Enhanced reflection via phase compensation from anomalous dispersion in atomic vapor
Enhanced reflection via phase compensation from anomalous dispersion in atomic vapor
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通过原子蒸气中反常色散的相位补偿增强反射
DOI：
10.1103/physreva.83.053841
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发表时间：
2011-05
影响因子：
2.9
通讯作者：
Zhu, Shi-Yao
中科院分区：
文献类型：
--
作者：
Zhang, Jun-Xiang;Zhou, Hai-Tao;Wang, Da-Wei;Zhu, Shi-Yao
研究了真空中四波矢量不匹配的三能级系统中四波混频（或光栅反射）反射过程中异常色散引起的相位补偿机制。从热铯原子电池中观察到反射信号的效率高达43%。当探测光束的频率（以及反射信号的频率）与跃迁频率发生轻微的红失谐时，最大反射发生，这归因于伴随强探测吸收的陡峭异常色散的相位补偿。研究了耦合光与探针光的夹角、耦合强度、场和原子密度对效率的影响。建立了理论模型，与实验结果吻合较好。
The phase compensation mechanism induced by anomalous dispersion in the reflection process of four-wave mixing (or reflection from a grating) in a three-level system is investigated, where the four wave vectors do not match in vacuum. An efficiency of the reflected signal of as high as 43% from a hot atomic cell of Cs is observed. The maximum reflection occurs when the frequency of the probe beam (and consequently the frequency of the reflected signal) is slightly red detuned from the transition frequency, which is attributed to the phase compensation from the steep anomalous dispersion accompanied with a strong probe absorption. The dependences of the efficiency on the angle between the coupling and probe lights, on the intensity of the coupling, field and on atomic density are studied. A theoretical model is presented and it is in good agreement with the experimental results.