基于相位掩模法的高阶铌酸锂Bragg波导光栅的研究

发布时间：2018-04-14 19:24

本文选题：LiNbO_3波导 + 高阶Bragg波导光栅　；参考：《天津理工大学》2017年硕士论文

【摘要】：近些年来,LiNbO_3晶体由于其热稳定性好,可见光波段光折变敏感,被广泛用作光集成器件的基底材料。LiNbO_3波导的制备技术已相当成熟,在LiNbO_3波导上制备的Bragg波导光栅也成为最重要的集成器件之一。本文在Ti扩散LiNbO_3波导的基础上,对高阶均匀,p相移及线性啁啾Bragg波导光栅的性能进行了研究,并利用相位掩模技术在Ti扩散铌酸锂波导上进行二阶均匀及线性啁啾Bragg波导光栅写制实验的研究。具体工作内容如下:1、对高阶均匀Bragg波导光栅的性能进行了研究,分析了饱和系数,光栅阶数对高阶均匀Bragg波导光栅反射谱的影响。在最优饱和系数下,不同阶均匀Bragg波导光栅最大反射率及零值带宽均达到最高,并且光栅阶数越大,零值带宽越小,但是最大反射率相等。2、对高阶p相移Bragg波导光栅的性能进行了研究,分析了相移位置,饱和系数和光栅阶数对奇数阶p相移Bragg波导光栅反射谱的影响。其中相移点在光栅中间位置时,各阶p相移Bragg波导光栅性能最好。在最优饱和系数下,不同阶p相移Bragg波导光栅的双通带间隔,谐振峰及分裂点的反射率最大,并且光栅阶数越大,双通带间隔越小,但是谐振峰及分裂点的反射率相等。3、对高阶线性啁啾Bragg波导光栅的性能进行了研究,主要从饱和系数,光栅阶数两方面研究对高阶线性啁啾Bragg波导光栅反射谱的影响。在最优饱和系数下,不同阶最大反射率达到最高,并且光栅阶数越大,啁啾系数,全反射带宽及最大反射率越小。4、对相位掩模法刻写高阶Bragg波导光栅的实验进行了研究。设计了相位掩模法刻写二阶均匀及线性啁啾Bragg波导光栅的实验方案,并分析了不同的实验参量对波导光栅性能的影响,进行了实验刻写,并对造成实验测量结果的可能原因进行了分析。
[Abstract]:In recent years, due to its good thermal stability, visible light band photorefractive sensitivity, LiNbO _ 3 crystal has been widely used as a substrate material for optical integrated devices. The fabrication technology of Linbo _ 3 waveguide has been quite mature.Bragg waveguide gratings fabricated on LiNbO_3 waveguides have also become one of the most important integrated devices.On the basis of Ti diffused LiNbO_3 waveguides, the performance of high order uniform phase shift and linearly chirped Bragg waveguide gratings is studied in this paper.The second order uniform and linearly chirped Bragg waveguide writing experiments were carried out on Ti diffused lithium niobate waveguide using phase mask technique.The main work is as follows: 1. The performance of high order uniform Bragg waveguide grating is studied, and the effects of saturation coefficient and grating order on the reflection spectrum of high order uniform Bragg waveguide grating are analyzed.Under the optimal saturation coefficient, the maximum reflectivity and zero bandwidth of Bragg waveguide gratings with different order are the highest, and the larger the grating order is, the smaller the zero bandwidth is.But the maximum reflectivity is equal. 2. The performance of high order p-phase-shifted Bragg waveguide gratings is studied, and the effects of phase shift position, saturation coefficient and grating order on the reflection spectrum of odd-order p-phase-shifted Bragg waveguide gratings are analyzed.When the phase shift point is in the middle of the grating, the performance of the p-phase shift Bragg waveguide grating is the best.Under the optimal saturation coefficient, the double pass band interval, resonance peak and splitting point reflectivity of Bragg waveguide gratings with different order p phase shift are the largest, and the larger the grating order, the smaller the double pass band interval.But the reflectivity of resonance peak and splitting point is equal. 3. The performance of high order linearly chirped Bragg waveguide grating is studied. The influence of saturation coefficient and grating order on the reflection spectrum of high order linearly chirped Bragg waveguide grating is studied.Under the optimal saturation coefficient, the maximum reflectivity of different order reaches the highest, and the larger the order of grating, the smaller the chirp coefficient, the total reflection bandwidth and the maximum reflectivity. 4. The experiment of writing high order Bragg waveguide grating by phase mask method is studied.An experimental scheme of second-order homogeneous and linearly chirped Bragg waveguide gratings with phase mask method is designed. The effects of different experimental parameters on the performance of waveguide gratings are analyzed.The possible causes of the experimental results are analyzed.
【学位授予单位】：天津理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN25

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