Loading atom lasers by collectivity-enhanced optical pumping

TL;DR

This paper investigates how collective interactions among atoms in a beam enhance optical pumping efficiency for atom lasers, enabling better trapping and controllable atomic correlations through laser field manipulation.

Contribution

It introduces a model demonstrating that high-density atomic beams exhibit collective effects that improve trapping efficiency and allow control over atomic correlations.

Findings

Collective effects enhance population of the trapping state.

Spontaneous emission is modified by particle interactions.

Atomic correlations can be controlled via laser fields.

Abstract

The effect of collectivity on the loading of an atom laser via optical pumping is discussed. In our model, atoms in a beam are laser-excited and subsequently spontaneously decay into a trapping state. We consider the case of sufficiently high particle density in the beam such that the spontaneous emission is modified by the particle interaction. We show that the collective effects lead to a better population of the trapping state over a wide range of system parameters, and that the second order correlation function of the atoms can be controlled by the applied laser field.