用于微小型化铷原子钟的MEMS Rb-85滤光泡的研究  

Research on MEMS-Based Rb-85 Filter in Miniaturized Passive Rubidium Atomic Clock

作　　者：郭航[1] 王盛贵[1] 

机构地区：[1]厦门大学萨本栋微机电研究中心,福建厦门361005

出　　处：《传感技术学报》2009年第5期659-663,共5页Chinese Journal of Sensors and Actuators

基　　金：福建省重大科技项目前期研究项目资助(2005HZ1021);厦门大学引进人才科研启动基金资助(0000-X07191)

摘　　要：研究并提出一种分析设计Rb气泡原子钟微型Rb-85滤光泡的方法。从量子物理出发,通过为Rb灯的发射光谱引入Lorentzian线形函数,得到一个滤光泡内的光强与入射光强的关系式,其中包含了跃迁系数,频移,谱线宽度等参数,通过研究确定这些参数并最终建立一个具有高吸收效率的滤光泡的理论模型。基于这种方法,我们设计了MEMS滤光泡,Rb-87灯射出的光谱经过该滤光泡后,90%多的α线被吸收,而β线则只衰减不到3%,因此,MEMS滤光泡不仅可以大幅度减小体积与功耗,其滤光效果也更为优越。This paper presents an analysis and design of a micromachined Rb-85 filter for passive rubidium atomic clock. By introducing the Lorentzian shape functions into the derived output light intensity equation of the filter for a monochromatic light, a formula of light intensity in a filter with a light spectrum input is set up, and parameters in this formula involving transition coefficient, frequency shifts and linewidth are studied and determined. Based on these, a micromachined Rb-85 filter with high filtering performance is designed, in which more than 90% of α-line component in the light spectrum input from the Rb-87 lamp is filtered but β-line component is weakened less than 3 %. Compared the MEMS filter with the conventional filter, the MEMS filter not only reduces the size and power consumption, but also acquires the better filter effect.

关 键 词：量子物理 Rb-85滤光泡 MEMS Rb原子钟 线宽 频移 

分 类 号：O455[理学—无线电物理]