本論文探討探測光與耦合光皆為π偏振的電磁波引發透明。在冷銣原子的三能階系
統中，若探測光與耦合光皆為π偏振時，會因耦合光有個暗態導致穿透率很低，我
們利用一右旋的幫浦光把居量趕到單一黎曼能階上，可使得穿透率有顯著的提升。
為了觀測都卜勒效應對穿透率的影響，使探測光與耦合光夾90度，並利用實驗得到
的基態同調破壞率推算出冷原子的溫度約為260 μK。

We report experimental observation of electromagnetically induced transparency (EIT) that both probe and coupling fields are π-polarized. The probe field will be absorbed strongly based on the Λ-EIT scheme of cold atomic ensemble of 87Rb due to the absence of the coupling field at one of Zeeman state. We use a pumping light to avoid this problem and restore the high transmission property of EIT. In order to observe the relation with the Doppler effect and transmission, we set the angle of the probe and coupling beams for 90 degrees, and infer the temperature of cold atomic ensemble is approximately 260 μK.

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