Polarization Enhanced Deep Optical Dipole Trapping of $\Lambda$-cooled Polar Molecules

Abstract

We demonstrate loading of SrF molecules into an optical dipole trap (ODT) via in-trap $\Lambda$-cooling. We find that this cooling can be optimized by a proper choice of relative ODT and $\Lambda$ beam polarizations. In this optimized configuration, we observe molecules with temperatures as low as 14(1) $\mu$K in traps with depths up to 570 $\mu$K. With optimized parameters, we transfer $\sim 5$% of molecules from our radio-frequency magneto-optical trap into the ODT, at a density of $\sim 2\times 10^9$ cm${}^{-3}$, a phase space density of $\sim 2\times 10^{-7}$, and with a trap lifetime of $\sim 1$ s.

arXiv comment7 pages main text (4 figures) plus references, additional 12 pages (2 figures) for supplemental material plus references; incorporated correction to trap depth calculation

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