Langin Thomas K, Jorapur Varun, Zhu Yuqi, Wang Qian, DeMille David
Department of Physics, Yale University, New Haven, Connecticut, Connecticut 06520, USA.
Yale Quantum Institute, Yale University, New Haven, Connecticut 06520, USA.
Phys Rev Lett. 2021 Oct 15;127(16):163201. doi: 10.1103/PhysRevLett.127.163201.
We demonstrate loading of SrF molecules into an optical dipole trap (ODT) via in-trap Λ-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) μK in traps with depths up to 570 μK. With optimized parameters, we transfer ∼5% of molecules from our radio-frequency magneto-optical trap into the ODT, at a density of ∼2×10^{9} cm^{-3}, a phase space density of ∼2×10^{-7}, and with a trap lifetime of ∼1 s.
我们展示了通过阱内Λ增强灰色 molasses 冷却将 SrF 分子加载到光学偶极阱（ODT）中。我们发现，通过适当选择相对的 ODT 和冷却光束偏振，可以优化这种冷却。在这种优化配置下，我们在深度高达 570 μK 的阱中观察到温度低至 14(1) μK 的分子。通过优化参数，我们将约 5%的分子从射频磁光阱转移到 ODT 中，密度约为 2×10⁹ cm⁻³，相空间密度约为 2×10⁻⁷，阱寿命约为 1 s。
