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采用布拉格光纤光栅作为谐振腔,实现了980nm半导体激光器端面泵浦下的双包层掺镱光纤激光器的连续和调Q运转。连续激光实验结果表明,在泵浦功率固定时,增益光纤存在激光输出功率最大情况下的最佳长度,当泵浦功率增大时,最佳增益光纤长度也随之增加。采用石墨烯分散液作为可饱和吸收体,插入增益光纤与布拉格光纤光栅之间,实现了光纤激光器的稳定被动调Q运转。当泵浦功率为2.87 W时,得到了最小脉冲宽度33ns、重复率38.5kHz的脉冲序列;随着泵浦功率进一步增大,出现不稳定的调Q锁模现象。
The Bragg fiber grating is used as the resonator to realize the continuous and Q-switched operation of the double-clad Yb-doped fiber laser under the 980nm end-pumped semiconductor laser. The experimental results of continuous laser show that when the pump power is fixed, the gain fiber has the best length with the maximum laser output power. As the pump power increases, the optimal gain fiber length also increases. The graphene dispersion was used as saturable absorber, and inserted between the gain fiber and Bragg fiber grating to achieve a stable passive Q-switched operation of the fiber laser. When the pump power is 2.87 W, a pulse sequence with a minimum pulse width of 33 ns and a repetition rate of 38.5 kHz is obtained. As the pump power is further increased, an unstable Q-switched mode phenomenon occurs.