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

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.