無鏡式電磁誘發光放大器;Mirror-free light amplifier by using electromagnetically induced resonance cavity

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题名:	無鏡式電磁誘發光放大器;Mirror-free light amplifier by using electromagnetically induced resonance cavity
作者:	陳冠宇;Chen, Kuan-Yu
贡献者:	物理學系
关键词:	電磁誘發透明;靜止脈衝;量子光學;Electromagnetically induced transparency;Stationary light;Quantum optics
日期:	2020-07-23
上传时间:	2020-09-02 15:47:22 (UTC+8)
出版者:	國立中央大學
摘要:	電磁誘發透明(Electromagnetically Induced Transparency，以下簡稱EIT)是一種光與原子之間量子交互作用下使得介質變得透明的現象。EIT介質的非線性光學性質促成了慢光現象甚至是靜止脈衝(Stationary light)的研究。在靜止脈衝中儲存光的特性使得量子記憶體的發展成為了可能。而慢光效應也為非線性光學帶來了更多發展性。在此篇論文中，我們利用雙Λ型EIT系統設計出一種光放大器。透過兩道對向傳播的Couple光，我們可以製造往雙方向傳播的Probe光，這種機制可被類比為EIT型的鏡子。在引入非同調性泵浦雷射以製造增益介質後，將EIT鏡子置於增益介質兩邊形成EIT共振腔。有別於傳統利用鏡子形成的共振腔，這種全光學共振腔可藉由調整外加雷射的參數來控制共振腔的各種性質。最後，透過將Couple光的連續脈衝串打入EIT共振腔內，我們可以設計出可調製的光梳雷射。此光梳雷射的脈衝重複率(repetition rate)可藉由控制Couple光脈衝之間的時間間距來調整，而偏移頻率(offset frequency)可藉由控制原子基態的能階偏移來達到平移頻譜中峰值位置的效果。;Electromagnetically induced transparency (EIT) is a quantum mechanism that makes optical medium become transparent due to the quantum interaction between atoms and lights. The nonlinearity of EIT medium results in the discoveries of extremely slow light and stationary light pulse. Localized the light in medium reveals the capability of making quantum memories. The slow group velocity and high transparency of EIT enable new approaches for nonlinear optics. In this thesis we theoretically investigate the double-Λ type EIT for designing a light amplifier. By using two counterpropagating couple beams, the forward and backward probe light can be generated, which can be treated as EIT mirror. We make an EIT cavity whose gain medium is prepared by incoherent pumping laser, where the light can be amplified between two EIT mirrors. Compared with conventional laser cavity which is composed of mirrors, this all-optical cavity can be modified by the external lasers. Finally, we demonstrate an approach of producing a comb laser, where the offset frequency can be modified by the shift of the ground-state energy level, and the repetition rate can be adjusted by the time interval between couple light pulses.
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