# Fast and dense magneto-optical traps for Strontium

## TL;DR

This paper presents an improved, faster, and more robust method for cooling and trapping strontium atoms using enhanced SWAP cooling combined with standard techniques, achieving high atom numbers and phase-space densities.

## Contribution

The authors develop a simplified, efficient cooling technique for strontium that outperforms traditional methods in speed and robustness, enabling dense magneto-optical traps.

## Key findings

- Achieved $6\times 10^7$ bosonic $^{88}$Sr atoms in the trap.
- Reached phase-space densities of $2\times 10^{-3}$ for bosonic and $1.4\times 10^{-4}$ for fermionic isotopes.
- Method is easy to implement and improves trapping efficiency.

## Abstract

We improve the efficiency of sawtooth-wave-adiabatic-passage (SWAP) cooling for strontium atoms in three dimensions and combine it with standard narrow-line laser cooling. With this technique, we create strontium magneto-optical traps with $6\times 10^7$ bosonic $^{88}$Sr ($1\times 10^7$ fermionic $^{87}$Sr) atoms at phase-space densities of $2\times 10^{-3}$ ($1.4\times 10^{-4}$). Our method is simple to implement and is faster and more robust than traditional cooling methods.