基于自发辐射相干实现光学前驱动场

巴诺; 王磊; 王海华; 李东飞; 王丹; 严立云

doi:10.7498/aps.65.104201

摘要

研究一个具有两个靠得足够近激发能级的双Lambda模型, 在矩形脉冲中分离出光学前驱动场. 当耦合场是大失谐时, 该原子系统在自发辐射相干效应的影响下产生一个透明窗口并伴随着陡峭的色散曲线. 因此, 由于透明窗口中的慢光效应可以使光学前驱动场从主脉冲场中分离出来. 另外, 我们通过调控脉冲波形序列研究探测场相位和幅值的累积光学前驱动波. 数值结果表明: 由于累积光前驱动场与脉冲主场的相长干涉大大地提高瞬态脉冲的能量.

关键词:

Abstract

Optical precursors were first studied by Sommerfield and Brillouin in 1914 to resolve the apparent contradictions between fast light propagation and the theory of relativity. They showed theoretically that the front edge of a step-modulated pulse does not interact with the medium and always travels at c because the dispersive material has a finite response time to the optical pulse. The past experimental studies of precursors in classical pulse propagation were always focused on an opaque medium with single or multiple Lorentz absorption lines. In these cases, the precursor signal cannot be separated from the main pulse or otherwise the main field is absorbed. However, the electromagnetically induced transparency (EIT) technique was successfully used to separate precursors from the main pulse due to the slow-light effect in cold atoms. The EIT refers to the absorption suppression or elimination of a probe field through atomic coherence in a certain medium dressed by a strong coupling field. In this paper, a four-level double-lambda atomic system with two upper states coupled to the excited state is explored to separate optical precursors from a square-modulated laser pulse with the effect of spontaneously generated coherence (SGC). The SGC effect occurs in the process of spontaneous emission, in which the atom decays from closely placed upper levels to a single ground level. The quantum interference between the decay channels takes place, which leads to decay induced transparency, thus enhancing the Kerr nonlinearity and amplification without inversion. With the assistance of spontaneously generated coherence, an EIT window appears with steep normal dispersion when the trigger field is far from resonance. Then we can obtain the optical precursors which are separated from the main pulse due to the slow-light effects in the EIT window. In the absence of SGC, the main pulse is absorbed by an opaque medium with Lorentz absorptive lines, so the slow-light effect could not take place. In addition, we obtain the stacked optical precursors with the input probe field amplitude or phase modulated by designing a series of square pulses. For the amplitude modulation case, the peak power reaches about 4.5 times that of the input pulse. With the phase modulation we obtain a transient pulse with a peak power of 14 times that of the input, as a result of constructive interference between the stacked precursors and main field. We expect these findings to be instructive in devising optical devices for optical communication, detection and medical imaging among other applications.

Keywords:

atomic coherence /
electromagnetically induced transparency /
spontaneously generated coherence

作者及机构信息

1.
吉林师范大学物理学院, 四平 136000;

2.
吉林大学物理学院, 相干光与原子分子光谱教育部重点实验室, 长春 130012

通信作者: 巴诺, banuo2008@163.com;wang_lei98@163.com ; 王磊, banuo2008@163.com;wang_lei98@163.com ;

基金项目: 国家自然科学基金(批准号:11247201)和吉林省教育厅十二五科学研究项目(批准号:20150215)资助的课题.

Authors and contacts

1.
Institute of Physics, Jilin Normal University, Siping 136000, China;

2.
Key Laboratory of Coherence Light, Atomic and Molecular Spectroscopy of the Ministry of Education, College of Physics, Jilin University, Changchun 130012, China

Corresponding author: Ba Nuo, banuo2008@163.com;wang_lei98@163.com ; Wang Lei, banuo2008@163.com;wang_lei98@163.com ;

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11247201) and the Twelfth Five-Year Program for Science and Technology of Department of Jilin Province, China (Grant No. 20150215).

参考文献

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[2]	Fleischhauer M, Imamoglu A, Marangos J P 2005 Rev. Mod. Phys. 77 633
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[7]	Bajcsy M, Zibrov A S, Lukin M D 2003 Nature 426 638
[8]	Longdell J J, Fraval E, Sellars M J, Manson N B 2005 Phys. Rev. Lett. 95 063601
[9]	Zhang X H, Bao Q Q, Zhang Y, Su M C, Cui C L, Wu J H 2012 Chin. Phys. B 21 054209
[10]	Yan Y, Li S J, Tian L, Wang H 2016 Acta Phys. Sin. 65 014205 (in Chinese) [闫妍, 李淑静, 田龙, 王海 2016 65 014205]
[11]	Wang X X, Sun J X, Sun Y H, Li A J, Chen Y, Zhang X J, Kang Z H, Wang L, Wang H H, Gao J Y 2015 Chin. Phys. B 24 074204
[12]	Wang L, Luo M X, Sun J X, Sun Y H, Chen Y, Wei X G, Kang Z H, Wang H H, Gao J Y 2015 Chin. Phys. B 24 064205
[13]	Menon S, Argarwal G S 1998 Phys. Rev. A 57 4014
[14]	Paspalakis E, Knight P L L 1998 Phys. Rev. Lett. 81 293
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[17]	Zhu S Y, Chan R C F, Lee C P 1995 Phys. Rev. A 52 710
[18]	Xu W H, Wu J H, Gao J Y 2004 Eur. Phys. J. D 30 137
[19]	Wan R G, Kou J, Jiang L, Jiang Y, Gao J Y 2011 Phys. Rev. A 83 033824
[20]	Ba N, Wang L, Wu X Y, Liu X J, Wang H H, Cui C L, Li A J 2013 Appl. Opt. 52 4264
[21]	Yao Y P, Zhang T Y, Kou J, Wan R G 2013 Phys. Lett. A 377 1416
[22]	Sommerfeld A 1914 Ann. Phys. 349 177
[23]	Brillouin L 1914 Ann. Phys. 349 203
[24]	Falcon E, Laroche C, Fauve S 2003 Phys. Rev. Lett. 91 064502
[25]	Jeong H, Dawes A M C, Gauthier D J 2006 Phys. Rev. Lett. 96 143901
[26]	Lynch F J, Holland R E, Hamermesh M 1960 Phy. Rev. 120 513
[27]	Pleshko P, Palocz I 1969 Phys. Rev. Lett 22 1201
[28]	Varoquaux E, Williams G A, Avenel O 1986 Phys. Rev. B 34 7617
[29]	Choi S H, sterberg U L 2004 Phys. Rev. Lett. 92 193903
[30]	Wei D, Chen J F, Loy M M T, Wong G K L, Du S W 2009 Phys. Rev. Lett. 103 093602
[31]	Chen J F, Jeong H, Feng L, Loy M M T, Wong G K L, Du S W 2010 Phys. Rev. Lett. 104 223602
[32]	Jeong H, Du S W 2009 Phys. Rev. A 79 011802
[33]	Chen J F, Wang S, Wei D, Loy M M T, Wong G K L, Du S W 2010 Phys. Rev. A 81 033844
[34]	Du S, Belthangady C, Kolchin P, Ying G Y, Harris S E 2008 Opt. Lett. 33 2149
[35]	Peng Y D, Niu Y P, Qi Y H, Yao H F, Gong S Q 2011 Phys. Rev. A 83 013812
[36]	Peng Y D, Yang A H, Li D H, Zhao X H, Jiang L, Zhang L Y 2013 J. Mod. Opt. 60 1343
[37]	Richard A, John P, Richard M 1989 J. Opt. Soc. Am. A 6 1441
[38]	Bao Q Q, Fang B, Yang X, Cui C L, Wu J H 2014 J. Opt. Soc. Am. B 31 62

施引文献

[1]	Harris S E 1997 Phys. Today 50 36
[2]	Fleischhauer M, Imamoglu A, Marangos J P 2005 Rev. Mod. Phys. 77 633
[3]	Hau L V, Harris S E, Dutton Z, Behroozi C H 1999 Nature 397 594
[4]	Turukhin A V, Sudarshanam V S, Shahriar M S, Musser J A, Ham B S, Hemmer P R 2001 Phys. Rev. Lett. 88 023602
[5]	Jiang Q C, Liu C, Liu J H, Zhang J X 2015 Acta Phys. Sin. 64 094208 (in Chinese) [姜其畅, 刘超, 刘晋宏, 张俊香 2015 64 094208]
[6]	Liu C, Dutton Z, Behroozi C H, Hau L V 2001 Nature 409 490
[7]	Bajcsy M, Zibrov A S, Lukin M D 2003 Nature 426 638
[8]	Longdell J J, Fraval E, Sellars M J, Manson N B 2005 Phys. Rev. Lett. 95 063601
[9]	Zhang X H, Bao Q Q, Zhang Y, Su M C, Cui C L, Wu J H 2012 Chin. Phys. B 21 054209
[10]	Yan Y, Li S J, Tian L, Wang H 2016 Acta Phys. Sin. 65 014205 (in Chinese) [闫妍, 李淑静, 田龙, 王海 2016 65 014205]
[11]	Wang X X, Sun J X, Sun Y H, Li A J, Chen Y, Zhang X J, Kang Z H, Wang L, Wang H H, Gao J Y 2015 Chin. Phys. B 24 074204
[12]	Wang L, Luo M X, Sun J X, Sun Y H, Chen Y, Wei X G, Kang Z H, Wang H H, Gao J Y 2015 Chin. Phys. B 24 064205
[13]	Menon S, Argarwal G S 1998 Phys. Rev. A 57 4014
[14]	Paspalakis E, Knight P L L 1998 Phys. Rev. Lett. 81 293
[15]	Wu J H, Gao J Y 2002 Phys. Rev. A 65 063807
[16]	Zhang B, Liu Z X, Xu W C 2013 Acta Phys. Sin. 62 164207 (in Chinese) [张冰, 刘志学, 徐万超 2013 62 164207]
[17]	Zhu S Y, Chan R C F, Lee C P 1995 Phys. Rev. A 52 710
[18]	Xu W H, Wu J H, Gao J Y 2004 Eur. Phys. J. D 30 137
[19]	Wan R G, Kou J, Jiang L, Jiang Y, Gao J Y 2011 Phys. Rev. A 83 033824
[20]	Ba N, Wang L, Wu X Y, Liu X J, Wang H H, Cui C L, Li A J 2013 Appl. Opt. 52 4264
[21]	Yao Y P, Zhang T Y, Kou J, Wan R G 2013 Phys. Lett. A 377 1416
[22]	Sommerfeld A 1914 Ann. Phys. 349 177
[23]	Brillouin L 1914 Ann. Phys. 349 203
[24]	Falcon E, Laroche C, Fauve S 2003 Phys. Rev. Lett. 91 064502
[25]	Jeong H, Dawes A M C, Gauthier D J 2006 Phys. Rev. Lett. 96 143901
[26]	Lynch F J, Holland R E, Hamermesh M 1960 Phy. Rev. 120 513
[27]	Pleshko P, Palocz I 1969 Phys. Rev. Lett 22 1201
[28]	Varoquaux E, Williams G A, Avenel O 1986 Phys. Rev. B 34 7617
[29]	Choi S H, sterberg U L 2004 Phys. Rev. Lett. 92 193903
[30]	Wei D, Chen J F, Loy M M T, Wong G K L, Du S W 2009 Phys. Rev. Lett. 103 093602
[31]	Chen J F, Jeong H, Feng L, Loy M M T, Wong G K L, Du S W 2010 Phys. Rev. Lett. 104 223602
[32]	Jeong H, Du S W 2009 Phys. Rev. A 79 011802
[33]	Chen J F, Wang S, Wei D, Loy M M T, Wong G K L, Du S W 2010 Phys. Rev. A 81 033844
[34]	Du S, Belthangady C, Kolchin P, Ying G Y, Harris S E 2008 Opt. Lett. 33 2149
[35]	Peng Y D, Niu Y P, Qi Y H, Yao H F, Gong S Q 2011 Phys. Rev. A 83 013812
[36]	Peng Y D, Yang A H, Li D H, Zhao X H, Jiang L, Zhang L Y 2013 J. Mod. Opt. 60 1343
[37]	Richard A, John P, Richard M 1989 J. Opt. Soc. Am. A 6 1441
[38]	Bao Q Q, Fang B, Yang X, Cui C L, Wu J H 2014 J. Opt. Soc. Am. B 31 62

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