Optical Production of Stable Ultracold $^{88}$Sr$_2$ Molecules

TL;DR

This paper reports the successful optical production of large, stable samples of ultracold $^{88}$Sr$_2$ molecules in an optical lattice, advancing the field of ultracold chemistry and precision measurement.

Contribution

It introduces a fast, all-optical method for creating ultracold Sr$_2$ molecules with high efficiency using intercombination line photoassociation.

Findings

Molecules are bound by 0.05 cm$^{-1}$ and stable for several milliseconds.

The method relies on a near-unity Franck-Condon factor.

First step toward creating Sr$_2$ in the absolute ground state.

Abstract

We have produced large samples of ultracold $^{88}$Sr$_2$ molecules in the electronic ground state in an optical lattice. The molecules are bound by 0.05 cm$^{-1}$ and are stable for several milliseconds. The fast, all-optical method of molecule creation via intercombination line photoassociation relies on a near-unity Franck-Condon factor. The detection uses a weakly bound vibrational level corresponding to a very large dimer. This is the first of two steps needed to create Sr$_2$ in the absolute ground quantum state. Lattice-trapped Sr$_2$ is of interest to frequency metrology and ultracold chemistry.