Cold atom space clock with counter-propagating atoms  

作　　者：吕德胜 汪斌 李唐 刘亮 

机构地区：[1]Key Laboratory of Quantum Optics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences [2]State Key Laboratory of Precision Spectroscopy,East China Normal University

出　　处：《Chinese Optics Letters》2010年第8期735-737,共3页中国光学快报（英文版）

基　　金：supported by the National"863"Program of China(No.2006AA12Z311);the National"973"Program of China(No.2005CB724506)

摘　　要：We discuss the feasibility of realizing a cold atom space clock with counter-propagating cold atoms in microgravity. The design of the space clock is based on an atomic beam clock with Ramsey cavity, except that magneto-optical trap （MOT） is placed at each side. Cold atoms are launched simultaneously from the MOTs at both sides of the clock and they move at the counter-direction towards each other. The velocity of the launched atoms is precisely controlled to Ramsauer-Townsend resonance so that no additional collision frequency shift takes place. Such configuration can efficiently cancel the frequency shift resulting from cavitv phase shift and increase the signal-to-noise ratio （SNR）.We discuss the feasibility of realizing a cold atom space clock with counter-propagating cold atoms in microgravity. The design of the space clock is based on an atomic beam clock with Ramsey cavity, except that magneto-optical trap （MOT） is placed at each side. Cold atoms are launched simultaneously from the MOTs at both sides of the clock and they move at the counter-direction towards each other. The velocity of the launched atoms is precisely controlled to Ramsauer-Townsend resonance so that no additional collision frequency shift takes place. Such configuration can efficiently cancel the frequency shift resulting from cavitv phase shift and increase the signal-to-noise ratio （SNR）.

关 键 词：Clocks Frequency shift keying Signal to noise ratio 

分 类 号：O562[理学—原子与分子物理]