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arXiv 1606.00736physics.optics
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法拉第效应下的同时慢光和快光

Simultaneous slow and fast light involving the Faraday effect

Bruno Macke, Bernard Ségard

发表信息：
Phys. Rev. A 94, 043801 (2016)
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摘要：

本文从理论上研究了线偏振光脉冲在平行于传播方向的静磁场中的冷原子系综中的线性传输。入射脉冲的载波频率与原子的共振频率一致。透射光的电场是横向的，在平行和垂直于入射脉冲的偏振方向上进行检查。我们给出了系统在两种极化情况下的传递函数和相应的群时延的解析表达式。我们证明了慢光可以在一个偏振态下被观察到，而快光同时在垂直偏振态下被观察到。此外，我们还指出，由于偏振后选择，系统不一定具有最小相移.在Kramers-Kronig关系的不相关应用可能导致人们期望快光的情况下，可以获得慢光。当入射光为阶跃调制时，在适当的条件下，该系统可以实现光前驱场和主场的分离。

英文摘要：

We theoretically study the linear transmission of linearly polarizedlight pulses in an ensemble of cold atoms submitted to a static magneticfield parallel to the direction of propagation. The carrier frequencyof the incident pulses coincides with a resonance frequency of theatoms. The transmitted light, the electric field of which is transversal,is examined in the polarizations parallel and perpendicular to thatof the incident pulses. We give explicit analytic expressions for thetransfer functions of the system for both polarizations and for thecorresponding group delays. We demonstrate that slow light can beobserved in a polarization, whereas fast light is simultaneously observedin the perpendicular polarization. Moreover, we point out that, dueto the polarization post selection, the system is not necessarilyminimum phase shift. Slow light can then be obtained in situationswhere an irrelevant application of the Kramers-Kronig relations could lead oneto expect fast light. When the incident light is step modulated, wefinally show that, in suitable conditions, the system enables oneto separate optical precursor and main field.

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