Efficient Two-dimensional Subrecoil Raman Cooling of Atoms in a Tripod Configuration

TL;DR

This paper introduces an efficient 2D Raman cooling technique for neutral atoms in a tripod configuration, achieving subrecoil temperatures with only three laser beams, enabling rapid and effective cooling in two dimensions.

Contribution

The paper presents a novel 2D Raman cooling method for neutral atoms using a tripod system, reducing complexity and improving cooling efficiency over previous techniques.

Findings

Achieved atomic velocity spread down to 0.1 times recoil velocity

Effective temperature reached as low as 0.01 times recoil temperature

Cooling process described by a simple, rapid model

Abstract

We present an efficient method for subrecoil cooling of neutral atoms by applying Raman cooling in 2D to a four-level tripod-system. The atoms can be cooled simultaneously in two directions using only three laser beams. We describe the cooling process with a simple model showing that the momentum distribution can be rapidly narrowed to velocity spread down to $0.1v_\text{rec}$, corresponding to effective temperature equal to $0.01T_\text{rec}$. This method opens new possibilities for cooling of neutral atoms.