10^(-16)量级698 nm超稳激光  

10^(-16)Level 698 nm Ultra-stable Laser

作　　者：江晨晖 张林波[1,2] 陈龙 刘涛[1,2] 董瑞芳[1,2] 张首刚 JIANG Chenhui;ZHANG Linbo;CHEN Long;LIU Tao;DONG Ruifang;ZHANG Shougang(National Time Service Centre,Chinese Academy of Science,Xi'an 710600,China;University of Chinese Academy of Science,Beijing 100049,China)

机构地区：[1]中国科学院国家授时中心,西安710600 [2]中国科学院大学,北京100049

出　　处：《光子学报》2021年第11期39-48,共10页Acta Photonica Sinica

基　　金：国家自然科学基金委重大科研仪器设备研制专项(No.61127901);国家自然科学基金青年科学基金(No.11903041)。

摘　　要：为了实现高稳定度的锶原子光钟,设计了基于30 cm腔超稳激光系统。系统性评估并抑制了系统中存在的主要噪声,将参考腔的振动不敏感度降低到6×10^(-10)/g,对应的频率不稳定度小于3.6×10^(-16);使用真空室内控温的方法,将控温层的温度变化减小到0.4 mK以内,腔上温度起伏在1 Hz处相比实验室环境温度降低了5个数量级;功率抖动经抑制达到了1 pW,对应的频率不稳定度为2.4×10^(-19)@1 s;剩余幅度噪声、光纤相位噪声经抑制后均小于3×10^(-16),完全满足达到10^(-16)量级超稳激光的条件。与10 cm腔超稳激光系统进行拍频比对,综合拍频结果和噪声分析显示,系统锁定后激光频率不稳定度的秒稳小于6.2×10^(-16)。To achieve a highly stable strontium atomic optical clock,the ultra-stable laser system based on 30 cm cavity is desiged.Systematic evaluation and suppression of the main noise in the system is performed,so that the current vibration insensitivity of the reference cavity is reduced to 6×10^(-10)/g with the corresponding frequency instability less than 3.6×10^(-16).By using the method of temperature control in the vacuum chamber,the temperature changes is less than 0.4 mK in a day,and the temperature fluctuation of the cavity is 5 orders of magnitude lower than the laboratory environment temperature at 1 Hz.The power jitter is suppressed to 1 pW,and the corresponding frequency instability is 2.4×10^(-19)@1 s.The residual amplitude noise and fiber phase noise are less than 3×10^(-16)after being suppressed,which fully meets the requirements for ultra-stable lasers of the order of 10-16.Comparing the beat frequency with a 10 cm cavity ultra-stable laser system,comprehensive beat frequency results and noise analysis show that the stability of the laser frequency instability is less than 6.2×10^(-16)@1s after the system locked.

关 键 词：锶原子光钟 超稳激光 振动不敏感度 温度控制 功率抖动 剩余幅度噪声 光纤相位噪声 

分 类 号：O439[机械工程—光学工程]