论文标题
钡一氢化钡（BAH）的光学循环，辐射偏转和激光冷却
Optical cycling, radiative deflection and laser cooling of barium monohydride (BaH)
论文作者
论文摘要
我们介绍了由多个光子散射引起的钡单氢化物（BAH）分子的辐射压力挠度和直接激光冷却的第一个实验证明。尽管较小的后坐力速度（2.7毫米/s）和长期激发的寿命（137 ns），但我们使用1060 nm激光灯激发了$ x \ rightarrow $ x \ rightarrow a $ the bah的电子过渡来偏转低温缓冲射击束并减少其横向速度扩散。采用多种实验方法来表征基于速率方程模型的光学循环动力学和基准理论估计值，以及用于完整多级系统的Lindblad Master方程的解决方案。提出了对重金属分子的激光冷却和具有狭窄过渡线宽的磁光诱捕的更广泛影响。我们的结果为生产新类的超低分子（碱土单氢化物）铺平了道路，通过直接的激光冷却和捕获，为实现新方法提供了一种用于输送超速氢原子的新方法（Lane 2015 \ textit \ textit {phys。Rev.a} 92，022511）。
We present the first experimental demonstration of radiation pressure force deflection and direct laser cooling for barium monohydride (BaH) molecules resulting from multiple photon scattering. Despite a small recoil velocity (2.7 mm/s) and a long excited state lifetime (137 ns), we use 1060 nm laser light exciting the $X\rightarrow A$ electronic transition of BaH to deflect a cryogenic buffer-gas beam and reduce its transverse velocity spread. Multiple experimental methods are employed to characterize the optical cycling dynamics and benchmark theoretical estimates based on rate equation models as well as solutions of the Lindblad master equation for the complete multilevel system. Broader implications for laser cooling and magneto-optical trapping of heavy-metal-containing molecules with narrow transition linewidths are presented. Our results pave the way for producing a new class of ultracold molecules -- alkaline earth monohydrides -- via direct laser cooling and trapping, opening the door to realizing a new method for delivering ultracold hydrogen atoms (Lane 2015 \textit{Phys. Rev. A} 92, 022511).
