AI 中文总结
本文提出结合宽带跃迁速度偏移与窄带跃迁速度选择的准直方案，解决高通量原子束准直的力失衡问题，实验与模拟吻合，可制备态标记的准直原子束。
AI 中文摘要
制备连续、高通量且准直的原子束是计量学和材料沉积的重要资源，该领域的发展对基于冷原子的量子实验进步至关重要。但横向光糖冷却等普遍的平衡力方法在高通量原子束下会因吸收诱导的力失衡而性能下降。本文提出一种准直方案，将宽带跃迁用于速度偏移、窄带跃迁用于速度选择，无需依赖等功率反向传播光束即可实现速度选择型原子束准直。准直后的原子被存储在长寿命内部态中，减少了总光散射，可获得态标记的准直原子束。以锶为模型系统的模拟显示，该准直过程高效且无吸收诱导的力失衡，实验结果与预测吻合良好。
英文摘要
Engineering continuous, high-flux, and collimated atomic beams is a useful resource for metrology and material deposition. Developments in this area have been essential for the evolution of cold-atom based quantum experiments, yet the ubiquitous balanced-force methods such as transverse molasses cooling degrade at high atomic flux due to absorption-induced force imbalance. We introduce a collimation scheme that combines the use of a broadband transition for velocity shifting with a narrowband transition for velocity selection, enabling velocity-selective beam collimation without relying on balanced-power counter-propagating beams. Collimated atoms are shelved in a long-lived internal state, reducing the total light scattering and providing a state-heralded collimated beam. Simulations using strontium as a model system show a highly effective collimation process that does not suffer from absorption-induced force-imbalance and experimental results agree well with these predictions.
