窄线宽短脉冲光纤激光器受激布里渊散射的动力学特性研究

项目名称： 窄线宽短脉冲光纤激光器受激布里渊散射的动力学特性研究

项目编号： No.11274386

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 周朴

作者单位： 中国人民解放军国防科学技术大学

项目金额： 84万元

中文摘要： 窄线宽光纤激光器具有时间相干性好和光束质量高的优点，在地球科学、原子分子物理、频率变换、光束合成等领域有广泛的应用前景。受限于SBS效应，窄线宽掺镱光纤放大器的输出功率迟迟未能突破500W。本项目提出一种新颖的抑制SBS效应的方案，采用短脉冲激光减少SBS过程的介质响应时间，从而获得高平均功率的窄线宽光纤激光。项目建立窄线宽短脉冲光纤激光器的SBS动力学物理模型，阐明脉冲激光的时、频、空域特性对SBS效应的影响，以及Stokes光与激光产生的复杂非线性耦合对输出激光时、频、空域特性的影响，推演出一套完整的用以指导高平均功率窄线宽光纤激光器的设计理论，填补非线性光纤光学基础领域的研究空白。建立起高功率窄线宽短脉冲光纤激光器实验研究平台，力争在国际上首次实现窄线宽光纤激光器千瓦（以上）高功率输出。

中文关键词： 光纤激光；脉冲激光；窄线宽；受激布里渊；非线性效应

英文摘要： Due the intrinsic advantages in excellent temporal coherence and beam quality, narrow-linewidth fiber laser (NLFL) can be widely applied in the fields like earth science, atomics physics, frequency transformation, beam combination and so on. Limited by the Stimulated Brillouin Scattering effect, the maximal output power of NLFL is limited at 500 watt level for many years. We propose a novel method to suppress the SBS in NLFL. We will use narrow-linewidth fiber laser in short pulse regime to reduce the response time of gain medium for the SBS process, and high-average-power fiber laser can thus be realized. In this project, we will build the mathematical model of the dynamics of SBS in NLFL, clarify the effect of the property of the pulsed laser in time-domain, frequency domain and spatial domain on the SBS effect, and illustrate the effect of complex coupling between the laser and the stokes beam on the property of the output laser beam in time-domain, frequency domain and spatial domain. Then we will provide a theoretical design frame for the experimental study of high power NLFL, which would be a convincing complement to the modern nonlinear fiber optics scheme. Based on the theoretical study we will carry out high power test of NLFL, our aim is to realize a kilo-watt level NLFL for the first time.

英文关键词： Fiber Laser；Pulsed Laser；Narrow Linewidth；SBS；Nonlinear effects