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研究生： 陳泳帆
Yong-Fan Chen
論文名稱： 應用慢光效應對光資訊的儲存和操控
Storage and Manipulation of Photonic Information with Slow Light Effect
指導教授： 余怡德
Ite A. Yu
口試委員:
學位類別： 博士
Doctor
系所名稱： 理學院 - 物理學系
Department of Physics
論文出版年： 2005
畢業學年度： 94
語文別： 英文
論文頁數： 82
中文關鍵詞： Electromagnetically Induced Transparency 、Slow light 、Photon switching by quantum interference 、Light storage and retrieval 、Laser cooling and trapping 、Cross phase modulation
外文關鍵詞： Electromagnetically Induced Transparency, Slow light, Photon switching by quantum interference, Light storage and retrieval, Laser cooling and trapping, Cross phase modulation
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    • This thesis reports our studies on the phenomenon of electromagnetically induced transparency (EIT) and its applications including slow light effect, low-light-level photon switching, light storage and retrieval, manipulations of optical properties of stored light pulses, and a new cross-phase modulation (XPM) scheme based on light-storage technique.

    EIT is the phenomenon that the absorption of a weak probe field is greatly reduced or even completely inhibited by the presence of a strong coupling field. We study the EIT effect in laser-cooled 87Rb atoms by measuring the EIT spectra. The experimental data are in agreement with the theoretical predictions. We also study the slow light effect with EIT. In our experiment, the group velocity of a light pulse can be greatly slowed down to around 1500 m/s or vg/c ~ 5×10-6 with the steep dispersion of EIT media.

    Photon switching system is an important application of slow light effect. We experimentally study the transient behaviors of photon switching and provide theoretical explanations to these behaviors. We also experimentally demonstrate a single-photons-density switching. The results show that the single-photons switching is feasible and may has potential applications in quantum communication and computation.

    The phenomenon of light storage and retrieval with dynamical EIT effect is based on the coherence transfer between light and collective atomic spin coherence, which can be used a quantum memory. We observe the light storage and retrieval in cold 87Rb atoms and propose a simple method of beat-note interferometer to directly demonstrate the process of light storage and retrieval is phase coherent. We also experimentally manipulate the width, frequency and polarization of retrieved light by controlling the retrieval process of light storage.

    We experimentally demonstrate a new XPM scheme based on the light-storage technique. The proposed scheme can work in pulse regime and has the same figure of merit compared to the one using the static EIT under the constant coupling field. Nevertheless, the phase shift and the energy loss of a probe pulse induced by a signal pulse are neither influenced by the coupling intensity nor by the atomic optical density in the light-storage XPM scheme. This scheme enhances the flexibility of the experiment and makes possible of a single-photons π phase gate.

    Abstract i Acknowledgment ii Table of Contents iii 1. Introduction 1 1.1 Nonlinear optics in coherent media 1 1.2 Overview 3 2. Slow light with electromagnetically induced transparency 5 2.1 Introduction 5 2.2 Laser cooling and trapping cold atoms 6 2.3 D-line transition structures of 87Rb atoms 7 2.4 Phase and group velocity 9 2.5 Slow light experiments 10 2.5.1 Experimental setup and arrangements 10 2.5.2 Timing sequences of controlling all realted fields 12 2.5.3 Experimental results and discussions 12 3. Low-light-level photon switching with slow light 15 3.1 Introduction 15 3.2 Transient behaviors of photon switching 16 3.2.1 Experimental setup and arrangements 16 3.2.2 Experimental results and discussions 18 3.2.3 Theoretical discussions 21 3.3 Single-photons-density switching 27 3.3.1 Experimental setup and arrangements 27 3.3.2 Experimental results and discussions 29 3.4 Summary 37 4. Light storage and retrieval with dynamic EIT effect 38 4.1 A brief introduction and review 38 4.2 Observation of light storage and retrieval 39 4.3 Phase coherence of light storage and retrieval 40 4.3.1 Beat-note interferometer 41 4.3.2 Experimental setup and arrangements 42 4.4 Experimental results and discussions 43 4.4.1 Phase coherence of stored and retrieved light pulses 43 4.4.2 Phase shift with EIT effect 45 4.4.3 Phase measurement of weak light pulses 46 4.5 Summary 48 5. Manipulation of photonic information via light-storage technique 49 5.1 Width manipulation of retrieved light pulses 50 5.1.1 Introduction 50 5.1.2 Experimental setup and arrangements 50 5.1.3 Experimental results and discussions 51 5.2 Frequency manipulation of retrieved light pulses 56 5.2.1 Introduction 56 5.2.2 Experimental arrangements and results 57 5.3 Polarization manipulation of retrieved light pulses 59 5.3.1 Experimental arrangements and results 59 5.3.2 Theoretical discussions for energy loss of retrieved light 61 5.4 Summary 63 6. Low-light-level Cross-phase modulation based on stored light pulses 65 6.1 Introduction 65 6.2 Theoretical discussions 66 6.3 Experimental setup and arrangements 68 6.4 Experimental results and discussions 70 6.5 Summary 73 7. Conclusions and Prospects 74 References 77

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