面向CPT铷原子钟频率合成器优化  

Optimization for CPT Rb atomic clock frequency synthesizer

作　　者：牟仕浩 张开放 郭京 罗云霞 华尔天 闫树斌 Mou Shihao;Zhang Kaifang;Guo Jing;Luo Yunxia;Hua Ertian;Yan Shubin(North university of China,School of instruments and electronics,Taiyuan 030051;Zhejiang University of Water Resources and Electric Power,College of Electrical Engineering,Hangzhou 310000;North university of China,School of electical and control engineering,Taiyuan 030051)

机构地区：[1]中北大学仪器与电子学院,太原030051 [2]浙江水利水电学院电气工程学院,杭州310000 [3]中北大学电气与控制工程学院,太原030051

出　　处：《现代科学仪器》2020年第1期19-24,共6页Modern Scientific Instruments

基　　金：科技部国家重点研发计划(2017YFB0503200)资助;山西省“1331工程”重点学科建设计划资助、国家自然科学基金(61675185)资助;山西省新兴产业领军人才资助。

摘　　要：采用锁相环频率合成技术产生3.417GHz微波频率并对其优化,相位噪声为-104.75dBc/Hz@100kHz,将优化后的锁相环频率合成器加载到VCSEL(Vertical Cavity Surface Emitting Laser垂直腔面发射激光器)上对驱动电流进行幅度调制,使VCSEL产生具有特定光频差的高度相干双色光,测试原子对±1级边带的多普勒吸收峰,通过改变微波信号的功率从-10dBm到+8dBm,测试在不同温度下改变微波功率对多普勒吸收峰的影响,找到对应工作温度下最佳的微波功率使得铷原子对±1级边带吸收峰最大,测得温度在64℃、65℃、66℃时,最佳微波功率分别为-3dBm、-1dBm、3dBm,为后续CPT(Coherent Population Trapping相干布局囚禁)信号测试奠定基础。The phase-locked loop(PLL)frequency synthesis technology was used to generate 3.417GHz microwave frequency and optimize it,the phase noise is-104.75 dBc/Hz@100 KHz.It is loaded on VCSEL to modulate the laser drive current producing a highly coherent light with specific frequency,testing the Doppler absorption peak of the±1 sidebands of the atoms.By changing the power of microwave signal from-10dbm to+8dBm,the influence of changing microwave power on Doppler absorption peak at different temperatures was tested,and the optimal microwave power at corresponding temperature was found to maximize the±1 sideband peak of rubidium atoms.The optimal microwave power was-3dBm,-1dBm and 3dBm when the temperature was 64℃,65℃and 66℃,laying a foundation for the subsequent CPT signal.

关 键 词：CPT原子钟 微波功率 多普勒吸收峰 锁相环 

分 类 号：TN2[电子电信—物理电子学]