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A narrow-linewidth, dual-wavelength laser system is vital for the creation ofultracold ground state molecules via stimulated Raman adiabatic passage(STIRAP) from a weakly bound Feshbach state. Here we describe how a relativelysimple apparatus consisting of a single fixed-length optical cavity can be usedto narrow the linewidth of the two different wavelength lasers required forSTIRAP simultaneously. The frequency of each of these lasers is referenced tothe cavity and is continuously tunable away from the cavity modes through theuse of non-resonant electrooptic modulators. Self-heterodyne measurementssuggest the laser linewidths are reduced to several hundred Hz. In the contextof 87Rb133Cs molecules produced via magnetoassociation on a Feshbach resonance,we demonstrate the performance of the laser system through one- and two-photonmolecular spectroscopy. Finally, we demonstrate transfer of the molecules tothe rovibrational ground state using STIRAP.

A Simple, Versatile Laser System for the Creation of Ultracold Ground State Molecules