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Acta Optica Sinica

一维σ^＋—σ^—冷却光和再抽运光对多能级钠原子作用研究

刘勋铭, 王育竹

Published Jan 1, 1998• 0 citations
OpenAlex

Abstract

表述了包含钠２４个磁能级的原子在一维σ＾＋－σ＾－冷却光和再抽运光中各磁子能级粒子分布随时间变化的公式及多普勒冷却力，计算并讨论了不同冷却光失谱情况，不同抽抽运光强和失谐情况下原子的多普勒冷却力的上能级粒子数占基态总粒子数的比例Ｐ（ｖ）随速度的变化，该模型的计算结果能解释在磁光陷阱（ＭＯＴ）实验中的现象和和为磁光陷阱实验选择参数时的参考。

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arXiv:2104.07984•New Journal of Physics•Jun 1, 2021•8 citations
表述了包含钠２４个磁能级的原子在一维σ＾＋－σ＾－冷却光和再抽运光中各磁子能级粒子分布随时间变化的公式及多普勒冷却力，计算并讨论了不同冷却光失谱情况，不同抽抽运光强和失谐情况下原子的多普勒冷却力的上能级粒子数占基态总粒子数的比例Ｐ（ｖ）随速度的变化，该模型的计算结果能解释在磁光陷阱（ＭＯＴ）实验中的现象和和为磁光陷阱实验选择参数时的参考。
We consider a magneto-optical trap (MOT) formed by elliptically polarised waves for 24 Mg atoms on a closed optical 3 P 2 → 3 D 3 ( λ = 383.8 nm ) transition in the ε − θ − ε ¯ configuration of the field. Compared with a known MOT formed by circularly polarised waves ( σ + − σ − configuration), the suggested configuration of the trap formed by fields of ε − θ − ε ¯ configuration allows deeper sub-Doppler cooling of trapped 24 Mg atoms, which cannot be implemented in a conventional trap formed by fields of σ + − σ − configuration.
量子成像是量子信息的一个重要分支，即利用量子的非局域特性实现非局域成像。经典的热光源能否模拟量子的这一性质？在已有理论工作的基础上，我们搭建了赝热光实验平台，研究了赝热光的统计性质，提出了时域空间上交叉谱纯的验证方法，并在实验上验证了方法的正确性及可操作性。首次通过实验验证了非相干光照射条件下，对两维的振幅和位相物体的无透镜傅立叶变换衍射成像，同时还研究了样本数对图像收敛性的影响，及“鬼”对不同频率的响应。
Abstract Magneto-optical trapping (MOT) is a key technique on the route towards ultracold molecular ensembles. However, the realization and optimization of magneto-optical traps with their wide parameter space is particularly difficult. Here, we present a very general method for the optimization of molecular magneto-optical trap operation by means of Bayesian optimization. As an example for a possible application, we consider the optimization of a calcium fluoride MOT for maximum capture velocity. We find that both the X 2Σ+ to A 2Π1/2 and the X 2Σ+ to B 2Σ+ transition to allow for capture velocities with 24 m s−1 and 23 m s−1 respectively at a total laser power of 200 mW. In our simulation, the optimized capture velocity depends logarithmically on the beam power within the simulated power range of 25 to 400 mW. Applied to heavy molecules such as BaH, BaF, YbF and YbOH with their low capture velocity MOTs it might offer a route to far more robust MOT.