不同脉冲重复频率下抽运方式对全光纤声光调Q激光器性能的影响  

Influences of pumping manners on characteristics of all-fiberacousto-optic Q-switched lasers under different pulse repetition rates

作　　者：黄琳[1] 代志勇[1] 刘永智[1] 

机构地区：[1]电子科技大学光电信息学院,成都610054

出　　处：《物理学报》2009年第10期6992-6999,共8页Acta Physica Sinica

基　　金：国防预研基金(批准号:51472040205DZ0201)资助的课题~~

摘　　要：在不同初始边界条件下数值求解描述全光纤声光调Q双包层光纤激光器的速率方程,得到前向抽运结构和后向抽运结构下激光器上能级粒子数在增益光纤中的分布,以及脉冲能量、平均功率、脉宽、光纤中储能与脉冲重复频率、抽运合束器对信号光透过率、抽运功率的相互关系.从谐振腔内放大自发辐射光的产生影响谐振腔损耗的角度分析仿真结果,并实验验证两种抽运方式对输出脉冲功率和脉冲宽度的影响.结果表明:不同脉冲重复频率下抽运方式会对全光纤声光调Q激光器性能产生显著影响,为获得较好的脉冲输出性能,在重复频率较低时应采用前向抽运方式,反之,则应采用后向抽运方式.The rate equations of all-fiber acousto-optic Q-switched lasers were solved under different initial boundary conditions by numerical simulation,and the distribution of upper-level population density along the doped fiber under forward pumping and backward pumping,and the relations between pulse energy,average power,pulse width,stored energy and pulse repetition rate,signal transmittance of the pump coupler,and pump power,were obtained.The simulation was analyzed from the viewpoint of the amplified spontaneous emission light, and an all-fiber Yb^3＋-doped acousto-optic Q-switched laser was employed experimentally to test the effect of pumping manners on the average power and pulse width. The results show that pumping manners significantly affect the performance of all-fiber acousto-optic Q-switched lasers under different pulse repetition rates, so the lasers should be forward pumped for better characteristics of output pulses under lower pulse repetition rate, and they should be backward pumped under higher pulse repetition rate.

关 键 词：光纤激光器 声光调Q 抽运方式 

分 类 号：TN248[电子电信—物理电子学]