此篇論文為研究在電磁波誘發透明（Electromagnetically Induced Transparency）中產生光拖曳現象，並找出 EIT 中介質的速度變化與探測光相位變化的關係。實驗上只使用了一台雷射打出 D2-line 的光並透過調變頻率產生出耦合光與探測光，設置上免去校正耦合光與探測光相位的步驟。因為要產生足夠明顯的光拖曳現象需要較高的 EIT 效果，於是我們另外使用一台雷射加入幫浦光。在有 6% 穿透率時候進行延遲時間的測量，發現延遲時間約為 0.02μs，低於預期能產生足夠光拖曳效果，故比較了幫浦光的光強對 EIT 效果的影響。而後轉為使用 D1-line，目前已有 30% 穿透率變化，約是之前的 5 倍，也進行延遲時間量測已知有 1.3μs，估計已經足夠長可以進行光拖曳量測，之後將會著手進行相關的實驗架設。
關鍵詞：電磁波誘發透明、光拖曳。

This paper studies the phenomenon of light dragging in electromagnetically induced transparency (EIT) and finds the relation between the velocity change of the medium and the phase change of the probe beam in EIT. In the experiment, only one laser is used to generate the coupling beam and probe beam by modulating the frequency, which eliminates the need to regulate the phase of the coupling beam and probe beam. We use another laser to pump atoms to enhance the EIT transmission rate because a strong EIT effect can produce a strong enough light dragging effect. Finally, we obtained a long enough delay time to measure the light dragging effect, and we will proceed to set up and measure the light dragging.
Keywords: electromagnetically induced transparency, light dragging

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