement with the theory in which the velocity distribution is taken into account.
We study the influence of optical pumping on Doppler-broadened alkali-metal-atom DDD line spectra by solving the time-dependent density matrix for an open two-level system. The time-dependent absorption is averaged over the distribution of interaction times obtained from the three-dimensional beam geometry and atomic velocity distribution and over the longitudinal velocity distribution. The optical pumping is significant at much lower intensities than saturation and depends strongly on the intensity, beam radius, vapor cell length, and spontaneous-decay branching ratio. The result is in agreement with our earlier steady-state solution for a wide range of parameters and predicts two interesting line-shape features.