光纤环形腔光反馈被动相干合成系统分析  

Analysis on passive phasing in the ring-cavity fiber laser

作　　者：唐选[1,2] 柯伟伟[1,2] 王小军[1,2] 

机构地区：[1]中国工程物理研究院高能激光科学与技术重点实验室,四川绵阳621900 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《红外与激光工程》2014年第5期1421-1427,共7页Infrared and Laser Engineering

基　　金：中国工程物理研究院高能激光科学与技术重点实验室基金(LJG2012-06)

摘　　要：研究了光纤环形腔光反馈系统的锁相原理和锁相过程,分析了聚焦透镜焦距对锁相速度的影响;基于宽谱放大以及受激布里渊散射效应的数值模型,评估了系统各路之间光程的方差大小、动态相位噪声频率大小,受激布里渊散射效应对系统的选频过程及其稳定性的影响。计算结果表明,选择合适的聚焦透镜焦距,可以获得较快的锁相速度;相位噪声会引起光束质量退化,严重时导致跳模现象发生;高功率输出时,光纤中的受激布里渊散射效应会限制各频率下的峰值强度,并导致更多波长激射以及光束质量退化。理论证明了环形腔光反馈会提供一种模式线宽随反馈次数增加而不断压窄的机制,SBS效应的存在则提供了一种谱线展宽机制,使得实际模式线宽稳定在均衡值。The theory and basic properties on the passive phasing in the ring-cavity structure was illustrated. The influence of the focal length on the mode-locking speed was analyzed. An analysis model was established consisting of a broad spectrum amplification model and a simplified model for stimulated Brillouin scattering effect. Speed and stability of the mode-locking in this scheme was shown to be determined by the variance of optical path difference, the dynamic phase noise and the stimulated Brillouin scattering effect. The simulation results show that, using a proper focal length, a fast mode-locking speed is obtained. The phase noise degenerates of the beam quality , and even causes the mode hoping. The stimulated Brillouin scattering effect of the fiber with high power output limits the peak power of each frequency, increases the peak number in the output spectrum, and causes degeneration of beam quality. The mechanism of the mode width decrease with the growth of feedback times is demonstrated in theory. The results show that the stimulated Brillouin scattering effect provides a mechanism of mode width growth, which makes the mode width maintain at a balanced value.

关 键 词：环形腔光反馈被动相干合成 相位噪声 受激布里渊散射 

分 类 号：TN24[电子电信—物理电子学]