Effective suppression of mode distortion induced by amplifiers stimulated Raman scattering in high-power fiber

查看全文 作　　者：Wei [1,2,3]Gao;Wenhui [1,3,5]Fan;Pei [1,3]Ju;Gang [1,3]Li;Yanpeng [2]Zhang;Aifeng [4]He;Qi [1,3]Gao;Zhe [1,3]Li

机构地区：[1]State Key Laboratory of Transient Optics and Photonics,Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an 710119,China;[2]Key Laboratory for Physical Electronics and Devices of the Ministry of Education&Shaanxi Key Laboratory of Information Photonic Technique,Xi’an Jiaotong University,Xi’an 710049,China;[3]University of Chinese Academy of Sciences,Beijing 100049,China;[4]Key Laboratory on Applied Physics and Chemistry,Shaanxi Applied Physics and Chemistry Research Institute,Xi’an 710061,China;[5]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《High Power Laser Science and Engineering》索引2021年第9卷第2期,共7页

基　　金：National Natural Science Foundation of China(Nos.62005310 and 61675230);Equipment Pre-research Foundation of China(No.61406190302);Key R&D Program of Shaanxi Province(No.2018ZDXMGY-060);National Key R&D Program of China(No.2017YFB1104400). 摘　　要：Mode distortion induced by stimulated Raman scattering(SRS)has become a new obstacle for the further development of high-power fiber lasers with high beam quality.Here,an approach for effective suppression of the SRS-induced mode distortion in high-power fiber amplifiers has been demonstrated experimentally by adjusting the seed power(output power of seed source)and forward feedback coefficient of the rear port in the seed source.It is shown that the threshold power of the SRS-induced mode distortion can be increased significantly by reducing the seed power or the forward feedback coefficient.Moreover,it has also been found that the threshold power is extremely sensitive to the forward feedback power value from the rear port.The influence of the seed power on the threshold power can be attributed to the fact that the seed power plays an important role in the effective length of the gain fiber in the amplifier.The influence of the forward feedback coefficient on the threshold power can be attributed to the enhanced SRS configuration because the end surface of the rear port together with the fiber in the amplifier constitutes a half-opening cavity.This suppression approach will be very helpful to further develop the high-power fiber amplifiers with high beam quality. 关键词：high-power fiber amplifiers mode distortion stimulated Raman scattering SUPPRESSION

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Effective suppression of mode distortion induced by amplifiers stimulated Raman scattering in high-power fiber

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