基于石墨烯的中红外高功率调Q光纤激光器基础研究

项目名称： 基于石墨烯的中红外高功率调Q光纤激光器基础研究

项目编号： No.61505024

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： 韦晨

作者单位： 电子科技大学

项目金额： 22万元

中文摘要： 高功率中红外波段调Q光纤激光器在科研、军事、生物医疗及民用等领域具有广泛应用前景，是国内外研究的热点。然而目前中红外调Q光纤激光器的输出功率多在mW量级，脉冲能量仅为nJ或几µJ，还处于较初级的阶段。本项目拟针对功率水平提高的三个关键物理机制问题，对基于石墨烯的3µm高功率调Q 光纤激光器展开系统研究。拟揭示石墨烯层数、均匀度等特性对中红外调Q性能的影响；建立多级脉冲功率放大系统物理模型；针对高功率运转下的关键热沉积问题，建立瞬态脉冲泵浦下光纤内三维热传导模型，揭示热沉积机理，探索从物理机制上减少热沉积及去热梯度制冷方法；结合理论优化实验设计提高激光效率及输出功率。.本项目拟解决的高功率下光纤内的热沉积问题及功率放大系统的效率及功率水平提高的问题等是中红外波段实现高能脉冲的共性问题，研究结果具有良好的移植性。项目的开展将促进中红外高功率调Q光纤激光技术的发展。

中文关键词： 中红外；高功率；调Q；石墨烯；光纤激光器

英文摘要： High power mid-infrared Q-switched fiber lasers have attracted significant attentions because of their numerous applications in scientific research, military, biomedical treatment and civil areas. However, the current mid-infrared Q-switched fiber lasers’ output powers and pulse energies are olny at mW and nJ/several µJ level, respectively, which makes them still at a primary stage. In this project, three key physical mechanisms in 3µm high power graphene Q-switched Er3+-doped fluoride fiber laser will be systematically investigated. The dependence of the Q switched performances on the graphene layers and uniformity, etc, will be studied. A physical model of multistage pulses amplification system will be established. Instantaneously pulses pumped 3-dementional heat transmission model in the fiber will be established, the heat deposition mechanism will be revealed and techniques to physically reduce the heat deposition and thermal gradient will be explored. Experimental optimization will be performed based on the theoretical study to improve the laser efficiency and output power..The heat deposition, efficiency and output power enhancement of the multistage amplification system are common issues when comes to mid-infrared high power fiber lasers, the project results have good portabilities. This project will promote the development of the mid-infrared high power Q-switched fiber laser technique.

英文关键词： mid-infrared;high power;Q-switch;graphene;fiber laser