Dynamic gain driven mode-locking in GHz fiber laser

作     者：Xuewen Chen Wei Lin Xu Hu Wenlong Wang Zhaoheng Liang Lin Ling Yang Yang Yuankai Guo Tao Liu Dongdan Chen Xiaoming Wei Zhongmin Yang Xuewen Chen;Wei Lin;Xu Hu;Wenlong Wang;Zhaoheng Liang;Lin Ling;Yang Yang;Yuankai Guo;Tao Liu;Dongdan Chen;Xiaoming Wei;Zhongmin Yang

作者机构：School of Physics and OptoelectronicsState Key Laboratory of Luminescent Materials and DevicesGuangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and DevicesGuangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSouth China University of TechnologyGuangzhouChina Research Institute of Future TechnologySouth China Normal UniversityGuangzhouGuangdongChina 

出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)

年 卷 期：2024年第13卷第11期

页      面：2715-2725页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 

基　　金：supported by National Natural Science Foundation of China(NSFC)(62375087) NSFC Development of National Major Scientific Research Instrument(61927816) Key-Area Research and Development Program of Guangdong Province(2023B0909010002) Introduced Innovative Team Project of Guangdong Pearl River Talents Program(2021ZT09Z109) Natural Science Foundation of Guangdong Province(2021B1515020074) 

主　　题：fiber mode locking 

摘      要：Ultrafast lasers have become powerful tools in various fields,and increasing their fundamental repetition rates to the gigahertz(GHz)level holds great potential for frontier scientific and industrial *** various schemes,passive mode-locking in ultrashort-cavity fiber laser is promising for generating GHz ultrashort pulses(typically solitons),for its simplicity and ***,its pulse energy is far lower than the critical value of the existing theory,leading to open questions on the mode-locking mechanism of GHz fiber ***,we study the passive mode-locking in GHz fiber lasers by exploring dynamic gain depletion and recovery(GDR)effect,and establish a theoretical model for comprehensively understanding its low-threshold mode-locking mechanism with multi-GHz fundamental repetition ***,the GDR effect yields an effective interaction force and thereby binds multi-GHz solitons to form a counterpart of soliton *** is found that the resulting collective behavior of the solitons effectively reduces the saturation energy of the gain fiber and permits orders of magnitude lower pulse energy for continuous-wave mode-locking(CWML).A new concept of quasi-single soliton defined in a strongly correlated length is also proposed to gain insight into the dynamics of soliton assembling,which enables the crossover from the present mode-locking theory to the existing ***,two distinguishing dynamics of Q-switched mode-locking that respectively exhibit rectangular-and Gaussian-shape envelopes are theoretically indicated and experimentally verified in the mode-locked GHz fiber laser through the measurements using both the standard real-time oscilloscope and emerging time-lens *** on the proposed criterion of CWML,we finally implement a GDR-mediated mode-locked fiber laser with an unprecedentedly high fundamental repetition rate of up to 21 GHz and a signal-tonoise ratio of 85.9 dB.