基于硫化物和碲酸盐光纤的成栅及应用基础研究

发布时间：2018-03-13 20:02

本文选题：光纤布喇格光栅　切入点：衍射光场　出处：《合肥工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：光纤布喇格光栅(Fiber Bragg Grating,FBG)在光纤通信和光纤传感等领域有着广泛的应用前景。与普通传感器相比,基于FBG的传感器具有体积小和精度高等优势。另外,与传统的谐振腔相比,基于FBG的谐振腔实现了光纤激光器的全光纤集成化,其稳定准确的选频特性提高了激光器输出稳定性,并提高了输出功率和效率。本文分析了基于相位掩模法刻写FBG的衍射光场,为实验刻写FBG提供理论指导。在此基础上分析了软玻璃光纤中(硫化物和碲酸盐光纤)刻写的中红外波段FBG对温度、应变以及压力的敏感特性,并将FBG作为中红外波段喇曼光纤激光器谐振腔进行数值模拟,实现喇曼激光器参数的优化设计。本文主要研究内容如下:一、建立相位模板写入FBG的物理模型,利用有限元算法对其进行分析,通过改变光源类型(平面波和球面波)、入射方向以及模板刻槽深度等参数对相位模板的衍射光场进行分析比较,得出了不同条件下相位模板的衍射图样和刻写FBG的最佳条件。二、根据布喇格公式,分析比较了基于硫化物和碲酸盐光纤的Bragg光栅等中红外FBG的温度、应变以及压力敏感特性,数值模拟了Bragg波长随温度、应变和压力变化的特性曲线,分析了FBG在中红外传感应用的基本特性以及FBG传感器的优势。三、基于受激喇曼散射的耦合传输方程,结合有限元算法和打靶法分析硫化物光纤喇曼激光器和碲酸盐光纤喇曼激光器中Stokes光以及泵浦光的特性。通过数值模拟,直观地分析了泵浦功率、光纤长度以及输出端Bragg光栅的反射率对激光器输出性能的影响,分别给出了一阶和二阶中红外光纤喇曼激光器的优化设计参数。
[Abstract]:Fiber Bragg grating has a wide application prospect in optical fiber communication and optical fiber sensing. Compared with conventional sensors, the sensor based on FBG has the advantages of small size and high precision. In addition, compared with the traditional resonator, the fiber Bragg grating has the advantages of small size and high precision. The resonator based on FBG realizes the all-fiber integration of the fiber laser, and its stable and accurate frequency selecting characteristic improves the output stability of the fiber laser. The output power and efficiency are improved. In this paper, the diffraction field of FBG based on phase mask method is analyzed. On the basis of this, the sensitivity of FBG in soft glass fiber (sulfide and tellurite fiber) to temperature, strain and pressure is analyzed. FBG is used as the resonator of medium infrared Raman fiber laser to realize the optimization design of Raman laser parameters. The main contents of this paper are as follows: first, the physical model of writing phase template into FBG is established. The diffraction light field of the phase template is analyzed and compared by changing the type of light source (plane wave and spherical wave, incident direction and groove depth of the template, etc.). The diffraction patterns of phase templates and the optimum conditions for writing FBG are obtained. Secondly, according to Bragg formula, the temperature, strain and pressure sensitivity of Bragg gratings based on sulfide and tellurite fiber are analyzed and compared. The characteristic curves of Bragg wavelength varying with temperature, strain and pressure are numerically simulated. The basic characteristics of FBG in mid-infrared sensing and the advantages of FBG sensor are analyzed. Thirdly, based on the coupled transfer equation of stimulated Raman scattering, The characteristics of Stokes light and pump light in sulfide fiber Raman laser and tellurite fiber Raman laser are analyzed by means of finite element method and shooting method. The pump power is analyzed intuitively by numerical simulation. The effects of fiber length and reflectivity of output Bragg gratings on the output performance of the laser are discussed. The optimal design parameters of the first and second order medium-infrared fiber Raman lasers are given respectively.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN253

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