Observation of transition between multimode Q-switching and spatiotemporal mode locking  

作　　者：Kewei Liu Xiaosheng Xiao Changxi Yang 

机构地区：[1]State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instruments,Tsinghua University,Beijing 100084,China [2]State Key Laboratory of Information Photonics and Optical Communications,School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China

出　　处：《Photonics Research》2021年第4期530-534,共5页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(51527901,61975090);National Key Scientific Instrument and Equipment Development Projects of China(2014YQ510403);State Key Laboratory of IPOC(BUPT),China(IPOC2020ZT02).

摘　　要：We report experimental observation of multimode Q-switching and spatiotemporal mode locking in a multimode fiber laser.A typical steady Q-switching state is achieved with a 1.88μs pulse duration,a 70.14 kHz repetition rate,and a 215.8 mW output power,corresponding to the single pulse energy of 3.08μJ.We find weak spatial filtering is essential to obtain stable Q-switched pulses,in contrast to the relatively stronger spatial filtering for spatiotemporal mode locking.Furthermore,a reversible transition process,as well as a critical bistable state,between multimode Q-switching and spatiotemporal mode locking,is achieved with specific spatial coupling and waveplates sets.We believe the results will not only contribute to understanding the complicated nonlinear dynamics in multimode,fiber-based platforms,but also benefit the development of promising high-pulse energy lasers.

关 键 词：MULTIMODE fiber SWITCHED 

分 类 号：TN248[电子电信—物理电子学]