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Optimization of the light-induced-fluorescence signals of single atoms and efficient loading of single atoms into a magneto-optical trap

Wang Jie-Ying Liu Bei Diao Wen-Ting Jin Gang He Jun Wang Jun-Min

Optimization of the light-induced-fluorescence signals of single atoms and efficient loading of single atoms into a magneto-optical trap

Wang Jie-Ying, Liu Bei, Diao Wen-Ting, Jin Gang, He Jun, Wang Jun-Min
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  • In our experiment, firstly, we carry out the loading of single atoms in the magneto-optical trap (MOT) by increasing the quadrupole magnetic field gradient, improving the background vacuum, and reducing the diameters of the cooling and trapping laser beams. Secondly, we get the single atomic fluorescence signal of a high signal-to-background ratio in the MOT by means of reducing the detuning of cooling light and increasing its intensity appropriately, and using the polarization spectroscopy locking technique to suppress the fluctuations of cooling laser. In addition, with the real-time feedback on quadrupole magnetic field gradient, we demonstrate a probability of loading single atoms in the MOT as high as 98%. We also measure the statistical properties of the single atomic fluorescence which is excited by continuous light in the MOT; the measured second-order correlation is g(2)( = 0) = 0.09.
    • Funds: project supported by the National Basic Research Program of China (Grant No. 2012CB921601), the National Natural Science Foundation of China (Grant Nos. 11274213, 61205215, 61227902), the National Natural Science Foundation of Innovative Research Group Project (Grant No. 61121064), the Shanxi Scholarship Council of China (Grant No. 2012-015), and the Research Program for Sci Tech Star of Taiyuan, Shanxi Province, China (Grant No. 12024707).
    [1]

    Hu Z, Kimble H J 1994 Opt. Lett. 19 1888

    [2]

    Ruschewitz F, Bettermann D, Peng J L, Ertmer W 1996 Europhys. Lett. 34 651

    [3]

    Haubrich D, Schadwinkel H, Strauch F, Ueberholz B, Wynands R, Meschede D 1996 Europhys. Lett. 34 663

    [4]

    Willems P A, Boyd R A, Bliss J L, Libbrecht K G 1997 Phys. Rev. Lett. 78 1660

    [5]

    Hilland S B, McClelland J J 2003 Appl. Phys. Lett. 82 3128

    [6]

    Yoon S, Choi Y, Park S, Kim J, Lee J H, An K 2006 Appl. Phys. Lett. 88 211104

    [7]

    Wang J, He J, Qiu Y, Yang B D, Zhao J Y, Zhang T C, Wang J M 2008 Chin. Phys. B 17 2062

    [8]

    He J, Yang B D, Zhang T C, Wang J M 2011 J. Phys. D: Appl. Phys. 44 135102

    [9]

    He J, Yang B D, Zhang T C, Wang J M 2011 Chin. Phys. B 20 073701

    [10]

    He J 2011 Ph. D. Thesis (Shanxi: Shanxi University) (in Chinese) [何军 2011 博士学位论文(山西:山西大学)]

    [11]

    Thompson J D, Tiecke T G, Zibrov A S, Vuletic V, Lukin M D 2013 Phys. Rev. Lett. 110 133001

    [12]

    Haubrich D, Hope A, Meschede D 1993 Opt. Commun. 102 225

    [13]

    Foot C J 2005 Atomic Physics (Oxford: Clarendon Press) 180-181

    [14]

    Carmichael H J, Walls D F 1976 J. Phys. B: At. Mol. Phys. 9 1199

  • [1]

    Hu Z, Kimble H J 1994 Opt. Lett. 19 1888

    [2]

    Ruschewitz F, Bettermann D, Peng J L, Ertmer W 1996 Europhys. Lett. 34 651

    [3]

    Haubrich D, Schadwinkel H, Strauch F, Ueberholz B, Wynands R, Meschede D 1996 Europhys. Lett. 34 663

    [4]

    Willems P A, Boyd R A, Bliss J L, Libbrecht K G 1997 Phys. Rev. Lett. 78 1660

    [5]

    Hilland S B, McClelland J J 2003 Appl. Phys. Lett. 82 3128

    [6]

    Yoon S, Choi Y, Park S, Kim J, Lee J H, An K 2006 Appl. Phys. Lett. 88 211104

    [7]

    Wang J, He J, Qiu Y, Yang B D, Zhao J Y, Zhang T C, Wang J M 2008 Chin. Phys. B 17 2062

    [8]

    He J, Yang B D, Zhang T C, Wang J M 2011 J. Phys. D: Appl. Phys. 44 135102

    [9]

    He J, Yang B D, Zhang T C, Wang J M 2011 Chin. Phys. B 20 073701

    [10]

    He J 2011 Ph. D. Thesis (Shanxi: Shanxi University) (in Chinese) [何军 2011 博士学位论文(山西:山西大学)]

    [11]

    Thompson J D, Tiecke T G, Zibrov A S, Vuletic V, Lukin M D 2013 Phys. Rev. Lett. 110 133001

    [12]

    Haubrich D, Hope A, Meschede D 1993 Opt. Commun. 102 225

    [13]

    Foot C J 2005 Atomic Physics (Oxford: Clarendon Press) 180-181

    [14]

    Carmichael H J, Walls D F 1976 J. Phys. B: At. Mol. Phys. 9 1199

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  • Received Date:  29 October 2013
  • Accepted Date:  27 November 2013
  • Published Online:  05 March 2014

Optimization of the light-induced-fluorescence signals of single atoms and efficient loading of single atoms into a magneto-optical trap

  • 1. State Key Laboratory of Quantum Optics and Quantum Optics Devices (Shanxi University), and Institute of Opto-Electronics, Shanxi University, Taiyuan 030006
Fund Project:  project supported by the National Basic Research Program of China (Grant No. 2012CB921601), the National Natural Science Foundation of China (Grant Nos. 11274213, 61205215, 61227902), the National Natural Science Foundation of Innovative Research Group Project (Grant No. 61121064), the Shanxi Scholarship Council of China (Grant No. 2012-015), and the Research Program for Sci Tech Star of Taiyuan, Shanxi Province, China (Grant No. 12024707).

Abstract: In our experiment, firstly, we carry out the loading of single atoms in the magneto-optical trap (MOT) by increasing the quadrupole magnetic field gradient, improving the background vacuum, and reducing the diameters of the cooling and trapping laser beams. Secondly, we get the single atomic fluorescence signal of a high signal-to-background ratio in the MOT by means of reducing the detuning of cooling light and increasing its intensity appropriately, and using the polarization spectroscopy locking technique to suppress the fluctuations of cooling laser. In addition, with the real-time feedback on quadrupole magnetic field gradient, we demonstrate a probability of loading single atoms in the MOT as high as 98%. We also measure the statistical properties of the single atomic fluorescence which is excited by continuous light in the MOT; the measured second-order correlation is g(2)( = 0) = 0.09.

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