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

中文翻译：

---

Λ-冷却极性分子的偏振增强深光学偶极子俘获

我们展示了通过 in-trap 将 SrF 分子加载到光偶极阱 (ODT) 中 $\mathrm{\Lambda }$- 增强灰糖蜜冷却。我们发现这种冷却可以通过适当的相对ODT和冷却光束偏振来优化。在这种优化配置中，我们观察到温度低至$14(1)\mu \mathrm{钾}$ 在深度达 $570\mu \mathrm{钾}$. 使用优化的参数，我们转移$～5\%$ 分子从我们的射频磁光阱进入 ODT，密度为 $～2\times {10}^9{\mathrm{厘米}}^{-3}$, 相空间密度为 $～2\times {10}^{-7}$，并且陷阱寿命为 $～1\mathrm{秒}$.