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目前的相干布居囚禁(CPT)原子钟和CPT磁场计中普遍采用圆偏振光方案 (σ+-σ+)实现CPT共振, 该方案对原子的利用率较低. 为了提高原子的利用率, 本文实验研究了通过平行线偏振相干双色光与87Rb原子作用实现CPT共振的方案(lin//lin). 与σ+-σ+方案相比较, lin//lin方案消除了极化暗态, 获得更多工作原子. 在相同的实验条件下, 开展对比实验研究获得了信噪比为σ+-σ+方案2倍, 微分线型信号的中心斜率为σ+-σ+方案1.65倍的CPT共振信号. 研究结果表明该方案是实现低功耗原子钟、磁场计等设备的理想候选.Coherent population trapping (CPT) atomic clocks are prevailingly realized by exciting CPT resonance with circularly polarized bichromatic coherent light (σ+-σ+ scheme), while atom utilization efficiency is relatively low in the scheme. For improving efficiency, we experimentally study the scheme of realizing CPT resonance through the interaction between atoms and parallel linearly polarized bichromatic coherent light field (lin//lin scheme). In the same experimental conditions the experimental results show that the signal-noise ratio of the CPT resonance signal is twice, and the differential slope is 1.65 time higher than those of σ+-σ+ scheme. The experimental results reveal that the scheme is an ideal candidate for low power consuming atomic clock and magnetometer.
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Keywords:
- coherent population trapping /
- atomic clock /
- microwave /
- laser
[1] Vanier J 2005 Appl. Phys. B 81 421
[2] Deng J L, Hu Z F, He H J, Wang Y Z 2006 Chin. Phys. Lett. 23 1745
[3] Jau Y Y, Miron E, Post A B, Kuzma N N, Happer W 2004 Phys. Rev. Lett. 93 160802
[4] Liu G B, Du R C, Liu C Y, Gu S H 2008 Chin. Phys. Lett. 25 472
[5] Shah V, Knappe S, Hollberg L, Kitching J 2007 Opt. Lett. 32 1244
[6] Merimaa M, Lindvall T, Tittonen I, Ikonen E 2003 J. Opt. Soc. Am. B 20 273
[7] Liu L, Guo T, Deng K, Liu X Y, Chen X Z, Wang Z 2007 Chin. Phys. Lett. 24 1883
[8] Du R C, Chen J H, Liu C Y, Gu S H 2009 Acta Phys. Sin. 58 6117(in Chinese) [杜润昌, 陈杰华, 刘朝阳, 顾思洪 2009 58 6117]
[9] Du R C, Liu G B, Chen J H, Wang J, Liu C Y, Gu S H 2008 Spectroscopy and Spectral Analysis 28 1697 (in Chinese) [杜润昌, 刘国宾, 陈杰华, 王瑾, 刘朝阳, 顾思洪 2008 光谱学与光谱分析 28 1697]
[10] Chen J H, Du R C, Zhao J C, Li Y Y,Ma H, Liu C Y, Gu S H 2010 Acta Metr. Sin. 31 417 (in Chinese) [陈杰华, 杜润昌, 赵劼成, 黎英云, 马洪, 刘朝阳, 顾思洪 2010 计量学报 31 417]
[11] Liu G B, Gu S H 2010 J. Phys. B 43 035004
[12] Kargapoltsev S V, Kitching J, Hollberg L, Taichenachev A V, Velichansky V L, Yudin V I 2004 Laser Phys. Lett. 1 495
[13] Zanon T, Guerandel S, de Clercq E, Holleville D, Dimarcq N, Clairon A 2005 Phys. Rev. Lett. 94 193002
[14] Taichenachev A V, Yudin V I, Velichansky V L, Zibrov S A 2005 JETP Lett. 82 398
[15] Levi F, Godone A, Vanier J, Micalizio S, Modugno G 2000 Eur. Phys. J. D 12 53
[16] Watabe K, Ikegami T, Takamizawa A, Yanagimachi S, Ohshima S, Knappe S 2009 Appl. Opt. 48 1098
[17] Wang Y Q, Wang Q J, Fu J S, Dong T Q 1986 (Beijing: Sciences Press) p236 (in Chinese) [王义遒, 王庆吉, 傅济时, 董太乾 1986 量子频标原理 (北京: 科学出版社) 第236页]
[18] Agap’ev B D, Gornyi M B, Matisov B G, Rozhdestvensky Y V 1993 Phys. Usp. 36 763
[19] Mikhailov E E, Travis Horrom, Nathan Belcher, Irina Novikova 2010 J. Opt. Soc. Am. B 27 417
[20] Knappe S, Schwindt P D D, Shah V, Hollberg L, Kitching J, Liew L , Moreland J 2005 Optics Express 13 1249
[21] Lutwak R 2009 IEEE Int. Frequency Control Symp. and EFTF Conf. 573
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[1] Vanier J 2005 Appl. Phys. B 81 421
[2] Deng J L, Hu Z F, He H J, Wang Y Z 2006 Chin. Phys. Lett. 23 1745
[3] Jau Y Y, Miron E, Post A B, Kuzma N N, Happer W 2004 Phys. Rev. Lett. 93 160802
[4] Liu G B, Du R C, Liu C Y, Gu S H 2008 Chin. Phys. Lett. 25 472
[5] Shah V, Knappe S, Hollberg L, Kitching J 2007 Opt. Lett. 32 1244
[6] Merimaa M, Lindvall T, Tittonen I, Ikonen E 2003 J. Opt. Soc. Am. B 20 273
[7] Liu L, Guo T, Deng K, Liu X Y, Chen X Z, Wang Z 2007 Chin. Phys. Lett. 24 1883
[8] Du R C, Chen J H, Liu C Y, Gu S H 2009 Acta Phys. Sin. 58 6117(in Chinese) [杜润昌, 陈杰华, 刘朝阳, 顾思洪 2009 58 6117]
[9] Du R C, Liu G B, Chen J H, Wang J, Liu C Y, Gu S H 2008 Spectroscopy and Spectral Analysis 28 1697 (in Chinese) [杜润昌, 刘国宾, 陈杰华, 王瑾, 刘朝阳, 顾思洪 2008 光谱学与光谱分析 28 1697]
[10] Chen J H, Du R C, Zhao J C, Li Y Y,Ma H, Liu C Y, Gu S H 2010 Acta Metr. Sin. 31 417 (in Chinese) [陈杰华, 杜润昌, 赵劼成, 黎英云, 马洪, 刘朝阳, 顾思洪 2010 计量学报 31 417]
[11] Liu G B, Gu S H 2010 J. Phys. B 43 035004
[12] Kargapoltsev S V, Kitching J, Hollberg L, Taichenachev A V, Velichansky V L, Yudin V I 2004 Laser Phys. Lett. 1 495
[13] Zanon T, Guerandel S, de Clercq E, Holleville D, Dimarcq N, Clairon A 2005 Phys. Rev. Lett. 94 193002
[14] Taichenachev A V, Yudin V I, Velichansky V L, Zibrov S A 2005 JETP Lett. 82 398
[15] Levi F, Godone A, Vanier J, Micalizio S, Modugno G 2000 Eur. Phys. J. D 12 53
[16] Watabe K, Ikegami T, Takamizawa A, Yanagimachi S, Ohshima S, Knappe S 2009 Appl. Opt. 48 1098
[17] Wang Y Q, Wang Q J, Fu J S, Dong T Q 1986 (Beijing: Sciences Press) p236 (in Chinese) [王义遒, 王庆吉, 傅济时, 董太乾 1986 量子频标原理 (北京: 科学出版社) 第236页]
[18] Agap’ev B D, Gornyi M B, Matisov B G, Rozhdestvensky Y V 1993 Phys. Usp. 36 763
[19] Mikhailov E E, Travis Horrom, Nathan Belcher, Irina Novikova 2010 J. Opt. Soc. Am. B 27 417
[20] Knappe S, Schwindt P D D, Shah V, Hollberg L, Kitching J, Liew L , Moreland J 2005 Optics Express 13 1249
[21] Lutwak R 2009 IEEE Int. Frequency Control Symp. and EFTF Conf. 573
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