被动锁模光纤激光器光谱边带  

Study on Side Bands in Passively Mode-Locked Fiber Laser

作　　者：赵羽[1] 刘永智[1] 赵德双[2] 黄琳[1] 代志勇[1] 

机构地区：[1]电子科技大学光电信息学院,四川成都610054 [2]电子科技大学物理电子学院,四川成都610054

出　　处：《光学学报》2009年第4期991-995,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60736038);国家863计划基金(2007AA01Z269);国防预研(9140A020A0106DZ0222)资助

摘　　要：基于非线性偏振旋转锁模原理、非线性薛定谔方程和色散波干涉理论,建立了被动锁模光纤激光器的光谱分析模型。采用此模型进行数值仿真,研究了腔体长度、增益光纤长度和耦合输出比对光谱边带的影响。并分别采用13 m、16 m和26 m的腔长,0.5 m,1.5 m和3 m的掺铒光纤以及不同的耦合输出比进行了实验,对比了上述情况下激光器的输出光谱。实验与仿真结果表明,要抑制光谱边带,应尽量缩短腔长,适当增加增益光纤的长度和采用较低的耦合输出比,并保证激光器处在基阶锁模状态。理论模型的仿真结果与实验现象吻合较好。取3 m增益光纤、13 m腔长和10%的输出比,获得了光谱边带抑制较好、谱宽20.4 nm的锁模脉冲激光,重复频率为15.87 MHz,单脉冲能量约0.52 nJ,脉冲幅值和光谱谱宽分别存在约4%和2%的波动。A model was established to analyze the side bands suppression methods of mode-locked fiber laser. The model was based on nonlinear Schrodinger （NLS） equation, nonlinear polarization rotation mode-locking principle and dispersion wave interference theory. The affects of cavity length, gain fiber length and coupling output ratio on the side bands were anelyzed. Mode-locked fiber laser with 0.5 m, 1.5 m and 3 m Er^3＋ -doped fiber （EDF）, 13 m, 16 m and 26 in ring length and different output ratios was experimentally studied. Theoretical simulation and experiments show that the EDF length should be appropriately increased to restrain side bands, the ring length should be decreased, the output coupling ratio should be small and the fiber laser should be mode-locked on the fundamental order. The fiber laser with 3 m EDF. 10% ratio and 13 m ring length was experimentally carried out. The output pulse with restrained side bands and spectrum width of 20.4 nm is detected. The repetition rate is 15.87 MHz, and the single pulse energy is 0.52 nJ. The fluctuations of pulse amplitude and spectrum width are 4% and 2 %.

关 键 词：光纤激光器 光潜边带 增益光纤长度 腔体长度 耦合输出比 

分 类 号：TN253[电子电信—物理电子学]