本文对连续波半导体激光器端面抽运的Fabry-Perot腔掺Yb3+双包层光纤激光器的自脉动输出行为进行了研究.发现低Q值腔光纤激光器具有两种形式的自脉动输出,一种是饱和吸收被动调Q产生的自脉冲,另一种是与光纤中的受激Raman散射(SRS)效应相对应的阵发性巨脉冲.通过提高光纤激光器谐振腔的Q值并选择合适的抽运功率,可以有效地减小输出功率的自脉动,获得稳定的连续波激光输出.

Self-pulsation behavior of Yb3+-doped double clad fiber lasers formed in Fabry-Perot cavities and end-pumped by CW laser diode (LD) is investigated. Two kinds of self-pulsation are observed in the fiber laser with a low Q cavity, one is the pulse generated from passive Q-switching of saturable absorption;the other is the giant pulse due to stimulated Raman scattering (SRS) in the fiber. It is demonstrated that by promoting the Q value of the cavity the pulsation in the output of the fiber laser can be reduced and stable CW output will be obtained while an appropriate rate of pump is applied simultaneously.