Tracing the origins of mode coupling for beam quality optimization in high-power fiber laser delivery systems  

作　　者：Xiao Chen Shanmin Huang Liangjin Huang Lei Du Zhiping Yan Zhiyong Pan Pu Zhou Zongfu Jiang 

机构地区：[1]College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha,China [2]Nanhu Laser Laboratory,National University of Defense Technology,Changsha,China [3]Hunan Provincial Key Laboratory of High Energy Laser Technology,National University of Defense Technology,Changsha,China

出　　处：《High Power Laser Science and Engineering》2024年第5期1-12,共12页高功率激光科学与工程(英文版)

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB3606000);the National Natural Science Foundation of China(Nos.12174445 and 62061136013);the State Key Laboratory of Pulsed Power Laser Technology(No.SKL2021ZR06)。

摘　　要：Suppressing mode degradation is the key issue for high-power laser delivery;however,diagnosing mode degradation in its entirety,ranging from the contents and origins to locations,has always been a major obstacle.Here,a versatile approach for tracing the origins of mode coupling is demonstrated through addressing the differential intermodal dispersions of fiber modes.Full recognition for modal contents and the origins of mode degradation are experimentally completed in a two-mode fiber laser delivery system,which assists a significant improvement of beam quality M^(2)from1.35 to 1.15 at the highest power of over 300 W.This method yields a quantitative characterization for manipulating the individual mode of dual-mode coupling origins or their combinations.This work points toward a promising strategy for the online tracing of mode coupling in cascade fiber links,thus enabling further pursuit of seeking extreme beam quality in high-power fiber laser systems.

关 键 词：beam quality intermodal dispersion laser delivery mode diagnosis origins of mode coupling 

分 类 号：TN2[电子电信—物理电子学]