基于二维材料异质结可饱和吸收体的超快激光器  

Ultrafast pulse lasers based on two-dimensional nanomaterial heterostructures as saturable absorber

作　　者：龙慧 胡建伟 吴福根[1] 董华锋[1] Long Hui;Hu Jian-Wei;Wu Fu-Gen;Dong Hua-Feng(School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学物理与光电工程学院,广州510006

出　　处：《物理学报》2020年第18期316-334,共19页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62005053);广东工业大学青年百人项目(批准号:220413293);广东省自然科学基金(批准号:2020A1515011178,2017B030306003)资助的课题.

摘　　要：可饱和吸收体作为非线性光学行为的物质载体,是获得超快激光的关键材料.基于石墨烯、过渡金属硫化物、拓扑绝缘体、黑磷等二维材料为代表的可饱和吸收体具有不同的光学优点,但仅依赖某一方面光学优势的单一材料,很难避免其应用的局限性.通过异质结结构结合不同二维材料的优势,达到光学互补效应,为制备高性能的新型可饱和吸收体,实现短脉宽高峰值功率的输出提供了思路和借鉴.本文总结了异质结可饱和吸收体的制备方法、能带匹配模型、电子跃迁机理,并从工作波长、输出脉宽、重复频率、脉冲能量等重要参数对国内外基于二维材料异质结激光器的研究进展进行了综述,此外,对二维材料异质结在光调制器、超快激光、可饱和吸收体、光开关等方向的发展前景进行了展望.As the substance carrier of nonlinear optical phenomenon,saturable absorber is an essential material for generating the ultrafast pulse laser.The saturable absorbers based on graphene,transition metal sulfides,topological insulators,black phosphorus and other two-dimensional(2D)materials exhibit different optical advantages.However,limitations of those single 2D materials as saturable absorbers exist.The nanomaterial heterojunction structure can combine the advantages of different 2D materials to achieve optical complementarity,and it also provides new ideas for generating the ultrafast laser with ultrashort pulse duration and high peak power.Here in this paper,the preparation methods,band alignment and the electronic transition mechanism of heterojunction saturable absorbers are summarized,and the recent research progress of ultrafast lasers based on 2D nano-heterostructures are also reviewed,including the wavelength,pulse width,repetition frequency and pulse energy.Therefore,2D nano-heterostructure exhibits great potential applications in future optical modulator and optical switch.

关 键 词：二维材料 异质结 可饱和吸收体 超快激光 

分 类 号：TN248[电子电信—物理电子学] TB383.1[一般工业技术—材料科学与工程]