Observation of Electromagnetically Induced Transparency in a Zeeman—Sublevel System in Rubidium Atomic Vapour

We observed electromagnetically induced transparency (EIT) in a Zeeman-sublevel system using rubidium atomic vapour at the temperature of 75~C, in which the width of the EIT signal is only 0.6 MHz. Two different methods were performed to observe the EIT signal in our experiment.     

外腔半导体激光器激光波长连续可调范围的研究

在此研究了利特曼结构和利特罗结构的外腔半导体激光器激光波长连续可调范围和反射镜转轴等关键几何位置与结构的机械加工或制作误差的关系，详细分析了由于制作工艺、技术精度等因素所造成的各种误差对激光器连续可调谐范围的影响。     

@—激光冷却与囚禁的原子喷泉

本文介绍了激光冷却与囚禁的原子喷泉的主要环节，首先介绍了与原子喷泉有密切关系的光学粘团和原子的原理和结构，然后介绍了原子喷泉的实验装置、实验步骤和实验结果。     

双色激光场中原子聚速效应和多光子共振的关系

从双色激光场中运动原子的受激跃迁速率和激光场对原子的辐射压力关系出发，讨论了运动原子在驻波场中速度聚集效应产和珠原因及其与多光子过程的关系，给出了聚速效应出现的条件，预言了极值聚速速度的存在，通过简单的，变换，将驻波场原五速度聚集效应的相结论推广至双色激光场。     

原子饱和吸收谱谐波稳频短期稳定度研究

介绍了利用腔外饱和吸收谱的三次谐波和五次谐波稳频方法对半导体激光器进行稳频的原理,分析了使用这两种稳频方法对半导体激光器进行稳频时所得到的激光频率短期稳定度的理论估算方法,提出了通过选取最佳调制深度来优化短期稳定度的方法和原理,并在理论上比较了两种稳频方法得到的短期稳定度的差异。然后讨论了半导体激光稳频电路系统的设计,并利用该电路系统,分别用三次谐波和五次谐波稳频的方法将半导体激光器的频率锁定在的^87Rb饱和吸收的F=2→F′=3,1线上,并使用我们提出的短期稳定度优化方案进行稳定度优化,通过对误差信号的分析,估算出的频率稳定度达到10^-12的量级,使用采集到的误差信号在实验上比较了两种稳频方法所得的稳定度的,其结果和理论基本吻合。     

Transferring the stability of iodine-stabilized diode laser at 634 nm to radio frequency by an optical frequency comb

An optical flequency comb phase-locked on an iodine frequency stabilized diode laser at 634 nm is constructed to transfer the accuracy and stability from the optical domain to the radio frequency domain. An external-cavity diode laser is frequency-stabilized on the Doppler-free absorption signals of the hyperfine transition R（80）8-4 using the third-harmonic detection technique. The instability of the ultra-stable optical oscillator is determined to be 7 ×10^-12 by a cesium atomic clock via the optical frequency comb＇s mass frequencv dividing technique.     

Ultra-Stable Rubidium-Stabilized External-Cavity Diode Laser Based on the Modulation Transfer Spectroscopy Technique

We construct an ultra-stable external-cavity diode laser via modulation transfer spectroscopy referencing on a hyperfine component of the ST Rb D2 lines at 780 nm. The Doppler-free dispersion-like modulation transfer signal is obtained with high signal-to-noise-ratio. The instability of the laser frequency is measured by beating with an optical frequency comb which is phase-locked to an ultra-stable oven controlled crystal oscillator. The Allan deviation is 3.9 × 10-13 at I s averaging time and 9.8 ×10-14 at 90s averaging time.     

High Field Seeking State Atom Laser and Properties of Flux

We present an experimental study on the continuous atom laser. The experiments show that a high field seeking state atom laser with stable flux can be formed by increasing the strength of outcoupling before large density fluctuations appear. It is easy to obtain a long length or high speed output with this kind of atom laser.     

Frequency Stability of Atomic Clocks Based on Coherent Population Trapping Resonance in ^85Rb

An atomic clock system based on coherent population trapping （CPT） resonance in 85Rb is reported, while most past works about the CPT clock are in ST Rb. A new modulation method （full-hyperfine-frequency-splitting modulation） is presented to reduce the effect of light shift to improve the frequency stability of the CPT clock in SSRb. The experimental results show that the short-term frequency stability of the CPT clock in SSRb is in the order of 10^-10/s and the long-term frequency stability can achieve 1.5 × 10^-11/80000s, which performs as well as 87 Rb in CPT resonance. This very good frequency stability performance associated with the low-cost and low-power properties of SSRb indicates that an atomic clock based on CPT in SSRb should be a promising candidate for making the chip scale atomic clock.     

Momentum filtering scheme of cooling atomic clouds for the Chinese Space Station

To obtain cold atom samples with temperatures lower than 100 pK in the cold atom physics rack experiment of the Chinese Space Station, we propose to use the momentum filtering method for deep cooling of atoms. This paper introduces the experimental results of the momentum filtering method verified by our ground testing system. In the experiment, we designed a specific experimental sequence of standing-wave light pulses to control the temperature, atomic number,and size of the atomic cloud. The r...