光纤激光器弛豫振荡特性研究

根据光纤激光器瞬态的速率方程,对F-P腔光纤激光器的瞬态输出特性进行了理论分析.采用数值计算方法对不同长度、不同腔面反射率、不同抽运功率下光纤激光器输出的弛豫振荡特性进行了模拟分析.结果表明弛豫振荡频率随光纤长度增加而减小,但是随抽运功率的变化很小.弛豫振荡幅度随抽运功率上升而增加,振荡的衰减时间随激光器腔镜的反射率的增加而上升,但是不随抽运功率变化.进行了975 nm抽运的Er/Yb共掺双包层光纤激光器的实验,实验表明理论分析得到的基本特性是合理的.

Studies on Relaxation Oscillation Characteristics of Fiber Lasers

Transient characteristics of Fabry-Perot cavity fiber lasers are analyzed by using the transient rate equations in this paper. Simulation for relaxation oscillation of the laser shows that its frequency decreases with increasing of the fiber length, and changes little with pump power; the amplitude of relaxation oscillation increases with pump power; the time constant of oscillation decay ascends with increasing of reflectivity of the cavity mirror, but changes little with pump power or fiber length. The experimental results on Er/Yb co-doped double-cladding fiber laser pumped by 975nm source showed good agreement with the theoretical calculations, indicating the simulation is reasonable.