Single and two photon spectroscopy of ultracold dipolar $^{\mathrm{6}}$Li-$^{\mathrm{40}}$K molecules

Ultracold heteronuclear dimers of $^{\mathrm{6}}$Li-$^{\mathrm{40}}$K, in their deeply-bound ro-vibronic states possess a large electric dipole moment. This makes them a suitable candidate for investigating long-range anisotropic dipole-dipole interactions. Starting from a sympathetically-cooled, quantum-degenerate mixture of $^{\mathrm{6}}$Li and $^{\mathrm{40}}$K, we create weakly-bound $^{\mathrm{6}}$Li-$^{\mathrm{40}}$K molecules via a magnetic-Feshbach association with a sole singlet admixture. High-resolution laser spectroscopy of the electronically-excited $B^{1}\Pi $ and $A{ }^{1}\Sigma $ potentials of $^{\mathrm{6}}$Li-$^{\mathrm{40}}$K Feshbach molecules is performed to identify intermediate vibrational states suitable for coherent Raman transfer to the electronic ground state. Subsequently, Autler-Townes spectroscopy is performed to investigate the deeply-bound ro-vibrational levels of the electronic ground state of $^{\mathrm{6}}$Li-$^{\mathrm{40}}$K molecules. Results of the single and two-photon molecular spectroscopy are presented in this talk.