AI 中文总结
该研究利用荧光光谱和飞行时间技术，对由二维磁光阱产生并经共振推束传输的锶原子束进行表征，通过测量得出不同参数下的通量分布等特性，为3D MOT加载和原子干涉仪等应用的冷原子源表征提供了框架。
AI 中文摘要
我们展示了一种用于表征锶原子束的方法，该原子束由二维磁光阱产生并通过共振推束传输，采用荧光光谱和飞行时间（ToF）技术。这能深入了解冷原子源的束流特性，可直接测量横向速度展宽、纵向速度分布、发散度以及可捕获通量以进行进一步冷却。通过ToF测量，利用单向和反向传播的共振探测束，在不同推束饱和参数（$s_{\mathrm{push}}$）下得出一系列纵向速度的通量分布。应用模拟得出的因子来处理单向探测纵向速度分布中的散射率缩放差异。将分布积分至估计的3D - MOT捕获速度\(30\)米/秒。对于我们的系统，发现在\(s_{\mathrm{push}} = 0.45\)时，使用单向探测束和反向传播探测束分别获得通量\((1.7 \pm 0.4)\times10^{8}\)原子/秒和\((1.5 \pm 0.4)\times10^{8}\)原子/秒。这些测量为表征用于3D MOT加载和原子干涉仪等应用的冷原子源提供了框架。
英文摘要
We demonstrate a characterisation methodology for a strontium atomic beam, produced by a two-dimensional magneto-optical trap and delivered via a resonant push beam, using fluorescence spectroscopy and time-of-flight (ToF). This provides insight into the beam characteristics of a cold atom source, allowing for direct measurement of the transverse velocity spread, longitudinal velocity distributions, divergence, and the capturable flux for further cooling. From the ToF measurements, we derive a series of flux-per-longitudinal-velocity distributions at varying push saturation parameters ($s_{\mathrm{push}}$) using both a unidirectional and counter-propagating resonant probe beam. A simulation-derived factor is applied to the unidirectional probe longitudinal velocity distribution to account for differences in the scattering rate scaling. The distributions are integrated up to an estimated 3D-MOT capture velocity of \SI{30}{\meter\per\second}. For our system, we find that at $s_{\mathrm{push}} = 0.45$, we obtain a flux of $(1.7 \pm 0.4)\times10^{8}$ atoms/s and $(1.5 \pm 0.4)\times10^{8}$ atoms/s, using a unidirectional probe beam and counter-propagating probe, respectively. These measurements provide a framework for characterising cold atomic sources for applications such as 3D MOT loading and atom interferometers.
Comments12 pages, 7 figures
