Theory of robust subrecoil cooling by STIRAP

TL;DR

This paper presents a robust Raman cooling method using STIRAP in a three-level atom, achieving subrecoil temperatures with insensitivity to pulse variations, offering improved control over cooling parameters.

Contribution

It introduces a novel STIRAP-based Raman cooling technique that is more robust to pulse variations compared to standard methods.

Findings

Subrecoil temperatures are achievable with the proposed method.

The excitation profile's insensitivity enhances cooling robustness.

Two variants of cooling demonstrate effective temperature reduction.

Abstract

We demonstrate one-dimensional robust Raman cooling in a three-level $\Lambda$-type atom, where the velocity-selective transfer is carried out by a STIRAP pulse. In contrast to the standard Raman method, the excitation profile is insensitive to variations in the pulse duration, whereas its position and width are nevertheless under control. Two different cooling variants are examined and we show that subrecoil temperatures are attainable in both cases.