论文标题
$ $ k温度下的子多普勒冷却和压缩的YO分子捕获
Sub-Doppler Cooling and Compressed Trapping of YO Molecules at $μ$K Temperatures
论文作者
论文摘要
复杂的分子结构通过扩展其一般的原理和实践集，要求对激光冷却进行定制的解决方案。 YTTrium Onexide（YO）具有独特的分子内相互作用。费米连接相互作用主导于自旋旋转耦合，从而产生了两个紧密间隔状态的歧管，其中一个具有可忽略的landéG因子。这种独特的能级结构有利于双频DC磁磁陷阱（MOT）和灰色糖蜜冷却（GMC）。我们报告在宽范围的激光强度，引导（一个和两光子）和磁场上，在4 $μ$ K处的您在4 $ $ k中的稳健冷却非常强。磁不敏感性可以通过在四极杆磁场的连续运行下交替进行GMC和MOT来实现分子云的空间压缩。这些技术的组合产生了一个激光冷却的分子样品，在自由空间中具有最高的相空间密度。
Complex molecular structure demands customized solutions to laser cooling by extending its general set of principles and practices. Yttrium monoxide (YO) has unique intramolecular interactions. The Fermi-contact interaction dominates over the spin-rotation coupling, resulting in 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.
