用于锂原子的自对准循环交叉光偶极阱
A self-aligning recirculated crossed optical dipole trap for lithium atoms
AI总结：
本文提出一种具有固有稳定性的自对准循环交叉光偶极阱设计，通过精确调谐放大率为一的成像系统实现光阱移动且保持对准，并利用$^6$Li原子验证了4.3 mm移动范围内的对准稳定性。
摘要：
交叉光偶极阱（ODTs）提供对冷原子及其他可光陷俘粒子的三维囚禁。然而，维持两束囚禁光束相交的需求对对准稳定性提出了严格要求，并限制了移动光阱的能力。在此，我们展示了一种新颖的交叉ODT设计，其具有光束相交的固有稳定性，允许光阱移动并保持对准。该光阱由一束高功率激光束组成，该光束以一定角度成像回自身以形成交叉光阱。自对准行为源于采用了一个正放大率被精确调谐为一的成像系统。我们利用激光冷却的$^6$Li原子样品证明，该光阱在沿大致垂直于包含交叉光束平面的轴线4.3 mm的移动范围内保持良好对准。我们的方案可用于将保持在交叉ODT中的原子云移近表面或场源，以用于量子模拟、传感和信息处理中的各种应用。
英文摘要：
Crossed optical dipole traps (ODTs) provide three-dimensional confinement of cold atoms and other optically trappable particles. However, the need to maintain the intersection of the two trapping beams poses strict requirements on alignment stability, and limits the ability to move the trap. Here we demonstrate a novel crossed ODT design that features inherent stability of the beam crossing, allowing the trap to move and remain aligned. The trap consists of a single high-power laser beam, imaged back onto itself at an angle to form a crossed trap. Self-aligning behavior results from employing an imaging system with positive magnification tuned precisely to unity. We employ laser-cooled samples of $^6$Li atoms to demonstrate that the trap remains well-aligned over a 4.3 mm travel range along an axis approximately perpendicular to the plane containing the crossed beams. Our scheme can be applied to bring an atomic cloud held in a crossed ODT close to a surface or field source for various applications in quantum simulation, sensing, and information processing.
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