电磁感应透明中Dicke窄化的测量
Measurement of Dicke Narrowing in Electromagnetically Induced Transparency
摘要：
迪克窄化是一种由于频繁的速度变化碰撞而显著减小谱线的多普勒宽度的现象。电磁感应透明（EIT）共振也会出现类似的现象，并有助于室温蒸气中的超窄光谱特征。我们通过研究EIT线形作为泵浦光和探测光之间的角度的函数来直接测量Dicke状窄化。测量结果与没有拟合参数的分析理论吻合得很好。结果表明，Dicke窄化可以显著提高热蒸汽EIT对角度偏差的容忍度。我们证明了这种效果的重要性，如成像和空间孤子的应用程序，使用单次拍摄成像实验，并讨论了在原子蒸气中存储图像的可行性的影响。
英文摘要：
Dicke narrowing is a phenomena that dramatically reduces the Doppler width of spectral lines, due to frequent velocity-changing collisions. A similar phenomena occurs for electromagnetically induced transparency (EIT) resonances, and facilitates ultra-narrow spectral features in room-temperature vapor. We directly measure the Dicke-like narrowing by studying EIT line-shapes as a function of the angle between the pump and the probe beams. The measurements are in good agreement with an analytic theory with no fit parameters. The results show that Dicke narrowing can increase substantially the tolerance of hot-vapor EIT to angular deviations. We demonstrate the importance of this effect for applications such as imaging and spatial solitons using a single-shot imaging experiment, and discuss the implications on the feasibility of storing images in atomic vapor.
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