We report measurements of the AC polarizabilities of ultracold ground-state ${}^{23}\mathrm{Na}{}^{87}\mathrm{Rb}$ molecules. While the polarizability of the ground rotational state $J=0$ is isotropic, that of the first excited rotational state $J=1$ is anisotropic and depends strongly on the light polarization angle. We obtain both polarizabilities precisely by combining trap oscillation frequency measurement and high-resolution rotational spectroscopy driven by microwave. With the optimized light polarization angle and intensity combination, the nonuniformity of the differential AC Stark shift between the two rotational states is minimized and the rotational coherence time is observed to be the longest.

中文翻译：

---

超冷基态Na23Rb87分子的各向异性极化率

我们报告了超冷基态交流极化率的测量 ${}^{23}娜{}^{87}b$分子。而极化旋转状态的基态$Ĵ=0$ 是各向同性的，即第一激发旋转状态的各向同性 $Ĵ=\mathrm{1个}$是各向异性的，并且在很大程度上取决于光的偏振角。通过将陷波振荡频率测量和微波驱动的高分辨率旋转光谱学结合起来，我们可以精确地获得两种极化率。通过优化的光偏振角和强度组合，可以最小化两个旋转状态之间的差分AC Stark位移的不均匀性，并且观察到旋转相干时间最长。