脉冲光抽运原子钟原子相位反馈研究
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摘要
在基于Ramsey作用的原子钟里,受限于原子的相干时间及晶振的相位噪声,自由演化时间不能太长。提出了大失谐光无破坏测量方法,利用该方法获取了原子相位数据,并将其反馈到微波相位上,从而实现了原子相位反馈,有效地延长了自由演化时间。分别从理论和实验上验证了这种周期性反馈作用的可行性。
In the atomic clocks based on the Ramsey process,the free evolution time cannot be very long which is limited by the coherent time of atoms and the phase noise of crystal oscillation.The non-destruction detection method with a large-detuning light is proposed.The atom phase data are obtained with this method and fed back to the microwave phase,which contributes to the realization of the atomic phase feedback and the effective prolonging of the free evolution time.The feasibility of such a periodical feedback is verified by the theory and experiment,respectively.
In the atomic clocks based on the Ramsey process,the free evolution time cannot be very long which is limited by the coherent time of atoms and the phase noise of crystal oscillation.The non-destruction detection method with a large-detuning light is proposed.The atom phase data are obtained with this method and fed back to the microwave phase,which contributes to the realization of the atomic phase feedback and the effective prolonging of the free evolution time.The feasibility of such a periodical feedback is verified by the theory and experiment,respectively.
引文
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[2]Forman P.Atomichron:The atomic clock from concept to commercial product[C].Proceedings of 1985IEEEInternational Conference,1985,73(7):1181-1204.
[3]Alley C O.Quantum electronics[M].New York:Columbia University Press,1960.
[4]Godone A,Micalizio S,Levi F.Pulsed optically pumped frequency standard[J].Physical Review A,2004,70(2):023409.
[5]Dong G X,Deng J L,Lin J D,et al.Recent improvements on the pulsed optically pumped rubidium clock at SIOM[J].Chinese Optics Letters,2017,15(4):040201.
[6]Kasevich M A,Riis E,Chu S,et al.RF spectroscopy in an atomic fountain[J].Physical Review Letters,1989,63:612-615.
[7]Dick G J,Prestage J D,Greenhall C A,et al.Local oscillator induced degradation of medium-term stability in passive atomic frequency standards[C].The 22nd Annual Precise Time and Time Interval Applications and Planning Meeting,1990:487-508.
[8]Biedermann G W,Takase K,Wu X,et al.Zero-dead-time operation of interleaved atomic clocks[J].Physical Review Letters,2013,111(17):170802.
[9]Liu P,Meng Y L,Wan J Y,et al.A new scheme of compact cold atom clock based on diffuse laser cooling in a cylindrical cavity[J].Physical Review A,2015,92(6):062101.
[10]Chou C W,Hume D B,Koelemeij J C J,et al.Frequency comparison of two high-accuracy Al+optical clocks[J].Physical Review Letters,2010,104(7):070802.
[11]Shiga N,Takeuchi M.Locking local oscillator phase to the atomic phase via weak measurement[J].New Journal of Physics,2012,14(2):023034.
[12]Kohlhaas R,Bertoldi A,Cantin E,etal.Phase locking a clock oscillator to a coherent atomic ensemble[J].Physical Review X,2015,5(2):021011.
[13]Liu Peng,Cheng Huadong,Meng Yanling,et al.Research on phase modulation of Ramsey fringes in integrating sphere cold atom clocks[J].Chinese J Lasers,2016,43(11):1112001.刘鹏,成华东,孟艳玲,等.积分球冷原子钟相位调制Ramsey条纹研究[J].中国激光,2016,43(11):1112001.
[14]林锦达,邓见辽,董功勋,等.微波相位调制锁定原子钟:CN201410698258.3[P].2014-11-27.
[15]Lin J D,Deng J L,Ma Y S,et al.Detection of ultrahigh resonance contrast in vapor-cell atomic clocks[J].Optics Letters,2012,37(24):5036-5038.
[16]Yu D S,Chen J B.Laser theory with finite atom-field interacting time[J].Physical Review A,2008,78(1):013846.
[17]Chen J B.Active optical clock[J].Chinese Science Bulletin,2009,54(3):348-352.
[18]Kazakov G A,Schumm T.Active optical frequency standard using sequential coupling of atomic ensembles[J].Physical Review A,2013,87(1):013821.