种子相位和强度同时调制抑制光纤激光放大器SBS的新方法研究  

Novel Suppression Method Study for Stimulated Brillouin Scattering by Simultaneous Phase and Intensity Modulation in Fiber Amplifiers

作　　者：冉阳[1] 王小林[1] 吕海斌[1] 粟荣涛[1] 周朴[1] 司磊[1] 

机构地区：[1]国防科学技术大学光电科学与工程学院,湖南长沙410073

出　　处：《中国激光》2015年第8期150-155,共6页Chinese Journal of Lasers

基　　金：湖南省自然科学基金(14JJ3004);湖南省教育厅科学研究项目(YB2013B003)

摘　　要：在高功率光纤放大器系统中,受激布里渊散射(SBS)效应由于其较低的阈值特性成为光纤放大器功率提升的首要限制因素。为了提高SBS阈值,提出了一种基于对入射种子光同时施加相位调制和强度调制抑制SBS的新方法。建立了光纤激光放大器中的SBS效应激励模型对该方法进行理论仿真。仿真结果表明,该方法可以在窄线宽激光输出的条件下显著提高光纤激光放大器中的SBS阈值,在对20 W入射种子光同时施加100 MHz,10 V的相位调制和10 MHz,4 ns的强度调制后,放大器输出功率可达1127.4 W,为单频光SBS阈值的18倍。In high power fiber amplifier system, stimulated Brillouin scattering（SBS） becomes the primary limiting factor to achieve high power because of its relatively lower threshold. In order to improve SBS threshold, a new method to suppress SBS is presencted, which needs to modulate the incident seed laser both in phase and intensity. A model of SBS dynamics to numerically simulate the SBS threshold is established after using this method. The simulation results show that this method using phase modulation and intensity modulation simultaneously can greatly enhance SBS threshold under the condition of narrow linewidth output.When 20 W seed laser is put into a fiber amplifier system after phase modulation of 100 MHz, 10 V and intensity modulation of 10 MHz, 4 ns, the output power of fiber amplifier can reach 1127.4 W, which is 18 times of that of the SBS threshold for single frequency laser.

关 键 词：非线性光学 受激布里渊散射 相位调制 强度调制 光纤放大器 

分 类 号：O437[机械工程—光学工程]