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Chin. Phys. B, 2021, Vol. 30(7): 074203    DOI: 10.1088/1674-1056/abf91b

Spectral filtering of dual lasers with a high-finesse length-tunable cavity for rubidium atom Rydberg excitation

Yang-Yang Liu(刘杨洋)1,2, Zhuo Fu(付卓)1,2, Peng Xu(许鹏)1,†, Xiao-Dong He(何晓东)1, Jin Wang(王谨)1, and Ming-Sheng Zhan(詹明生)1,‡
1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract  We propose and demonstrate an alternative method for spectral filtering and frequency stabilization of both 780-nm and 960-nm lasers using a high-finesse length-tunable cavity (HFLTC). Firstly, the length of HFLTC is stabilized to a commercial frequency reference. Then, the two lasers are locked to this HFLTC using the Pound-Drever-Hall (PDH) method which can narrow the linewidths and stabilize the frequencies of both lasers simultaneously. Finally, the transmitted lasers of HFLTC with each power up to about 100 μW, which act as seed lasers, are amplified using the injection locking method for single-atom Rydberg excitation. The linewidths of obtained lasers are narrowed to be less than 1 kHz, meanwhile the obtained lasers' phase noise around 750 kHz are suppressed about 30 dB. With the spectrally filtered lasers, we demonstrate a Rabi oscillation between the ground state and Rydberg state of single-atoms in an optical trap tweezer with a decay time of (67±37) μs, which is almost not affected by laser phase noise. We found that the maximum short-term laser frequency fluctuation of a single excitation lasers is at ~3.3 kHz and the maximum long-term laser frequency drift of a single laser is ~46 kHz during one month. Our work develops a stable and repeatable method to provide multiple laser sources of ultra-low phase noise, narrow linewidth, and excellent frequency stability, which is essential for high precision atomic experiments, such as neutral atom quantum computing, quantum simulation, quantum metrology, and so on.
Keywords:  laser frequency stabilization      spectral filtering      Rydberg state      rubidium atom  
Received:  05 April 2021      Revised:  16 April 2021      Accepted manuscript online:  19 April 2021
PACS:  42.60.Lh (Efficiency, stability, gain, and other operational parameters)  
  42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy)  
  32.80.Ee (Rydberg states)  
  03.67.Lx (Quantum computation architectures and implementations)  
Fund: Project supported by National Key Research and Development Program of China (Grant No. 2016YFA0302800), the National Natural Science Foundation of China (Grant Nos. U20A2074 and 12074391), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB 21010100), the Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2017378), and K.C. Wong Education Foundation (Grant No. GJTD-2019-15).
Corresponding Authors:  Peng Xu, Ming-Sheng Zhan     E-mail:;

Cite this article: 

Yang-Yang Liu(刘杨洋), Zhuo Fu(付卓), Peng Xu(许鹏), Xiao-Dong He(何晓东), Jin Wang(王谨), and Ming-Sheng Zhan(詹明生) Spectral filtering of dual lasers with a high-finesse length-tunable cavity for rubidium atom Rydberg excitation 2021 Chin. Phys. B 30 074203

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