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In-band pumping avenue based high power superfluorescent fiber source with record power and near-diffraction-limited beam quality

查看全文 作　　者：Jiangming [1,2]Xu;Jun [1]Ye;Hu [1,2]Xiao;Jinyong [1,2]Leng;Wei [1]Liu;Pu [1,2]Zhou 高影响力作者 机构地区：[1]College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, China;[2]Hunan Provincial Collaborative Innovation Center of High Power Fiber Laser, Changsha 410073, China高影响力机构 出　　处：《High Power Laser Science and Engineering》索引2018年第6卷第3期,共6页高影响力期刊 基　　金：supported in part by the National Natural Science Foundation of China (No. 61322505);the Foundation for the author of National Excellent Doctoral Dissertation of China (No. 201329);the Huo Yingdong Education Foundation of China (No. 151062);the Hunan Provincial Innovation Foundation for Postgraduate Student (No. CX2017B030) 摘　　要：High power superfluorescent fiber sources(SFSs), which could find wide applications in many fields such as middle infrared laser generation, Raman fiber laser pumping and spectral beam combination, have experienced a flourishing time in recent years for its unique properties, such as short coherence length and high temporal stability. The challenge for performance scalability of powerful SFS mainly lies on the physical issues including parasitic laser oscillation and modal instability(MI). In this contribution, by employing in-band pumping avenue and high-order transverse-mode management, we explore a high power SFS with record power, near-diffraction-limited beam quality and spectral manipulation flexibility. An ultimate output power of 3.14 kW can be obtained with high temporal stability and a beam quality of M^2= 1.59 for the amplified light. Furthermore, the dynamics of spectral evolutions, including redshifting of central wavelength and unsymmetrical broadening in spectral wings, of the main amplifier with different seed linewidths are investigated contrastively. Benefiting from the unique high pump brightness and high MI threshold of in-band pumping scheme, the demonstrated system also manifests promising performance scaling potential. 关 键 词：光纤光源 光谱 技术研究 理论分析
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