摘要
受激拉曼散射(SRS)是制约高功率光纤激光器功率提升和系统稳定性的重要因素,如何有效滤除和抑制SRS是需要解决的关键问题。长周期光纤光栅(LPFG)可将特定波长的纤芯模耦合到包层模实现宽带滤波,有效滤除SRS产生的Stokes光。首次采用CO_(2)激光结合振镜扫描的方法在双包层光纤上制备了LPFG,用于高功率光纤振荡器输出激光中拉曼信号的滤除和抑制,取得了较好的实验效果,Stokes光的滤除率大于15 dB,大大提升了输出激光的纯度和系统的稳定性。采用的制备方法对纤芯几乎不产生影响,理论上具有极低的信号光传输损耗,在高功率光纤激光系统中有重要的应用价值。
Stimulated Raman Scattering(SRS)is the primary restrictive factor in the improvement of output power and stability of high-power fiber laser.Effective filtering and suppressing of SRS are a key dilemma that need resolution.To effectively filter the Stokes light caused by SRS,long period fiber grating(LPFG)can couple core mode with special wavelength to cladding modes to realize bandwidth filtering.Hence,the CO_(2) laser beam combined with scanning galvanometer is used to fabricate LPFG on double cladding fiber to filter and suppress Raman signal in high-power optical fiber oscillator and an evident inhibition is achieved.Results show that the filtering ratio of Stokes light beyond 15 dB,the purity of signal laser and stability of the system have improved considerably.Because there is no effect on fiber core,theoretically,the proposed method has a very low signal optical transmission loss,which is of great value in high-power fiber laser.
作者
胡琪浩
赵晓帆
田鑫
李宏业
王蒙
王泽锋
许晓军
Hu Qihao;Zhao Xiaofan;Tian Xin;Li Hongye;Wang Meng;Wang Zefeng;Xu Xiaojun(College of Advanced Interdisciplinary Studies,National Uriiversity of Deferise Technology,Changsha,Hunan 410073,China;State Key Laboratory of Pulsed Power Laser Technology,Changsha,Huyian 410073,China;Hunan Key Laboratory of High Energy Laser Tecfniology,Changsha,Hunan 410073,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2021年第18期35-41,共7页
Acta Optica Sinica
基金
国家自然科学基金面上项目(11974427,12004431)
湖南省自然科学基金杰出青年科学基金(2019JJ20023)
脉冲功率激光国家重点实验室主任基金(SKL-2020-ZR05)。
