Sub-Doppler Cooling and Compressed Trapping of YO Molecules atμKTemperatures,Physical Review X

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Sub-Doppler Cooling and Compressed Trapping of YO Molecules atμKTemperatures
Physical Review X ( IF 11.6 ) Pub Date : 2020-06-03 , DOI: 10.1103/physrevx.10.021049
Shiqian Ding ₁ , Yewei Wu ₁ , Ian A Finneran ₁ , Justin J Burau ₁ , Jun Ye ₁

Affiliation

Complex molecular structure demands customized solutions to laser cooling by extending its general set of principles and practices. Compared with other laser-cooled molecules, yttrium monoxide (YO) exhibits a large electron-nucleus interaction, resulting in a dominant hyperfine interaction over the electron spin-rotation coupling. The YO ground state is thus comprised of two manifolds of closely spaced states, with one of them possessing a negligible Landé

g

factor. This unique energy level structure favors dual-frequency dc magneto-optical trapping (MOT) and gray molasses cooling (GMC). We report exceptionally robust cooling of YO at

4 μ K

over a wide range of laser intensity, detunings (one- and two-photon), and magnetic field. The magnetic insensitivity enables the spatial compression of the molecular cloud by alternating GMC and MOT under the continuous operation of the quadrupole magnetic field. A combination of these techniques produces a laser-cooled molecular sample with the highest phase space density in free space.

中文翻译：

μK 温度下 YO 分子的亚多普勒冷却和压缩捕获

复杂的分子结构需要定制的激光冷却解决方案

g

通过扩展其一般原则和实践。与其他激光冷却分子相比，一氧化钇（YO）表现出较大的电子-核相互作用，导致电子自旋-旋转耦合中的超精细相互作用占主导地位。因此，YO 基态由两个紧密排列的态组成，其中一个具有可忽略不计的朗德 g 因子。这种独特的能级结构有利于双频直流磁光捕获（MOT）和灰糖蜜冷却（GMC）。我们报告了 YO 的异常强劲的冷却