高光学深度下的存储光和EIT
Stored light and EIT at high optical depths
摘要:
我们报告的EIT和存储光在高光学深度制度的初步实验研究。特别是,我们描述了两种方法来减轻辐射陷阱,在高原子密度的退相干机制:氮气作为缓冲气体,和一个长,窄的细胞几何形状。初步结果表明,这两种方法在尽量减少辐射陷阱的承诺,但也揭示了问题,如光泵到被困的最终状态。我们还观察到在高光学深度的EIT线形失真,四波混频干扰的结果。实验结果与理论预测定性一致。
英文摘要:
We report a preliminary experimental study of EIT and stored light in the high optical depth regime. In particular, we characterize two ways to mitigate radiation trapping, a decoherence mechanism at high atomic density: nitrogen as buffer gas, and a long, narrow cell geometry. Initial results show the promise of both approaches in minimizing radiation trapping, but also reveal problems such as optical pumping into trapped end-states. We also observe distortion in EIT lineshapes at high optical depth, a result of interference from four-wave mixing. Experimental results are in good qualitative agreement with theoretical predictions.
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