磁光控制原子介质对慢光的偏转
Deflection of Slow Light by Magneto-Optically Controlled Atomic Media
摘要：
本文提出了一种在非均匀磁场或非均匀控制激光中，由相干$Λ$型三能级原子介质引起的光偏转的半经典理论。当原子能级（或控制激光的拉比耦合）由于非均匀磁场（或控制场分布的非均匀性）的塞曼效应而具有位置依赖性时，当电磁感应透明发生以避免介质吸收时，原子介质的折射率的空间依赖性将导致慢信号光的可观察偏转。基于几何光学中的费马原理，我们的理论方法不仅对最近的实验给出了一个简单的一致的解释，而且预言了非均匀非共振控制激光场中原子介质对慢信号光偏转的新效应。
英文摘要：
We present a semi-classical theory for light deflection by a coherent $Λ$-type three-level atomic medium in an inhomogeneous magnetic field or an inhomogeneous control laser. When the atomic energy levels (or the Rabi coupling by the control laser) are position-dependent due to the Zeeman effect by the inhomogeneous magnetic field (or the inhomogeneity of the control field profile), the spatial dependence of the refraction index of the atomic medium will result in an observable deflection of slow signal light when the electromagnetically induced transparency happens to avoid medium absorption. Our theoretical approach based on Fermat's principle in geometrical optics not only provides a consistent explanation for the most recent experiment in a straightforward way, but also predicts the new effects for the slow signal light deflection by the atomic media in an inhomogeneous off-resonant control laser field.
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