Quantum test of the Universality of Free Fall using rubidium and potassium

Tapered-amplified AR-coated laser diodes for Potassium and Rubidium atomic-physics experiments

We present a system of room-temperature extended-cavity grating-diode lasers (ECDL) for production of light in the range 760-790nm. The extension of the tuning range towards the blue is permitted by the weak feedback in the cavity: the diodes are anti-reflection coated, and the grating has just 10% reflectance. The light is then amplified using semiconductor tapered amplifiers to give more than 400mW of power. The outputs are shown to be suitable for atomic physics experiments with potassium (767nm), rubidium (780nm) or both, of particular relevance to doubly-degenerate boson-fermion mixtures.

铷与钾里德堡原子之间的长程相互作用

Long-range interactions between rubidium and potassium Rydberg atoms

本研究计算了n=70激发态下铷-钾里德堡原子的长程两体相互作用势能曲线，发现两类对称相互作用均存在深势阱，建立了相关n标度关系并验证二聚体态的预解离稳定性。

Testing the universality of free fall with rubidium and ytterbium in a very large baseline atom interferometer

We propose a very long baseline atom interferometer test of Einstein's equivalence principle (EEP) with ytterbium and rubidium extending over 10m of free fall. In view of existing parametrizations of EEP violations, this choice of test masses significantly broadens the scope of atom interferometric EEP tests with respect to other performed or proposed tests by comparing two elements with high atomic numbers. In a first step, our experimental scheme will allow reaching an accuracy in the Eötvös ratio of $7\times 10^{-13}$. This achievement will constrain violation scenarios beyond our present k…

Long range dipole-dipole interaction in atomic vapors probed by double-quantum two-dimensional coherent spectroscopy

Optical double-quantum two-dimensional coherent spectroscopy (2DCS) was implemented to probe interatomic dipole-dipole interactions in both potassium and rubidium atomic vapors. The dipole-dipole interaction was detected at densities of $4.81 \times 10^8$ cm$^{-3}$ and $8.40 \times 10^9$ cm$^{-3}$ for potassium and rubidium, respectively, corresponding to a mean interatomic separation of 15.8 $μ$m or $3.0\times 10^5a_0$ for potassium and 6.1 $μ$m or $1.2\times 10^5a_0$ for rubidium, where $a_0$ is the Bohr radius. We report the lowest atomic density at which dipole-dipole interactions are dete…

基于³He的核自旋振荡器用于寻找奇异自旋耦合

Nuclear Spin Oscillator Based on $^3$He to Search for Exotic Spin Coupling

该研究基于³He核构建核自旋振荡器来寻找奇异自旋耦合，通过特定气室极化、自旋交换碰撞等操作，利用法拉第旋转监测核自旋拉莫尔进动，实现自持振荡，其对奇异自旋耦合的灵敏度比现有碱金属原子磁强计高约5倍。

Clean, Robust Alkali Sources by Intercalation within Highly-Oriented Pyrolytic Graphite

We report the fabrication, characterization, and use of rubidium vapor dispensers based on highly-oriented pyrolytic graphite (HOPG) intercalated with metallic rubidium. Compared to commercial chromate salt dispensers, these intercalated HOPG (IHOPG) dispensers hold an order of magnitude more rubidium in a similar volume, require less than one-fourth the heating power, and emit less than one-half as many impurities. Appropriate processing permits exposure of the IHOPG to atmosphere for over ninety minutes without any adverse effects. Intercalation of cesium and potassium into HOPG have also be…