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arXiv 0901.3790quant-ph
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碰撞热原子蒸气中电磁感应透明和慢光的实在论

Realistic theory of electromagnetically-induced transparency and slow light in a hot vapor of atoms undergoing collisions

Joyee Ghosh, R. Ghosh, F. Goldfarb, J. -L. Le Gouët, F. Bretenaker

摘要:

我们提出了一个现实的理论处理的三能级$Λ$系统中的热原子蒸汽与耦合和探测场的任意强度的相互作用,导致电磁感应透明和慢光下的双光子共振条件。我们考虑到所有相关的退相干过程,包括col5Blisions。在强碰撞极限下有效地模拟了变速碰撞(VCC),这有助于实现整个多普勒轮廓上的耦合光束的光泵浦。的原子密度矩阵元素的稳态表达式进行数值计算,以产生实验测量的响应特性。的预测,考虑到在两个较低的水平的$Λ$的原子流入的动态速率,是在极好的协议与报告的实验结果为$^4$他 *。VCC参数所起的作用被认为是不同的渡越时间或拉曼相干衰减率。

英文摘要:

We present a realistic theoretical treatment of a three-level $Λ$ system in a hot atomic vapor interacting with a coupling and a probe field of arbitrary strengths, leading to electromagnetically-induced transparency and slow light under the two-photon resonance condition. We take into account all the relevant decoherence processes including col5Blisions. Velocity-changing collisions (VCCs) are modeled in the strong collision limit effectively, which helps in achieving optical pumping by the coupling beam across the entire Doppler profile. The steady-state expressions for the atomic density-matrix elements are numerically evaluated to yield the experimentally measured response characteristics. The predictions, taking into account a dynamic rate of influx of atoms in the two lower levels of the $Λ$, are in excellent agreement with the reported experimental results for $^4$He*. The role played by the VCC parameter is seen to be distinct from that by the transit time or Raman coherence decay rate.

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