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

doi:10.1088/1674-1056/24/1/013201

Abstract We report on frequency measurement of the intercombination (5s²)¹S₀-(5s5p)³P₁ transition of the four natural isotopes of strontium, including ⁸⁸Sr (82.58%), ⁸⁷Sr (7.0%), ⁸⁶Sr (9.86%), and ⁸⁴Sr (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 precisely. The 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.

Keywords: optical frequency measurement strontium intercombination transition

Received: 19 June 2014
Revised: 08 August 2014
Accepted manuscript online:

PACS:	32.30.Jc	(Visible and ultraviolet spectra)
	06.30.Ft	(Time and frequency)
	42.62.Fi	(Laser spectroscopy)

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

Corresponding Authors: Chang Hong
E-mail: changhong@ntsc.ac.cn

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Liu Hui (刘辉), Gao Feng (高峰), Wang Ye-Bing (王叶兵), Tian Xiao (田晓), Ren Jie (任洁), Lu Ben-Quan (卢本全), Xu Qin-Fang (徐琴芳), Xie Yu-Lin (谢玉林), Chang Hong (常宏) Precision frequency measurement of ¹S₀-³P₁ intercombination lines of Sr isotopes 2015 Chin. Phys. B 24 013201

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

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