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Starting from weakly bound Feshbach molecules, we demonstrate a two-photonpathway to the dipolar ground state of bi-alkali molecules that involves onlysinglet-to-singlet optical transitions. This pathway eliminates the search fora suitable intermediate state with sufficient singlet-triplet mixing and theexploration of its hyperfine structure, as is typical for pathways startingfrom triplet dominated Feshbach molecules. By selecting a Feshbach state with astretched singlet hyperfine component and controlling the polarization of theexcitation laser, we assure coupling to only a single hyperfine component ofthe $\textrm{A}^{1}\Sigma^{+}$ excited potential, even if the hyperfinestructure is not resolved. Similarly, we address a stretched hyperfinecomponent of the $\textrm{X}^{1}\Sigma^{+}$ rovibrational ground state, andtherefore an ideal three level system is established. We demonstrate thispathway with ${}^{6}\textrm{Li}{}^{40}\textrm{K}$ molecules. By exploringdeeply bound states of the $\textrm{A}^{1}\Sigma^{+}$ potential, we are able toobtain large and balanced Rabi frequencies for both transitions. This methodcan be applied to other molecular species.

Singlet Pathway to the Ground State of Ultracold Polar Molecules