NTSC-F1铯原子喷泉钟光频移的评定  

Evaluation of the light shift of the caesium fountain clock NTSC-F1

作　　者：张辉[1,2] 王心亮[1,2] 管勇[1,2,3] 刘丹丹 白杨[1,2] 施俊如 余凤翔 杨帆[1,2,3] 阮军 张首刚[1,2] ZHANG Hui;WANG Xin-liang;GUAN Yong;LIU Dan-dan;BAI Yang;SHI Jun-ru;YU Feng-xiang;YANG Fan;RUAN Jun;ZHANG Shou-gang(National Time Service Center,Chinese Academy of Sciences,Xi,an 710600,China;Key Laboratory of Time and Frequency Primary Standards,Chinese Academy of Sciences,Xi,an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院时间频率基准重点实验室,西安710600 [3]中国科学院大学,北京100049

出　　处：《时间频率学报》2018年第3期151-156,共6页Journal of Time and Frequency

基　　金：国家自然科学基金资助项目(61127901)

摘　　要：光频移是铯原子喷泉钟系统频移项之一。铯原子与微波Ramsey相互作用期间,近共振的冷却光、探测光、选态推光的存在都会产生原子光频移。通过控制NTSC-F1铯原子喷泉钟光学系统的AOM射频开关,以及在进入物理系统光纤前添加机械开关的方式,可以有效地降低系统的光频移。理论上对光频移影响因素进行了分析,实验上对NTSC-F1铯原子喷泉钟冷却光、探测光、选态推光分别存在的情况下的光频移值进行了测量评估,确定了NTSC-F1铯原子喷泉钟光频移项的主要来源。NTSC-F1铯原子喷泉钟光频移量为0,相对值不确定度为5.13×10^(-19)。Light shift is one of the systematic frequency shifts in Cs cooling atom fountain clock. During the Ramsey interaction between Cs atoms and microwave, the presence of near-resonant laser including cooling laser, detecting laser, state-selection pushing laser may cause light shift. It can be eventually reduced with acousto-optic modulators（AOMs） in the optical bench and mechanical shutters before laser delivering into physics package. Effect factors of the shift are analyzed in theory, each of the shift values is evaluated,and the critical source is determined. The light shift correction of NTSC-F1 Cs cooling atom fountain clock is 0,and relative uncertainty of light shift is 5.13×10^-19.

关 键 词：铯原子喷泉钟 光频移 AOM射频开关 机械开关 

分 类 号：P127.1[天文地球—天体测量] TM935.115[天文地球—天文学]