光泵浦效应对电磁诱导透明介质极化特性的影响
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摘要
本文主要研究光泵浦效应对电磁诱导透明介质极化特性的影响。理论分析了耦合场分别与探针场同向和反向传播时,介质对探针场的色散和吸收特性。同时理论分析表明,相对二能级原子来说,由于耦合光的泵浦作用,在多普勒吸收基础上,原子对探针光的吸收增强,并且这种泵浦作用与耦合场传播方向无关。实验上验证了上述理论研究中原子介质对探针场的吸收特性。进一步地,实验研究了耦合光功率、频率失谐及粒子数密度等参量对泵浦率的影响,特别是对吸收宽度和深度的影响。
The effect of optical pumping on the susceptibillity characteristics of the electromagnetically induced transparency medium was stuied.In theory,we analysed the dispersion and absorption characteristics of the probe field,coupled with the coupling field co-and counter-propagated,respectively.At the same time,theoretical analysis showed that,with regard to the two-level atoms,the absorption of the probe light was enhanced due to the optical pumping of the coupling field,and this pumping effect was independent of the propagation direction of the coupling.The absorption characteristic of the probe field in the above theoretical analysis was verified experimentally.Further,the influence of some parameters on the pumping rate were studied,such as the coupling power,coupling frequency detuning,the particle number density and so on,especially on the absorption width and depth.
The effect of optical pumping on the susceptibillity characteristics of the electromagnetically induced transparency medium was stuied.In theory,we analysed the dispersion and absorption characteristics of the probe field,coupled with the coupling field co-and counter-propagated,respectively.At the same time,theoretical analysis showed that,with regard to the two-level atoms,the absorption of the probe light was enhanced due to the optical pumping of the coupling field,and this pumping effect was independent of the propagation direction of the coupling.The absorption characteristic of the probe field in the above theoretical analysis was verified experimentally.Further,the influence of some parameters on the pumping rate were studied,such as the coupling power,coupling frequency detuning,the particle number density and so on,especially on the absorption width and depth.
引文
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[2]HARRIS S E.Lasers without Inversion:Interference of Lifetime-broadened Resonances[J].Phys Rev Lett,1989,62:1033-1036.DOI:http:∥dx.doi.org/10.1103/PhysRevLett.62.1033.
[3]BOLLER K J,IMAMOGLU A,HARRIS S E.Observation of Electromagnetically Induced Transparency[J].Phys Rev Lett,1991,66:2593-2596.DOI:10.1103/PhysRevLett.66.2593.
[4]HAU L V,HARRIS S E,DUTTON Z,et al.Light Speed Reduction to 17 Metres per Second in an Ultracold Atomic Gas[J].Nature,1999,397:594-598.DOI:10.1038/17561.
[5]BAJCSY M,ZIBROV S A,LUKIN M D.Stationary Pulses of Light in an Atomic Medium[J].Nature,2003,426:638-641.DOI:10.1038/nature 02176.
[6]BLINOV B B,MOEHRING D L,DUAN L M,et al.Observation of Entanglement between a Single Trapped Atom and a Single Photon[J].Nature,2004,428:153-157.DOI:10.1038/nature 02377.
[7]LUKIN M D.Trapping and Manipulating Photon States in Atomic Ensembles[J].Rev of Mod Phys,2003,75:457-472.DOI:http:∥dx.doi.org/10.1103/RevMod Phys.75.457.
[8]ZHOU H T,WANG D W,WANG D,et al.Efficient Reflection Via four-wave Mixing in a Doppler-free Electromagneticallyinduced-transparency Gas[J].Phys Rev A,2011,84:053835.DOI:10.1103/PhysRevA.84.053835.
[9]YANG G Q,XU P,WANG J,et al.Four-wave Mixing in a three-level Bichromatic Electromagnetically Induced Transparency System[J].Phys Rev A,2010,82:045804.DOI:10.1103/PhysRevA.82.045804.
[10]IVAKHNIK V V,SAVELEV M V.Degenerate four-wave Mixing in Transparent Two-component Medium Considering Spatial Structure of the Pump Waves[J].J Phys,2016,737:012007.DOI:10.1103/1742-6596/737/1/D12007.
[11]ZHANG J X,ZHOU H T,WANG D W,et al.Enhanced Reflection via Phase Compensation from Anomalous Dispersion in Atomic Vapor[J].Phys Rev A,2011,83:053841.DOI:10.1103/PhysRevA.83.053841.
[12]ZHOU H T,WANG D,GUO M J,et al.Controllable Optical Mirror of Cesium Atoms with four-wave Mixing[J].Chin Phys B,2014,23:093204.DOI:10.1088/1674-1056/23/9/093204.
[13]WANG D W,ZHOU H T,Guo M J,ZHANG J X,EVERS J,and Zhu S Y.Optical Diode Made from a Moving Photonic Crystal[J].Phys Rev Lett,2013,110:093901.DOI:10.1103/PhysRevLett.110.093901.
[14]GUO M J,ZHOU H T,WANG D,et al.Experimental Investigation of High-frequency-difference Twin Beams in Hot Cesium Atoms[J].Phys Rev A,2014,89:033813.DOI:10.1103/PhysRevA.89.033813.
[15]LIU C J,Jing J T,Zhou Z F,et al.Realization of Low Frequency and Controllable Bandwidth Squeezing Based on a fourwave-mixing Amplifier in Rubidium Vapor[J].Opt Lett,2011,36:2979.DOI:10.1364/01.36.002979.
[16]GEA BANACLOCHE J,WU H B,and XIAO M.Transmission Spectrum of Doppler-broadened two-level Atoms in a Cavity in the Strong-coupling Regime[J].Phys Rev A,2008,78:023828.DOI:10.1103/PhysRevA.78.023828.
[17]YU X,XIONG D,CHEN H,et al.Multi-normal-modesplitting of a Cavity in the Presence of atoms:A step Towards the Superstrong-coupling regime[J].Phys Rev A,2009,79:061803.DOI:10.1103/PhysRevA.79.061803.
[18]HERNANDEZ G,ZHANG J P,and ZHU Y.Vacuum Rabi Splitting and Intracavity Dark State in a Cavity-atom System[J].Phys Rev A,2007,76:053814.DOI:10.1103/PhysRevA.76.053814.
[19]WU H B,GEA-BANACLOCHE J,XIAO M.Observation of Intracavity Electromagnetically Induced Transparency and Polariton Resonances in a Doppler-Broadened Medium[J].Phys Rev Lett.,2008,100:173602.DOI:10.1103/PhysRevLett.100.173602.
[20]YE C Y,ZIBROV A S.Width of the Electromagnetically Induced Transparency Resonance in Atomic Vapor[J].Phys Rev A,2002,65:023806.DOI:10.1103/Phy Rev A.65.023806.