相干布居数囚禁原子频标的实现及相关实验参数研究

原子频标要求高信噪比和窄线宽的鉴频信号,但对于被动型相干囚禁态原子频标(CPT频标), 改善鉴频信号信噪比以增加线宽为代价,因此选择合适的信噪比和线宽组合是研制CPT原子频标频标的重要环节。文章介绍了用桌面CPT频标系统地研究了鉴频信号与温度、光强等参数的关系所获得的研究结果,由此获得了合适选取的信噪比与线宽组合的依据。文章还给出了关于光源非理想偏振导致的消相干效应对CPT频标的影响所开展的实验结果。文章所提供的研究结果不仅帮助我们研制成功了CPT频标,而且对于CPT物理现象研究和其他CPT频标的研制也有参考价值。     

冷原子干涉仪及空间应用

原子干涉仪是利用原子物质波的特性而实现的干涉仪,冷原子具有很小的速度和速度分布以及良好的相干性,因而冷原子干涉仪具有很高的灵敏度.文章介绍了原子干涉仪的基本物理原理、国内外研究进展、原子干涉仪实现方案及其在精密测量和空间科学领域中的应用.     

硫杂杯芳烃及其衍生物的合成与表征

合成了硫杂杯[4]芳烃及其几种衍生物。并用核磁共振、元素分析、红外、质 谱等对所合成化合物进行了表征。     

In situ calibrated angle between the quantization axis and the propagating direction of the light field for trapping neutral atoms

The recently developed magic-intensity trapping technique of neutral atoms efficiently mitigates the detrimental effect of light shifts on atomic qubits and substantially enhances the coherence time. This technique relies on applying a bias magnetic field precisely parallel to the wave vector of a circularly polarized trapping laser field. However, due to the presence of the vector light shift experienced by the trapped atoms, it is challenging to precisely define a parallel magnetic field, espe...     

原子的玻色-爱因斯坦凝聚

综述了玻色－－爱因斯坦凝聚（ＢＥＣ）实验研究工作的进展，介绍了玻色－爱因斯坦凝集的概念、形成条件和相关的实验技术，叙述了玻色－爱因斯坦凝集体（ＢＥＣ）和物理性质，展望了发展前景。     

Narrowband switchable dual-passband atomic filter with four-wave mixing optical amplification

By using Faraday optical filter combined with four-wave mixing (FWM) amplifier, a narrow bandwidth optical amplifying atomic filter with switchable dual-passband is demonstrated experimentally. The two transmission peaks of the filter correspond to the Stokes and anti-Stokes frequencies, exhibiting a Raman gain in 13- and 17-fold, respectively, with bandwidth of ～120 MHz. By properly setting pump laser detuning, switching between filter passbands is realized. We also investigate the dependence of peak transmission on both pump laser intensity and Rb cell temperature. This atomic filter can find practical applications in long-distance laser communications and laser remote-sensing systems.     

High-Fidelity Manipulation of the Quantized Motion of a Single Atom via Stern–Gerlach Splitting

We demonstrate high-fidelity manipulation of the quantized motion of a single⁸⁷Rb atom in an optical tweezer via microwave couplings induced by Stern–Gerlach splitting. The Stern–Gerlach splitting is mediated by polarization gradient of a strongly focused tweezer beam that functions as fictitious magnetic field gradient. The spatial splitting removes the orthogonality of the atomic spatial wavefunctions, thus enables the microwave couplings between the motional states. We obtain coher...     

Direct Measurement of Light Speed Reduction in a Rubidium Vapour Medium Coherently Prepared by Electromagnetically Induced Transparency

We have experimentally observed the reduction of light speed in a rubidium vapour medium coherently preparedby electromagnetically induced transparency. The light speed reduction was deduced by directly measuring thetime delay of a probe light when it passed through the medium. The time delay varies with the intensity of thecoupling laser, and the typical time delay we recorded was 1.8 μs, corresponding to a light speed of 56000 m/s.     

Determination of the 5d6p 3F4-5d2 3F transition probabilities of Ba I

Whether the transitions between 6s5d ³D and 5d6p ³F can be used for laser cooling of barium heavily depends upon the transition probabilities of 5d6p ³F-5d^{2 3}F. Taking the transition 6s5d ³D₃-5d6p ³F⁴ as a scale, the leakage rate of 5d6p ³F₄-5d^{2 3}F was used to evaluate the transition probabilities. 706 nm laser pulses with different durations were applied to a barium atomic beam for 6s5d ³D₃-5d^{2 3}F₄ optical pumping, and the remaining percentages in 6s5d ³D₃ were measured. After exponential fitting, the transition probability of 5d6p ³F₄-5d^{2 3}F_3,4 was determined to be 2.1(4)×10⁴ s^?1, which is in agreement with theoretical calculations using the scaled Thomas-Fermi-Dirac method.     

Optical Guiding of Trapped Atoms by a Blue-Detuned Hollow Laser Beam in the Horizontal Direction

Optical guiding of ^Rb atoms in a magneto-optical trap (MOT) by a blue-detuned horizontal hollow laser beam is demonstrated experimentally. The guiding efficiency and the velocity distribution of the guided atoms are found to have strong dependence on the detuning of the guiding laser. In particular, the optimum guiding occurs when the blue detuning of the hollow laser beam is approximately equal to the hyperfine structure splitting of the ^85Rb ground states, in good agreement with the theoretical analysis based on a three-level model.