本文選題：非線性光學(xué) + 光學(xué)諧振腔�。� 參考：《華東理工大學(xué)》2017年碩士論文

【摘要】：自1960年第一臺紅寶石激光器被發(fā)明,非線性光學(xué),作為一門新興學(xué)科進入大家的視野。越來越多的光學(xué)現(xiàn)象要依賴于非線性光學(xué)進行解釋,諸如光學(xué)整流、高次諧波的產(chǎn)生、光學(xué)混頻、受激拉曼散射、自聚焦、光壓縮態(tài)等。這無不加快了非線性光學(xué)的發(fā)展速度。此外非線性激光光譜技術(shù)、光學(xué)雙穩(wěn)態(tài)效應(yīng)等一批新技術(shù)也隨之而來。作為一種重要的量子相干效應(yīng),電磁誘導(dǎo)透明效應(yīng),自發(fā)現(xiàn)以來,吸引了無數(shù)科研工作者。其獨特的吸收和色散特質(zhì),在眾多物理過程中扮演著重要的角色。此外,其在光速減慢領(lǐng)域的應(yīng)用,逐步刷新著人們的認(rèn)知。同時,該現(xiàn)象在全光開光、光子阻塞、機械振子等方面有著重要的應(yīng)用前景。因為電磁誘導(dǎo)透明效應(yīng)的存在,使得弱光條件下的非線性增強成為可能。各種非線性增強方案被廣泛提出。如何獲得較高階的非線性系數(shù),以及怎樣可以在小吸收甚至弱吸收的條件下得到非線性增強,成為了研究的熱點。本文采用密度矩陣方法對A型三能級系統(tǒng)的原子相干現(xiàn)象進行理論分析,并對有無原子相干條件下的五階非線性系數(shù)進行對比,數(shù)值模擬結(jié)果表明原子相干可以起到高階非線性增強的作用。在實驗上,我們自行搭建實驗平臺,構(gòu)建三能級電磁誘導(dǎo)透明系統(tǒng)。采用腔透射譜法對該系統(tǒng)的五階非線性系數(shù)進行測量,并通過計算不對稱度的方法得到五階非線性系數(shù),所得結(jié)果與理論計算具有良好的一致性。此外,我們提出了一種在零吸收情況下的非線性增強系統(tǒng)。采用密度矩陣對該五能級系統(tǒng)與四個光場的相互作用過程進行數(shù)值模擬。計算結(jié)果表明,通過調(diào)試控制場強度、失諧等相關(guān)參量,可以得到較大的三階非線性色散,并且此時線性吸收為零。本研究將對高階非線性系數(shù)、設(shè)計非線性光開關(guān)等研究提供有意義參考。
[Abstract]:Since the first ruby laser was invented in 1960, nonlinear optics has come into view as a new subject. More and more optical phenomena are explained by nonlinear optics, such as optical rectification, generation of high-order harmonics, optical mixing, stimulated Raman scattering, self-focusing, light squeezing and so on. This accelerates the development of nonlinear optics. In addition, some new techniques, such as nonlinear laser spectroscopy and optical bistable effect, have followed. As an important quantum coherence effect, electromagnetic induced transparency effect has attracted numerous researchers since it was discovered. Its unique absorption and dispersion characteristics play an important role in many physical processes. In addition, its application in the field of slowing the speed of light gradually refreshes people's cognition. At the same time, this phenomenon has an important application prospect in all optical light, photon blocking, mechanical oscillator and so on. Because of the existence of electromagnetically induced transparency, it is possible to enhance the nonlinearity in the condition of weak light. Various nonlinear enhancement schemes have been widely proposed. How to obtain higher order nonlinear coefficients and how to obtain nonlinear enhancement under the condition of small absorption or even weak absorption has become a hot research topic. In this paper, the density matrix method is used to analyze the atomic coherence phenomena in the A-type three-level system, and the fifth order nonlinear coefficients are compared under the condition of whether there is atomic coherence or not. The numerical simulation results show that atomic coherence can play a higher order nonlinear enhancement role. In the experiment, we built our own experimental platform to construct a three-level electromagnetic induced transparency system. The fifth order nonlinear coefficient of the system is measured by cavity transmission spectrum method, and the fifth order nonlinear coefficient is obtained by calculating the asymmetry degree. The results are in good agreement with the theoretical calculation. In addition, we propose a nonlinear enhancement system with zero absorption. The interaction process between the five level system and four light fields is numerically simulated by density matrix. The results show that the third-order nonlinear dispersion can be obtained by adjusting the control field intensity, detuning and other related parameters, and the linear absorption is zero. This study will provide a useful reference for the study of high order nonlinear coefficients and the design of nonlinear optical switches.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O437

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