Long distance optical transport of ultracold atoms: A compact setup using a Moir\'e lens

TL;DR

This paper introduces a compact, stable optical transport system for ultracold atoms over long distances using a focus-tunable Moiré lens, achieving high efficiency and minimal temperature change, simplifying experimental setups.

Contribution

It demonstrates the use of a market-available Moiré lens for long-distance ultracold atom transport, offering advantages over traditional lenses in stability and compactness.

Findings

Transport distance of 465 mm achieved

70% transfer efficiency with negligible temperature change

Moiré lens outperforms fluid-based and linear stage lenses

Abstract

We present a compact and robust setup to optically transport ultracold atoms over long distances. Using a focus-tunable Moir\'e lens that has recently appeared on the market, we demonstrate transport of up to a distance of 465 mm. A transfer efficiency of 70% is achieved with negligible temperature change at 11 $\mu$K. With its high thermal stability and low astigmatism, the Moir\'e lens is superior to fluid-based varifocal lenses. It is much more compact and stable than a lens mounted on a linear translation stage, allowing for simplified experimental setups.