复合型狄拉克材料的制备及其在超快激光中的应用研究

项目名称： 复合型狄拉克材料的制备及其在超快激光中的应用研究

项目编号： No.11474187

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 满宝元

作者单位： 山东师范大学

项目金额： 96万元

中文摘要： 超快激光的发展在很大程度上依赖于可饱和吸收材料的发展。目前已有的研究包括本课题组近几年开展的研究表明以石墨烯和拓扑绝缘体为代表的狄拉克材料作为饱和吸收体具有损伤阈值高、调制深度大、波长可调谐范围宽和恢复时间短等优点，有利于实现高功率长时间稳定的锁模运转，同时也存在晶格失配大、容易氧化、尺寸小、层数不可控以及转移过程易造成损伤等问题。本课题在过去研究的基础上，将在石墨烯基底上生长拓扑绝缘体形成复合型狄拉克饱和吸收体，以克服二者单独作为饱和吸收体所存在的不足，进而改善光学吸收特性；通过对生长机理的研究，寻找最佳生长条件，通过改进转移技术精确控制材料的层数、厚度和面积，实现对复合型饱和吸收体参数的优化；探索在光纤上直接生长狄拉克材料，避免转移损伤，提高狄拉克材料的饱和吸收性能；将复合型饱和吸收体分别应用于固态激光器和光纤激光器，通过优化参数，最终实现飞秒量级1-3μm波段连续锁模激光的稳定输出。

中文关键词： 复合型狄拉克材料；石墨烯；拓扑绝缘体；饱和吸收体；超快激光

英文摘要： Development of ultrafast laser is largely dependent on the development of saturable absorption material. Graphene and topological insulators are typically Dirac materials. Currently research, including research conducted by our group in recent years, have proved that graphene or topological insulators as saturable absorber has lots of advantages, such as high thermal damage threshold, great modulation depth, wide wavelength tuning range, and short recovery time. It is conducive to the realization of a high-power and long stable mode-locked operation. But there is also a lot of problems, such as large lattice mismatch, easily oxidized, small size, layers uncontrollable, easily damaged during transfer process. Based on our research, composite Dirac saturated absorber is made with topological insulators growing on graphene substate, which can overcome drawbacks of topological insulators or graphene alone as saturable absorber and further improve optical absorption proproties. By exploring the growth mechanism, the optimized growth condition can be found, by improving the material transfer techniques, the material's layer, thickness and area can be precisely controlled, and then the optimization of the parameters of the composite saturable absorber can be got. Dirac material is directly grown on a quartz fiber, avoiding damage caused by the transfer process, and increase the saturation absorption properties of Dirac materials. After optimizing the parameters of the solid-state and fiber laser, a femtosecond 1-3 μm continuous mode-locked laser stable output can be obtained.

英文关键词： composite Dirac material;graphene;topological insulators;saturable absorber;ultrafast laser