基于新型瑞利散射效应的多波长窄线宽光纤激光器机理研究

项目名称： 基于新型瑞利散射效应的多波长窄线宽光纤激光器机理研究

项目编号： No.61205046

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 杨彦甫

作者单位： 哈尔滨工业大学

项目金额： 26万元

中文摘要： 本项目以相干光通信、测量与传感、微波/THz波领域对多波长窄线宽光源的需求为立项背景，基于光纤介质上新型瑞利散射效应，提出并研究适合在多波长条件下取得kHz量级窄线宽的关键机理及技术。 1)瑞利散射的线宽压窄机理：①将MHz量级线宽的多波长光注入光纤，在超窄瑞利增益的作用下线宽被压窄至kHz量级，②主要研究光纤介质下瑞利散射增益带宽压窄的内在机理、光分布反馈下的瑞利受激散射模型、多波长条件下线宽压窄性能。 2)瑞利散射的选模机理：①把瑞利散射选模机理引入多波长光纤激光器中，取得单纵模工作及窄线宽性能。②主要研究瑞利窄带增益抑制边模的机理、分布式多重瑞利散射特性与建模、选模机理与增益竞争抑制协同工作特性。 本项目特色在于瑞利散射新机理、基于该机理的多波长但不限于双波长的kHz线宽光纤激光器方案、及该方案在相关领域内的潜在应用前景。

中文关键词： 光纤激光器；瑞利散射；布里渊散射；线宽压窄；多波长窄线宽

英文摘要： This project is proposed based on the practical requirements on multi-wavelength narrow-linewidth laser sources in various fields, including coherent optical communications, optical measurements and sensing, the generatino of microwave or Terahertz wave et al. In the project, the new Rayleigh scattering will be employed as the foundation of two key mechanisms to achieve the narrow linewidth for multiple wavelength lasers simultaneously. 1). The first one is the linewidth narrowing process based on ultr-narrow gain bandwidth of stimulated Rayleigh scattering (STRS) process on the fiber. ①.The basic operation principle is as follows: The multiwavelength light sources with MHz-level linewidth are amplified and then injected into the proper fiber medium.With the STRS's linewidth narrowing effect, the linewidth is compressed to kHz-level. ②. The involved research contents include: the physical mechanisum of STRS's narrow gain bandwidth; the modeling and characteristics analysis of STRS under distributed feedback; the performance study of linewith narrowing under multiwavelength input. 2). The other is the mode selection mechanism based on Rayleigh scattering effect. ①. With the rayleigh-based mode selection mechanism applied in multi-wavelength fiber laser, the single-longitudinal-mode and the consequent linewidth

英文关键词： fiber laser；Rayleigh scattering；Brillouin scattering；linewidht compression；multi-wavelength narrow linewidth