基于光子晶体光纤的高功率窄线宽光纤放大器中受激布里渊散射的抑制机理和实验研究

项目名称： 基于光子晶体光纤的高功率窄线宽光纤放大器中受激布里渊散射的抑制机理和实验研究

项目编号： No.61307054

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 王潜

作者单位： 北京工业大学

项目金额： 28万元

中文摘要： 高功率、线宽MHz-kHz量级的2微米光纤放大器在相干探测、激光遥感等应用中有迫切需求，限制其输出功率的主要因素是窄线宽激光在光纤中的受激布里渊散射(SBS)。近年出现的大模场面积光子晶体光纤(Large Mode Area Photonic Crystal Fiber, LMA PCF)具有很好的光模式操控性，具有大模场面积以抑制SBS同时保持单模传输，适合高功率光纤放大器应用,目前其SBS抑制机理没有深入的定量研究。本项目研究LMA PCF抑制SBS的机理，建立LMA PCF中的声波模型，数值求解声波模并计算SBS阈值。为了进一步提高SBS阈值，研究紫外曝光LMA PCF的声波模和SBS阈值。基于LMA PCF进行2微米波段、线宽MHz量级的光纤放大器高功率输出实验以验证分析方法和结果。本研究为窄线宽光纤放大器的功率提升提供新方法，为相干激光雷达、激光大气遥感等应用的光源研究奠定基础。

中文关键词： 光纤放大器；光纤激光器；光子晶体光纤；拉曼激光器；

英文摘要： With the widely-spread applications in coherent laser radar and laser remote sensing, an urgent demand for high power fiber lasers and amplifiers with MHz-kHz linewidth at 2 μm wavelength appears. For a narrow linewidth fiber amplifier, the current limit of output power is the stimulated Brillouin scattering (SBS) effect. In recent years, the development in photonic crystal fibers (PCF) brings new impetus to the field of fiber lasers. A large mode area (LMA) PCF can be designed to increase the SBS threshold. In this project, we study the role of LMA PCF in suppressing the SBS and find effective ways to increase the output power of narrow-linewidth mid-infrared fiber laser. Acoustic model of a LMA PCF will be established and the finite element method will be applied to calculate the SBS threshold. To further increase the SBS threshold, a model based on a piecewise UV exposed PCF will be proposed to adjust the acoustic mode and the corresponding SBS threshold will be calculated. Based on the analytical results, experimental work will be carried out with the aim of achieving a high power fiber amplifier with 2 MHz linewidth at 2μm. Increasing the output power of narrow linewidth fiber amplifier should meet the demand for applications in coherent laser radar and laser remote sensing. This work will also expand the r

英文关键词： fiber amplifier；fiber laser；photonic-crystal fiber；Raman laser；