空间多点泵浦对光纤放大器SBS效应抑制的研究  

Suppression of Stimulated Brillouin Scattering in Fiber Amplifiers by Space Multi-Points Pumped Technology

作　　者：赵海川[1,2] 陶蒙蒙 王振宝[1,2] 朱永祥 陈绍武[1,2] 闫燕 叶锡生[3] ZHAO Hai-chuan;TAO Meng-meng;WANG Zhen-bao;ZHU Yong-xiang;CHEN Shao-wu;YAN Yan;YE Xi-sheng(Northwest Institute of Nuclear Technology,Xi’an 710024,China;State Key Laboratory of Laser Interaction with Matter,Xi’an 710024,China;Shanghai Institute of Optics and Fine Mechanics,Shanghai 201800,China)

机构地区：[1]西北核技术研究所,西安710024 [2]激光与物质相互作用国家重点实验室,西安710024 [3]上海光学精密机械研究所,上海201800

出　　处：《现代应用物理》2018年第2期24-29,共6页Modern Applied Physics

摘　　要：对主振荡功率放大(MOPA)结构的光纤激光器,采用空间多点泵浦方法,改变介质中增益的空间分布,能够在保证放大器效率的同时有效抑制光纤中的后向SBS散射光。对百瓦级光纤放大器中信号光、散射光及增益分布进行了数值模拟,分析了散射光放大原因,并将两点泵浦应用于该放大器系统,相同输出功率时,散射光由3.2 W降为6.8mW。计算结果表明,多点泵浦技术的引入,能有效抑制光纤放大器中的SBS效应。The output power of a narrow line-width laser is usually limited by the Stimulated Brillouin Scattering(SBS)effect.In a master oscillator power amplifier(MOPA)structures,the multi-point pump could manipulate the spatial distribution of the gain inside the fiber through variations of the number and power of the pump source,leading to the suppression of the SBS effect with maintained amplification efficiency.A theoretical model concerning the 100 W-level fiber amplifiers is proposed.Stimulation is performed to analyze the amplification process of the laser signal and SBS.The results demonstrate that the power of SBS decreases from 3.2 W to 6.8 mW over the same output power,indicating the effectiveness of this new technology in SBS suppression.

关 键 词：光纤放大器 受激布里渊散射 抑制 多点泵浦 

分 类 号：TN244[电子电信—物理电子学]