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arXiv quant-ph/0006007quant-ph
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四能级N型电磁感应透明观测方案的实验实现

Experimental implementation of a four-level N-type scheme for the observation of Electromagnetically Induced Transparency

V. M. Entin, I. I. Ryabtsev, A. E. BoguslavskiI, I. M. Beterov

摘要:

采用非简并四能级N型方案,在$^{87}$ Rb D $_{2}$线上实现了电磁感应透明(EIT)的实验观测.在实验中使用了两个独立的外腔半导体激光器的辐射,其中一个的电流被调制的频率等于激发的5P $_{3/2}$能级的超精细分裂频率。在这种情况下,除了对应于三能级$Λ$方案中的双光子拉曼共振的主EIT凹陷之外,在吸收光谱中观察到与主凹陷失谐的频率等于HF发生器的频率的附加凹陷。这些下降是由于在对应于四能级N型方案中的三光子拉曼共振的频率处介质透明度的增加。分析了发生器频率和磁场对谐振波形的影响。

英文摘要:

A nondegenerate four-level N-type scheme was experimentally implemented to observe electromagnetically induced transparency (EIT) at the $^{87}$Rb D$_{2}$ line. Radiations of two independent external-cavity semiconductor lasers were used in the experiment, the current of one of them being modulated at a frequency equal to the hyperfine-splitting frequency of the excited 5P$_{3/2}$ level. In this case, apart from the main EIT dip corresponding to the two-photon Raman resonance in a three-level $Λ$-scheme, additional dips detuned from the main dip by a frequency equal to the frequency of the HF generator were observed in the absorption spectrum. These dips were due to an increase in the medium transparency at frequencies corresponding to the three-photon Raman resonances in four-level N-type schemes. The resonance shapes are analyzed as functions of generator frequency and magnetic field.

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