Influence of optical nonlinearity on combining efficiency in ultrashort pulse fiber laser coherent combining system  

作　　者：Yun-Chen Zhu Ping-Xue Li Chuan-Fei Yao Chun-Yong Li Wen-Hao Xiong Shun Li 朱云晨;李平雪;姚传飞;李春勇;熊文豪;李舜(Institute of Ultrashort Pulsed Laser and Application,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;Department of Physics,Durham University,South Road,Durham DH13LE,UK)

机构地区：[1]Institute of Ultrashort Pulsed Laser and Application,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China [2]Department of Physics,Durham University,South Road,Durham DH13LE,UK

出　　处：《Chinese Physics B》2022年第6期342-348,共7页中国物理B（英文版）

基　　金：upported by the Key Program of Beijing Municipal Natural Science Foundation,China(Grant No.KZ201910005006);the National Natural Science Foundation of China(Grant No.62005004);Natural Science Foundation of Beijing Municipality,China(Grant No.4204091);National Science Foundation for Post-doctor Scientists of China(Grant No.212423)。

摘　　要：The influence of optical nonlinearity on combining efficiency in ultrashort pulse fiber laser coherent combining system is investigated theoretically and experimentally.In the theoretical work,a new theoretical algorithm is presented for the coherent combining efficiency,which can be used to quantify the spectral coherence decay induced by optical nonlinearity imbalance between the sub-beams.The spectral information of the sub-beam is obtained by numerically solving the nonlinear Schrödinger equation(NLSE)in this algorithm to ensure an accurate prediction.In the experimental work,the coherent combining of two all-fiber picosecond lasers is achieved,and the influence of imbalanced optical nonlinearity on the combining efficiency is studied,which agrees with the theoretical prediction.This paper reveals the physical mechanism for the influence of optical nonlinearity on the combining efficiency,which is valuable for the coherent combining of ultrashort pulse fiber laser beams.

关 键 词：coherent beam combination spectral coherence optical nonlinearity 

分 类 号：TN248[电子电信—物理电子学] O437[机械工程—光学工程]