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We demonstrate loading of SrF molecules into an optical dipole trap (ODT) viain-trap $\Lambda$-cooling. We find that this cooling can be optimized by aproper choice of relative ODT and $\Lambda$ beam polarizations. In thisoptimized 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, wetransfer $\!\sim\!5$% of molecules from our radio-frequency magneto-opticaltrap into the ODT, at a density of $\sim\!2\times 10^{9}$ cm$^{-3}$, a phasespace density of $\sim\!2\times 10^{-7}$, and with a trap lifetime of$\!\sim\!1$ s.

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