基于干涉环结构的调Q光纤激光器  

Q-Switched Fiber Laser with a Ring Interferometer

作　　者：黄琳[1] 代志勇[1] 刘永智[1] 张谦述[1] 

机构地区：[1]电子科技大学光电信息学院,四川成都610054

出　　处：《中国激光》2008年第7期987-991,共5页Chinese Journal of Lasers

基　　金：总装预研基金(51302060101);国防重点实验室基金(51472040205DZ0201)资助项目

摘　　要：从光纤干涉环中受激瑞利散射（SRS）和光纤中受激布里渊散射（SBS）共同作用调Q的原理出发，研究了光纤干涉环耦合比及环长对调Q光纤激光器输出激光特性的影响。分别采用耦合比为50：50，80：20，90：10的光纤干涉环往小同耶长下搭建掺Er^2＋调Q光纤激光器进行实验。实验结果表明，干涉环的耦合比和环长是影响输出激光特性的关键㈥素，耦合率（～10％）的干涉环适宜产生脉冲激光，具有高耦合比干涉环的光纤激光器只有连续激光输出；环长根据干涉环耦合率（～10％）在2m附近调整可以获得理想脉冲激光输出，环长过短时产生输出激光的弛豫振荡，反之产生输出激光脉冲的分裂。采用耦合比为90：10，环长为2m的光纤干涉环时，在37mW的抽运功率下获得脉宽7．2ns，蕈复频率212．4kHz，输出功率5．4mW的脉冲激光，脉冲波形较好，峰值功率有～30％的波动。The co-operation of stimulated Rayleigh scattering （SRS） in fiber interference loop and stimulated Brillouin scattering （SBS） in fiber can change Q value in resonant cavity, based on which an all-fiber Er-doped Qswitched fiber laser with interference loop is designed. In the experiments, the attributes of output laser exploiting interference loops with different coupling ratios and lengths were investigated. A train of pulse laser with pulse duration of 7.2 ns, repetitive frequency of 212.4 kHz, average output power of 5.4 mW at pump power of 37 mW was obtained which had a good waveform and a peak power fluctuation of ～30%. The results show that the interference loop with very high coupling ratio has no contribution to the generation of pulse laser and the coupling ratio of ～10% is suitable for it. Even if the coupling ratio of ～10% is chosen, the length of the loop has influence on the attribute of the output laser pulse and good output can be obtained at the length around 2 m.

关 键 词：激光技术 光纤激光器 调Q光纤激光器 受激布里渊散射 受激瑞利散射 

分 类 号：TN248.1[电子电信—物理电子学]