Cooling Atoms with a Moving One-Way Barrier

TL;DR

This paper demonstrates a novel optical cooling method using a moving one-way barrier to reduce the temperature of rubidium atoms by nearly half, leveraging adiabatic translation to trap atoms with minimal energy increase.

Contribution

It introduces a new all-optical cooling scheme employing a moving one-way barrier, achieving significant temperature reduction in atomic samples.

Findings

Achieved nearly a factor of 2 reduction in atom temperature.

Demonstrated effective cooling using a moving optical barrier.

Maintained minimal kinetic energy increase during adiabatic translation.

Abstract

We implement and demonstrate the effectiveness of a cooling scheme using a moving, all-optical, one-way barrier to cool a sample of $^{87}$Rb atoms, achieving nearly a factor of 2 reduction in temperature. The one-way barrier, composed of two focused, Gaussian laser beams, allows atoms incident on one side to transmit, while reflecting atoms incident on the other. The one-way barrier is adiabatically swept through a sample of atoms contained in a far-off-resonant, single-beam, optical dipole trap that forms a nearly harmonic trapping potential. As the barrier moves longitudinally through the potential, atoms become trapped to one side of the barrier with reduced kinetic energy. The adiabatic translation of the barrier leaves the atoms at the bottom of the trapping potential, only minimally increasing their kinetic energy.