摘要
微纳光纤是一种直径接近或小于传输光波长的纤维波导,由于纤芯和包层折射率差较大,具有强光场约束、强倏逝场、低损耗、反常波导色散、表面均匀性好和机械性能高等特性。近年来,以纳米材料作为饱和吸收体的被动锁模激光器成为超短脉冲激光技术方向的研究热点。得益于微纳光纤的强光场约束能力及大比例倏逝场,纳米材料与微纳光纤的复合结构能显著增强光与物质的相互作用,进而降低该复合结构的饱和吸收阈值,为超短脉冲产生和非线性动力学等研究提供一个新颖而灵活的平台。同时,微纳光纤因具有反常波导色散、光谱滤波、饱和吸收和偏振敏感等特性,在激光器的色散调控、偏振锁模等方面获得应用。介绍了微纳光纤的制备和特性以及在锁模激光方面的典型应用和相关技术的最新进展,并就未来的发展方向进行了展望。
Optical microfibers or nanofibers are waveguides with diameters close to or smaller than the guided wavelength. Because of the high contrast of the refractive index between the core and cladding material, they have the properties like strong light confinement, enhanced evanescent field, ultralow loss, abnormal waveguide dispersion, excellent surface uniformity and mechanical stability. In recent years, passively mode-locked fiber lasers based on nanomaterials saturable absorber have been a hotspot in the research field of ultrashort pulse generation.Benefitting from strong light confinement and large proportion of evanescent fields, the hybrid structure of nanomaterial and microfiber could enhance light-material interaction significantly and reduce the saturable absorption threshold, thus provide a flexible and innovative platform for the research on ultrashort pulse generation and nonlinear dynamics. Meanwhile, it has the properties of abnormal waveguide dispersion, spectral filtering,saturable absorption and polarization sensitivity, thus it could be applied for dispersion management and polarization induced mode-locking. This review article introduces the fabrication and characteristics of microfiber, its typical applications on mode-locked lasers, and related technology developments. The perspectives for future directions are also mentioned.
作者
王利镇
李林军
童利民
Wang Lizhen;Li Linjun;Tong Limin(State Key Laboratory of Modern Optical Instrumentation,College of Optical Science and Engineering,Zhejiang Universityt Hangzhou,Zhejiang 310027,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2019年第1期181-199,共19页
Acta Optica Sinica
基金
国家自然科学基金(61475140
11527901
61635009)
关键词
微纳光纤
锁模激光器
饱和吸收体
色散调控
microfibers
mode-locked lasers
saturable absorber
dispersion management
