| ATOMIC AND MOLECULAR PHYSICS |
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Precision Frequency Measurement of $^{87}$Rb 5$S_{1/2}$ ($F=2$)$\to$5$D_{5/2}$ ($F''=4$) Two-Photon Transition through a Fiber-Based Optical Frequency Comb |
| Wei Xia1,2, Shao-Yang Dai1, Yin Zhang1, Kun-Qian Li1, Qi Yu1, Xu-Zong Chen1** |
1Institute of Quantum Electronics, School of Electronics Engineering and Computer Sciences, Peking University, Beijing 100871
2Jiangsu Key Laboratory on Opto-electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210046
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| Cite this article: |
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Wei Xia, Shao-Yang Dai, Yin Zhang et al 2016 Chin. Phys. Lett. 33 053201 |
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Abstract The absolute frequency of $^{87}$Rb 5$S_{1/2}$ ($F=2$)$\to$5$D_{5/2}$ ($F''=4$) two-photon transition at 778 nm is measured in an accuracy of 44 kHz. A home-made erbium-doped fiber laser frequency comb with frequency stability of $5.0\times10^{-13}$@1 s is employed for the light source. By using a periodically poled lithium niobate, the femtosecond pulse operating in 1556 nm is frequency-doubled to 778 nm to obtain the direct two-photon transition spectroscopy of thermal rubidium vapor. Through sweeping the carrier envelope offset frequency ($f_{\rm ceo}$), the 5$S_{1/2}$ ($F=2$)$\to $5$D_{5/2}$ ($F''=4$) two-photon transition line is clearly resolved and its absolute frequency is determined via the peak-finding of the fitting curve. After the frequency correction, the measured result agrees well with the previous experiment on this transition. The entire system configuration is compact and robust, providing a potential candidate of optical frequency standard for telecommunication applications.
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Received: 04 January 2016
Published: 31 May 2016
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| PACS: |
32.10.Fn
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(Fine and hyperfine structure)
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32.30.Jc
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(Visible and ultraviolet spectra)
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32.70.Jz
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(Line shapes, widths, and shifts)
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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