電磁誘發透明（EIT）是一種基於量子干涉效應的非線性光學現象，廣泛應用於光學存儲、量子信息處理與頻率轉換等領域。本研究聚焦於冷原子系綜中的 V 型 EIT 效應，結合理論與實驗進行了深入探索，發現實驗觀察與半古典理論預測有良好吻合。在 V 型量子干涉效應的作用下，即使耦合光場受到共振耗散影響，探測光場仍能被有效保護，避免吸收，從而以極小損耗穿透原子系綜。這種交互作用突顯了 V 型 EIT 在冷原子系綜中實現高穿透光學傳輸的潛力。我們針對 V 型 EIT 的光譜特性與短脈衝動態進行了全面的實驗和理論分析。通過系統地改變原子系綜的光學深度、耦合光的拉比頻率以及失諧量，我們詳細研究了這些參數對介質光譜展寬與短脈衝動態的影響，並展現了 V 型 EIT 介質的寬頻光傳輸特性。此外，本研究進一步探討了 V 型 EIT 介質的高穿透與寬頻特性在基於鑽石型躍遷結構的高效量子轉頻中提升轉換效率與保持相干性的作用。

Electromagnetically Induced Transparency (EIT) is a nonlinear optical phenomenon based on quantum interference, widely applied in optical storage, quantum information processing, and frequency conversion. This study focuses on V-type EIT in cold atomic ensembles, combining theoretical analysis and experimental validation. The results demonstrate excellent agreement between experimental observations and predictions from a semiclassical theoretical model. Under the influence of V-type quantum interference, the coupling field, even when subject to resonant dissipation, effectively protects the probe field from absorption, allowing it to propagate through the atomic ensemble with minimal loss. This interaction highlights the unique potential of V-type EIT for achieving high-transmission optical propagation in cold atomic systems. We conducted a comprehensive theoretical and experimental analysis of the spectral properties and short-pulse dynamics of V-type EIT. By systematically varying key parameters, including the optical depth of the atomic ensemble, the Rabi frequency of the coupling field, and its detuning, we investigated the impact of these parameters on spectral broadening and short-pulse dynamics, demonstrating the broadband transmission characteristics of the V-type EIT medium. Furthermore, this study explores the role of the high-transmission and broadband properties of V-type EIT in enhancing conversion efficiency and preserving coherence in quantum frequency conversion systems with Diamond-type transitions.

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