Abstract This paper reports that two identical external-cavity-diode-laser (ECDL) based spectrometers are constructed at 634 nm referencing on the hyperfine B-X transition R(80)8-4 of 127I2. The lasers are stabilized on the Doppler-free absorption signals using the third-harmonic detection technique. The instability of the stabilized laser is measured to be 2.8×10-12 (after 1000 s) by counting the beat note between the two lasers. The absolute optical frequency of the transition is, for the first time, determined to be 472851936189.5 kHz by using an optical frequency comb referenced on the microwave caesium atomic clock. The uncertainty of the measurement is less than 4.9 kHz.
Received: 13 August 2008
Revised: 10 September 2008
Accepted manuscript online:
Fund: Project supported by the National
Fundamental Research Program of China (Grant Nos 2005CB3724500 and
2006CB921400), the Major Program of National Natural Science
Foundation of China (Grant No 60490280), National Natural Science
Foundation of China (Grant
Cite this article:
Yi Lin(伊林), Yuan Jie(袁杰), Qi Xiang-Hui(齐向晖), Chen Wen-Lan(陈文兰), Zhou Da-Wei(周大伟), Zhou Tong(周通), Zhou Xiao-Ji(周小计), and Chen Xu-Zong(陈徐宗) A diode laser spectrometer at 634nm and absolute frequency measurements using optical frequency comb 2009 Chin. Phys. B 18 1409
[1]
Effective sideband cooling in an ytterbium optical lattice clock Jin-Qi Wang(王进起), Ang Zhang(张昂), Cong-Cong Tian(田聪聪), Ni Yin(殷妮), Qiang Zhu(朱强), Bing Wang(王兵), Zhuan-Xian Xiong(熊转贤), Ling-Xiang He(贺凌翔), and Bao-Long Lv(吕宝龙). Chin. Phys. B, 2022, 31(9): 090601.
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
