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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 4μK 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 4μK 在广泛的激光强度、失谐(一光子和二光子)和磁场范围内。磁不敏感性使得在四极磁场的连续操作下通过交替GMC和MOT能够实现分子云的空间压缩。这些技术的结合产生了自由空间中具有最高相空间密度的激光冷却分子样品。
更新日期:2020-06-03
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