时 间： 2022 年 10 月 18 日 11 : 00 - 13 : 00
Zoom： 992 8936 0097
报告人： Sergey A. Babin 教授， 俄罗斯科学院自动化与测电研究所
邀请人： 赵鹭明教授，华中科技大学光学与电子信息学院
报告题目：From discovery of random Raman lasing via natural Rayleigh scattering in ultra-long fibers to unique lasing and sensing features of multimode and multicore fibers with fs-inscribed regular and random 3D refractive-index structures
报告摘要：
在二极管泵浦的拉曼光纤激光器的多模渐变折射率光纤中，通过飞秒脉冲刻写FBG，可产生接近衍射极限的输出光束。这一技术已经应用于工业（通信、生物医学、材料加工、基础设施和能源行业）中的各种激光和传感器系统。从超长光纤自然瑞利散射引起的随机拉曼激光的发现出发，主讲人将介绍使用fs 脉冲刻写具有规则/随机的3D 折射率结构的多模、多芯光纤的技术，以及新型光纤所具有的独特激光和传感性能，这种新型光纤有望在物理上将产生新的基本效应，在实际生产中可以获得新的应用。
Diode-pumped Raman fiber lasers in multimode graded–index fibers with fs-pulse inscribed FBGs generating near diffraction limited output beam have been demonstrated. Various laser and sensor systems for industrial applications (communications, biomedicine, material processing, infrastructure and energetics) have been realized. From discovery of random Raman lasing via natural Rayleigh scattering in ultra-long fibers, speaker will introduce the unique lasing and sensing features of multimode and multicore fibers with fs-inscribed regular and random 3D refractive-index structures. The multimode and multicore fibers with fs-inscribed regular and random 3D refractive-index structures enabling both new fundamental effects and new opportunities in practical applications.
报告人介绍：
Sergey A. Babin，俄罗斯科学院院士。1983 年在新西伯利亚国立大学获得物理学硕士学位，在俄罗斯科学院西伯利亚分部的自动化与电测学研究所获得物理学博士（1990年）和数学博士学位（2003年）。2007年起担任光纤实验室主任，2018年起担任研究所所长。他同时兼任新西伯利亚国立大学物理系教授，主讲光纤光学。Sergey A. Babin是 OSA、SPIE 和 IEEE Photonics 学会会员，Applied Photonics 期刊（俄语版）主编，Laser Physics 等期刊的专题编辑。Sergey A. Babin在 2000 年与德国加兴(Garching)马克斯普朗克地外物理研究所的同事合作开发了首个高功率激光导星光源；2009 年与阿斯顿大学（英国）的同事合作开发了长度最长的光纤激光器（达 300 公里），证实了随机瑞利后向散射的所起的重要作用。从 2010 年开始，他和他的团队提出并演示了具有创纪录参数（效率、偏振消光比、平面调谐和多波长方案等）的随机拉曼光纤激光器，以及其他新颖的拉曼光纤激光器方案。Sergey A. Babin探究了光纤激光器中的光谱形成及其功率展宽现象；发现了啁啾脉冲的基本限制；在全光纤振荡器中产生了能量最大的飞秒脉冲。Sergey A. Babin还展示了通过高效拉曼和 FWM 转换产生新波长的飞秒脉冲；开发了通过在光纤涂层写入光纤布拉格光栅 (FBG) 从而得到独特激光和传感特性的飞秒刻写技术。
Sergey A. Babin, Corresponding member of RAS. He received MSc in physics from the Novosibirsk State University in 1983, and PhD (1990) and DSc (2003) degrees in physics and mathematics from the Institute of Automation and Electrometry of RAS Siberian Branch (Novosibirsk, Russia). He has been working as a head of the Fiber Optics Laboratory since 2007, and as a director of the Institute since 2018. He is also Professor of Novosibirsk State University reading lectures on fiber optics at Physics department. He is a member of OSA, SPIE and IEEE Photonics societies, chief editor of Applied Photonics journal (in Russian), and topical editor of Laser Physics and other journals. For his scientific achievements he has been elected to be a corresponding member of Russian Academy of Sciences (RAS). His achievements include the development in collaboration with colleagues from MPE Garching (Germany) of a first powerful laser guide star source in 2000, the longest fiber laser (up to 300 km) with colleagues from Aston university (UK) in 2009, in which the role of random Rayleigh back-scattering is shown to become important. Starting from 2010, he and his team proposed and demonstrated random Raman fiber lasers with record parameters (efficiency, polarization extinction ratio, flat tuning and multi-wavelength regimes, etc.), as well as other novel schemes and regimes of Raman fiber lasers. The spectrum formation and its power broadening in fiber lasers has been also described. Fundamental limitations for chirped pulses found and femtosecond pulses with maximum energy in an all-fiber oscillator have been generated. Their efficient Raman and FWM conversion enabling generation of femtosecond pulses at new wavelengths has been also demonstrated. Femtosecond technology of writing fiber Bragg gratings (FBGs) through the fiber coating with unique lasing and sensing characteristics has been developed.
