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Search Results: 1 - 10 of 4016 matches for " electromagnetically induced transparency "
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Dependence of electromagnetically induced transparency on temperature
Xiao Feng,Guo Rui-Min,Li Lu-Ming,Yang Dong-Hai,Chen Xu-Zong,
肖峰
,郭瑞民,李路明,杨东海,陈徐宗

中国物理 B , 2004,
Abstract: We performed an experimental study on the dependence of the linewidth of electromagetically induced transparency (EIT) on the temperature of medium in a Λ-type configuration using caesium vapour. We found that the transparent window is narrowed in the EIT whose two ground levels are composed of two hyperfine levels, and broadened in the case when the two ground levels are degenerated Zeeman sublevels, as the temperature of vapour cell is increased. The explanation for the phenomena is given qualitatively.
Ultraslow optical solitons via electromagnetically induced transparency: a density-matrix approach

Luo Bin,Hang Chao,Li Hui-Jun,Huang Guo-Xiang,

中国物理 B , 2010,
Abstract: We study the ultraslow optical solitons in a resonant three-level atomic system via electromagnetically induced transparency under a density-matrix (DM) approach. The results of linear and nonlinear optical properties are compared with those obtained by using an amplitude variable (AV) approach. It is found that the results for both approaches are the same in the linear regime if the corresponding relations between the population-coherence decay rates in the DM approach and the energy-level decay rates in the AV approach are appropriately imposed. However, in the nonlinear regime there is a small difference for the self-phase modulation coefficient of the nonlinear Schr\"{o}dinger equation that governs the time evolution of probe pulse envelope. All analytical predicts are checked by numerical simulations.
Effect of concentration of Er3+ ions on ultra-large index of refraction via atomic coherence in Er3+: YAG crystal

Zhang Hui-Fang,Dai Zhen-Wen,Zhang Bing,Wu Jin-Hui,Gao Jin-Yue,

中国物理 B , 2003,
Abstract: A four-level system is proposed to produce large index of refraction accompanied by vanishing absorption in the Er^{3+}-doped yttrium aluminium garnet (YAG) crystal. It is found that the high index of refraction with zero absorption can be provided by adjusting the incoherent pumping, the coherent field, as well as the concentration of Er^{3+} ions in the crystal. Furthermore, the value of the incoherent pump to achieve the high index of refraction with zero absorption is greatly changed with increasing the concentration of Er^{3+} ions in the crystal. This indicates that the effect of concentration on the high index of refraction with zero absorption cannot be neglected.
Electromagnetically induced transparency based six-wave mixing in a Doppler-broadened folded four-level system

Niu Jin-Yan,Pei Li-Y,Wu Ling-An,Fu Pan-Ming,

中国物理 B , 2010,
Abstract: We study phase-conjugate six-wave mixing spectroscopy based on electromagnetically-induced-transparency in a Doppler-broadened folded four-level system. It is found that the six-wave mixing spectrum can be either Doppler-free or very broad, depending on whether the interference between the polarisations of atoms with different velocities is constructive or destructive. To obtain the Doppler-free six-wave mixing spectrum in the folded four-level system, the conditions are more stringent in comparison with those in the cascade and N-type four-level systems. This polarisation interference can be controlled in the presence of a strong coupling field.
Absorptive reduction and width narrowing in \Lambda-type atoms confined between two dielectric walls
Absorptive reduction and width narrowing in Λ-type atoms confined between two dielectric walls

Li Yuan-Yuan,Hou Xun,Bai Jin-Tao,Yan Jun-Feng,Gan Chen-Li,Zhang Yan-Peng,
李院院
,侯 洵,白晋涛,闫军锋,甘琛利,张彦鹏

中国物理 B , 2008,
Abstract: This paper investigates the absorptive reduction and the width narrowing of electromagnetically induced transparency (EIT) in a thin vapour film of $\Lambda $-type atoms confined between two dielectric walls whose thickness is comparable with the wavelength of the probe field. The absorptive lines of the weak probe field exhibit strong reductions and very narrow EIT dips, which mainly results from the velocity slow-down effects and transient behaviour of atoms in a confined system. It is also shown that the lines are modified by the strength of the coupling field and the ratio of $L / \lambda$, with $L$ the film thickness and $\lambda $ the wavelength of the probe field. A simple robust recipe for EIT in a thin medium is achievable in experiment.
Manipulation of multiple electromagnetically induced two-photon transparency in a six-level atomic system

Jia Wen-Zhi,Wang Shun-Jin,

中国物理 B , 2009,
Abstract: In the five-level K-type atomic system, by using another control field to couple the excited level of the coupling transition to the sixth higher excited level, a six-level atomic system is constructed. In this system, the multiple electromagnetically induced two-photon transparency has been investigated. What is more, if choosing the parameters of the control fields properly the triple transparency window will reduce to a double one which means that the multiple electromagnetically induced two-photon transparency can be manipulated in this system. The physical interpretation of these phenomena is given in terms of the dressed states and the dark states.
Enhanced or suppressed six-wave mixing in a five-level atomic system

Song Yue,Dai Guo-Xian,Fu Yu-Xin,Zhao Jin-Yan,Wang Zhi-Guo,Zhang Yan-Peng,

中国物理 B , 2011,
Abstract:
The difference in noise property between the Autlerben Townes splitting medium and the electromagnetically induced transparent medium

Li Zhong-Hu,Li Yuan,Dou Ya-Fang,Zhang Jun-Xiang,

中国物理 B , 2012,
Abstract: The quantum noise of squeezed probe light passing through an atomic system with different electromagnetically induced transparency and Autler-Townes splitting effects is investigated theoretically. It is found that the optimal squeezing preservation of the outgoing probe beam occurs in the strong-coupling-field regime rather than in the weak-coupling-field regime. In the weak-coupling-field regime, which was recently recognized as the electromagnetically induced transparency regime (Abi-Salloum T Y 2010 Phys. Rev. A bf81 053836), the output amplitude noise is affected mainly by the atomic noise originating from the random decay process of atoms. While in the strong-coupling-field regime, defined as the Autler-Townes splitting regime, the output amplitude noise is affected mainly by the phase-to-amplitude conversion noise. This is useful in improving the quality of the experiment for efficient quantum memory, and hence has an application in quantum information processing.
电磁感应透明探针光与控制光量子相干光学特性分析
Quantum Coherent Optical Properties of Probe and Control Fields in Electromagnetically Induced Transparency
 [PDF]

姜新韵, 徐子涵, 沈建其
Modern Physics (MP) , 2013, DOI: 10.12677/MP.2013.31008
Abstract: 对三能级电磁感应透明原子系统的密度矩阵方程进行解算,获得该系统九个密度矩阵元的色散行为,同时研究探针光与控制光所对应的原子气体介电系数的色散曲线和一般相干操控特性。本文将控制光与探针光同等看待,即不同于以往着重于探针光特性、将控制光仅当作调控电磁感应透明介质光学特性的外部条件看待、从而没有研究控制光本身如何受探针光的影响。本文研究探针光与控制光之间的彼此影响(即彼此受对方操控的行为)。电磁感应透明介质内由光来控制光的量子相干行为可以作为新型光子学器件设计的基本原理。
The equation of motion of the density matrix of a three-level EIT (electromagnetically induced transparency) atomic system is solved and the behavior of dispersion of the nine density matrix elements is presented. The general optical response of the electric permittivity corresponding to both the probe and the control fields is addressed based on the numerical results of the equation of motion of the density matrix. The probe and the control fields are treated in the same way, in which the influence of the probe field on the control field (and vice versa) is considered. The optical be- havior of controlling light with light can be a fundamental mechanism for new photonic and quantum optical device design.
Coherent control of negative refraction based on local-field enhancement and dynamically induced chirality

Ba Nuo,Gao Jin-Wei,Tian Xing-Xi,Wu Xi,Wu Jin-Hui,

中国物理 B , 2010,
Abstract: This paper studies the electromagnetic response of a coherently driven dense atomic ensemble to a weak probe. It finds that negative refraction with little absorption may be achieved in the presence of local-field enhanced interaction and dynamically induced chirality. The complex refractive index governing the probe refraction and absorption depends critically on the atomic density, the steady population distribution, the coherence dephasings, and the frequency detunings, and is also sensitive to the phase of the driving field because the photonic transition paths form a close loop. Thus, it can periodically tune the refractive index at a fixed frequency from negative to positive values and vice versa just by modulating the driving phase. Moreover, the optimal negative refraction is found to be near the probe magnetic resonance, which then requires the electric fields of the probe and the drive being on two-photon resonance due to the dipole synchronisation.
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