Measuring Transmittance in Rubidium Vapour Cells Using an Extremely Weak Coherent Field of Light

The absorptive properties of the atomic transition in the Rb^85 D2 (A) line (5S1/2-5P3/2) at 780.Onm are measured by using a continuous tunable diode laser and a CCD detector in Rb vapour cell under the condition of extremely weak incident intensity. When the intensity of incident light decreases from 420pW/cm^2 to 0.03pW/cm^2, the transmittance is found to be independent of the incident intensity within our experimental accuracy.     

Coherent spectroscopy of the 87RbFg=1→ Fe=0 closed transition

This paper has observed linewidth narrowing of dark states in rubidium cell by using the Hanle configuration. The reduction of the coherent resonance width under the transition of ^87Rb Fg = 1 → Fe = 0 is observed and the qualitative explanation about its mechanism is presented. Multiple subnatural width dips are obtained with a linearly polarized laser beam for the transitions of ^87Rb Fg = 1→Fe = 0, 1, 2. The feature of negative and positive slope, namely dispersionlike feature, is observed in the transmitted light.     

An abnormal phenomenon in the saturated absorption spectrum of ^87Rb

A polarization-type saturated absorption spectrum set-up for {}^{87}Rb atom laser cooling and trapping has been established in our laboratory. By changing the polarization components and optical power, enhanced absorption of the transition 5S_{1/2} F=2→5P_{3/2}F′=3 was observed with other transitions and cross-over resonance staying unvaried.     

光磁共振实验测量方法研究

从理论上对光磁共振实验折常规方法进行了分析,讨论了常规方法中影响测量精度的因素,提出了借助示波器及指南针调节扫描场幅度的改进措施。改进后的实验可以避免对水平磁场、地磁场水平分量和扫描场关系的误判。     

The experiment on the saturation polarization of Rb vapour

A cylindrical capacitor containing rubidium vapour is made. The capacitance of it at different voltages is measured under a certain Rb vapour pressure. The experimental C－V curve shows that the saturation polarization of Rb vapour is easily observed. The experiment further supports the idea that the Rb atom has a large permanent electric dipole moment.     

成人男性发中超微量元素与体质量的关联性

研究的主要目的在探讨成人男性发中超微量元素与身体质量指数,以及年龄的相关性。总共55位男性参与此项研究。受试者依据身体质量指数区分为三个族群:正常体质量组、过重组、与肥胖组。采检受试者头枕部毛发,利用ICP-MS测量超微量元素的含量,包括金、银、镓、锗、镧、铂、铷、锑、铊、钨、锆。研究结果显示,(1)发中铷、锑、铊、钨、锆含量与体质量,和/或身体质量指数呈显著相关性;(2)发中镧含量与体质量、身体质量指数、与年龄呈显著相关性;(3)发中金、镓、锗、铂、与钨含量与人体计测各变数并无相关性。     

Competition between Two Six-Wave Mixing Channels in Atomic Rb Vapor

Two six-wave mixing processes are achieved simultaneously in rubidium vapor and two channels are identified. Signal competition between the two channels is observed and phase matching conditions are analyzed for the two channels. The results show that the two six-wave mixing channels correspond to two parametric processes with weak coupling and, moreover, quantum interference and phase matching conditions primarily govern the signal competition.     

Ultranarrow bandwidth tunable atomic filter via quantum interference-induced polarization rotation in Rb vapor

We report the experimental demonstration of an ultranarrow bandwidth atomic filter by optically induced polarization rotation in multilevel electromagnetically induced transparency systems in hot Rb vapor. With a coupling intensity of 2.3 W/cm^2, the filter shows a peak transmission of 33.2% and a bandwidth of 10 MHz. By altering the coupling frequency, a broad tuning range of several Doppler linewidths of the D1 line transitions of STRb atoms can be obtained. The presented atomic filter has useful features of ultranarrow bandwidth, and the operating frequency can be tuned resonance with the atomic transition. Such narrowband tunable atomic filter can be used as an efficient noise rejection tool in classical and quantum optical applications.     

高精度（10^-15）可搬运铷原子喷泉钟的研制

原子喷泉钟是目前世界上最准的运行原子钟,主要包括铯喷泉钟和铷喷泉钟两种.中国科学院上海光学精密机械研究所于2003年开始开展了可搬运小型喷泉铷钟样机的研制,它的主要特点是：以铷原子做工作介质、损耗低、信噪比高、冷原子碰撞频移低;通过折叠光路设计,其对激光的功率要求降低2/3,系统更加紧凑稳定,更加有利于喷泉钟的工程化.该原子钟已经获得了微波跃迁的Ramsey干涉条纹,其信噪比约100,并实现了闭环锁定,1s的稳定度为8×10？13,4×104s稳定度优于6×10？15.目前正在进行误差的评估工作及系统的改进,近期将进行项目验收,预期总的频率不确定度优于4×10？15.