Creating dipolar molecules from Bose polarons

We report creation of dipolar ^{23}Na^{40}K molecules in their absolute ground state directly from Bose polarons, dressed K impurities immersed in a Na Bose-Einstein condensate. In contrast to Feshbach molecules, Bose polarons at negative scattering length are long-lived in the presence of the BEC. We demonstrate direct photoassociation from Bose polarons to electronically excited molecular states, dark resonance spectroscopy of the absolute ground state molecular state, and finally stimulated rapid adiabatic passage (STIRAP) of Bose polarons into the molecular ground state, all in the presence of the Na BEC. This leads to a dense molecular gas at temperatures on the order of 70 nK immersed inside a $T/T_c=0.1$ BEC.