A diode laser spectrometer at 634nm and absolute frequency measurements using optical frequency comb |
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| Authors: | Yi Lin Yuan Jie Qi Xiang-Hui Chen Wen-Lan Zhou Da-Wei Zhou Tong Zhou Xiao-Ji and Chen Xu-Zong |
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| Affiliation: | School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China |
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| 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. |
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| Keywords: | frequency standard optical
frequency comb absolute frequency measurement atomic clock |
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