Precision frequency measurement of 1^S0–3^P1 intercombination lines of Sr isotopes

作     者：刘辉 高峰 王叶兵 田晓 任洁 卢本全 徐琴芳 谢玉林 常宏 

作者机构：CAS Key Laboratory of Time and Frequency Primary Standards National Time Service Center University of Chinese Academy of Sciences 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2015年第24卷第1期

页      面：208-215页

核心收录：

学科分类：07[理学] 070203[理学-原子与分子物理] 0702[理学-物理学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61127901) the Key Project of the Chinese Academy of Sciences(Grant No.KJZD-EW-W02) 

主　　题：optical frequency measurement strontium intercombination transition 

摘      要：We report on frequency measurement of the intercombination（5s^2）^1S0–（5s5p）^3P1transition of the four natural isotopes of strontium, including88^Sr（82.58%）,87^Sr（7.0%）,86^Sr（9.86%）, and84^Sr（0.56%）. A narrow-linewidth laser that is locked to an ultra-low expansion（ULE） optical cavity with a finesse of 12000 is evaluated at a linewidth of 200 Hz with a fractional frequency drift of 2.8×10^-13 at an integration time of 1 s. The fluorescence collector and detector are specially designed, based on a thermal atomic beam. Using a double-pass acousto-optic modulator（AOM） combined with a fiber and laser power stabilization configuration to detune the laser frequency enables high signal-to-noise ratios and precision saturated spectra to be obtained for the six transition lines, which allows us to determine the transition frequency *** optical frequency is measured using an optical frequency synthesizer referenced to an H maser. Both the statistical values and the final values, including the corrections and uncertainties, are derived for a comparison with the values given in other works.