本文選題：硫系玻璃　切入點：光波導　出處：《寧波大學》2017年碩士論文　論文類型：學位論文

【摘要】：近年來,有著一系列獨特光學特性的硫系玻璃,如由于較高的折射率而具有的良好的光場限制作用,較高的非線性折射率,較寬的紅外透過窗口(可以達到20mm)和在通信波段可以忽略的雙光子吸收以及自由載流子吸收,逐漸成為了制作平面光學波導的理想材料,在現代集成中紅外光學器件研發(fā)領域具有極大的發(fā)展前景。現在許多全光進程已經采用有色散工程的硫系光波導,其中包括參數放大,波長轉換,頻分復用,超連續(xù)譜的產生等。因此,硫系玻璃在諸多領域有著十分廣闊的應用前景和研究意義。色散控制作為硫系光波導的本質屬性,在非線性過程中起著重要作用,因為對于許多非線性應用,如超連續(xù)譜的產生,四波混頻(FWM),波長轉換,參量放大,孤子裂變等需要平坦的低的色散曲線。在寬波長范圍內低的平坦色散可以用于優(yōu)化相位匹配,這對許多非線性處理是有益的。然而,硫系材料在近紅外和中紅外通常有大的負的材料色散,需要特別的波導結構設計,用波導色散來補償材料色散。我們可以通過靈活調控波導的相關參數的方法來獲得超寬帶平坦色散曲線。本文主要圍繞硫系玻璃材料展開課題的研究,并以此為基質從理論和仿真兩個方面深入分析硫系光波導的特性,文章的組成結構如下:第一章緒論簡要概述了光波導及其在非線性方面的效應,并且分析了硫系光波導的應用,介紹了硫系玻璃材料在光學方面的獨特的性能特征,然后結合硫系材料的特性說明了本文的研究內容和意義。第二章介紹了光波導基本理論,并利用經典麥克斯韋方程組,通過推導得到滿足光波傳輸的波動方程。并進一步分析了光脈沖傳輸的傳輸方程,通過進一步的學習推算出了廣義非線性薛定諤方程。最后還介紹了分析光波導時需要的邊界條件。第三章主要介紹了基于硫系材料的兩種類型的光波導,通過有限差分的方法研究了硫系光波導色散特性和有效面積,并分析了其非線性系數。在參數優(yōu)化的基礎上,獲得平坦的低的色散曲線。最后分析了在簡并四波混頻過程中的相位匹配條件。第四章在第三章的基礎上,我們設計了一種新穎的脊形硫系玻璃波導(As_2S_3)結構,這種波導結構可以同時用于基本準TE和準TM模式。對于TE和TM模,通過色散調制的方法獲得了具有兩個ZDW的超寬帶和低的色散曲線。此外,我們計算了兩種模式的有效面積和非線性系數,并研究了在這種波導結構下超短脈沖泵浦時輸出超連續(xù)譜的輸出特性。第五章是對本文研究工作內容的總結,并指出了研究工作的缺陷及尚未解決的問題。
[Abstract]:In recent years, sulfur glasses with a series of unique optical properties, such as good light field limiting action due to their high refractive index, high nonlinear refractive index, The wide infrared transmission window (up to 20mm) and the negligible two-photon absorption and free carrier absorption in the communication band have gradually become the ideal materials for the fabrication of planar optical waveguides. In the field of modern integrated infrared optical devices, there is a great development prospect. Nowadays, many optical processes have adopted sulfur optical waveguides with dispersive engineering, including parameter amplification, wavelength conversion, frequency division multiplexing, etc. Therefore, sulfur glass has a broad application prospect and research significance in many fields. As the essential property of sulfur optical waveguide, dispersion control plays an important role in the nonlinear process. For many nonlinear applications, such as the generation of supercontinuum spectrum, FWM, wavelength conversion, parametric amplification, soliton fission and so on, flat low dispersion curves are required. Low flat dispersion can be used to optimize phase matching in a wide wavelength range. This is useful for many nonlinear processing. However, sulfur materials usually have large negative material dispersion in near infrared and middle infrared, requiring special waveguide structure design. Using waveguide dispersion to compensate material dispersion. We can obtain UWB flat dispersion curve by adjusting the relevant parameters of waveguide flexibly. The characteristics of sulfur optical waveguide are analyzed theoretically and numerically. The structure of the paper is as follows: chapter one is a brief introduction to the optical waveguide and its nonlinear effect. The application of sulfur optical waveguide is analyzed, and the unique optical properties of sulfur glass are introduced. Then, the research content and significance of this paper are illustrated with the characteristics of sulfur system. In chapter 2, the basic theory of optical waveguide is introduced. By using the classical Maxwell equations, the wave equation satisfying the light wave propagation is derived, and the transmission equation of the optical pulse transmission is further analyzed. The generalized nonlinear Schrodinger equation is derived by further study. Finally, the boundary conditions required for the analysis of optical waveguides are introduced. In chapter 3, two types of optical waveguides based on sulfur materials are introduced. The dispersion characteristics and effective area of sulfur optical waveguide are studied by finite difference method, and its nonlinear coefficient is analyzed. A flat low dispersion curve is obtained. Finally, the phase matching conditions in the degenerate four-wave mixing process are analyzed. In Chapter 4th, on the basis of Chapter 3, we design a novel structure of as _ 2s _ 3s _ 3 for a ridge sulfur glass waveguide. This waveguide structure can be used in both quasi-te and quasi-TM modes. For te and TM modes, UWB with two ZDW and low dispersion curves are obtained by dispersion modulation. We have calculated the effective area and nonlinear coefficients of the two modes, and studied the output characteristics of the supercontinuum spectrum when pumped by ultrashort pulses in this waveguide structure. Chapter 5th is a summary of the work in this paper. The defects of the research work and the unsolved problems are pointed out.
【學位授予單位】：寧波大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN252

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