摘要
用抗共模干扰的激光拍频法使激光器频率不稳定引起的拍频误差减小到Δνν＜２×１０－２０。用外差移频技术实现周期的细分，再辅以微机存贮技术使频率差分辨率达到１×１０－４Ｈｚ。实验检验双向平均光速各向同性达到Δｃｃ＜１×１０－１８的精度。这一实验结果比国外最高的检验精度Δｃｃ≤２．
By means of the common mode restraint technique the error caused by the frequency instability of laser has been decreased to the level of 2×10 -20 in Δ ν/ν .By means of the heterodyne frequency shift technique and the computer storage technique the sensitivity of beat frequency achieved 1×10 -4 Hz.In our experiment the isotropy of two way speed of light has been proved at the level of 1×10 -18 in Δ / ,which represents a 2500 fold improvement on the previous best measurement given by Brillet and Hall.
出处
《北京大学学报（自然科学版）》
CAS
CSCD
北大核心
1997年第5期595-599,共5页
Acta Scientiarum Naturalium Universitatis Pekinensis
基金
国家自然科学基金
关键词
双向平均光速
抗共模干扰
激光拍频
各向同性
two way speed of light
common mode restraint of laser beat frequency
heterodyne frequency shift
