项目名称： 基于同步双波长激光泵浦的石墨烯宽带波长转换中红外飞秒脉冲生成机理与实验研究

项目编号： No.61505005

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 张梦

作者单位： 北京航空航天大学

项目金额： 22万元

中文摘要： 2-5µm中红外超短脉冲激光源具有重要应用价值。利用超短脉冲激光泵浦结合非线性波长转换器件是通过非线性过程实现中红外飞秒脉冲重要途径之一。但现有研究受限于多个泵浦源之间难于同步、泵浦源峰值功率低、波长转换器件无法与光纤集成等问题，因而难以实现小型集成光源。本项目利用石墨烯具有的宽带可饱和吸收和强三阶非线性响应特性，提出通过共用石墨烯的波长可调谐高峰值功率双波长泵浦激光和全光纤石墨烯波长转换器，实现全光纤中红外波长可调谐飞秒脉冲源。拟开展的研究内容主要有：揭示共用石墨烯的双波长脉冲同步机理，实现高峰值功率全光纤双波长同步激光器；设计和研制结合微纳光纤的高非线性石墨烯波长转换器件，探索光纤器件中光波模式与石墨烯非线性作用机理；实现2.6-3.2µm间可调谐、脉冲宽度<500fs的中红外脉冲源。研究成果将有助于在光与物质作用机理等科学问题上获得新认识，也为实现小型飞秒脉冲激光源提供新思路。

中文关键词： 锁模光纤激光器；石墨烯；中红外；全光纤激光；非线性光纤光学

英文摘要： 2-5 µm mid-infrared (mid-IR) ultrashort pulsed laser sources are of great importance for many applications (including medicine, military etc). An important way to produce femtosecond pulses operating in the mid-IR region is by means of nonlinear parametric processes which include an ultrashort pulsed laser as the pump interacting nonlinearly with a frequency converter. To date, most mid-IR short pulsed laser sources produced through this approach are complex and bulky. This is due to the limitations of the pumps and converters, e.g. difficulties of the synchronization between different individual lasers, lack of wavelength conversion devices with all-fiber architectures. The focus of this proposal is to develop wavelength tunable, high-peak power synchronized fiber lasers through a common graphene saturable absorber and all-fiber integrated graphene-based broad bandwidth wavelength converters for femtosecond mid-IR pulse generation. There are three main research aspects: the establishment of the experimental and numerical studies of wavelength tunable, high peak power dual-wavelength fiber lasers, highlighting mechanisms, dynamics and outlining optimized geometries for peak power scaling; the design and development of highly nonlinear graphene-based all-fiber integrated wavelength converters that comply with a monolithic approach; and the development of a 2.6-3.2 µm wavelength tunable, short pulsed (<500 fs) mid-IR all-fiber source. We anticipate that the research outlined in this proposal will establish a further understanding of mechanism of the nonlinear interaction between light and matter, and will prove to be a disruptive technology and offer a new paradigm for compact, robust and easy-to-use ultrashort pulsed mid-IR sources.

英文关键词： mode-locked fiber laser;graphene;mid-infrared;all-fiber laser;nonlinear fiber optics