Li Wencai, Liu Haowei, Zhang Ji, Long Hu, Feng Sujuan, Mao Qinghe
Appl Opt. 2016 Jun 10;55(17):4584-8. doi: 10.1364/AO.55.004584.
The operation mechanism and the pulse property of an actively Q-switched erbium-doped fiber laser based on an acousto-optic modulator (AOM) switch with the injection seeding technique are investigated. Our results show that the Q-switched pulses can be locked to oscillate near a fixed frequency higher than that of the seed laser, though the frequency-shift effect of the AOM impedes stable cavity mode oscillations. The operation mechanism of such Q-switch fiber lasers can be explained by the mutual locking-in among the shifted frequency components originated from the injected coherence seed with the help of the gain dynamics of the Q-switch cavity. Moreover, narrow-linewidth Q-switched pulses with different repetition rates can be obtained with different cavity lengths for incredibly stable output pulses without any use of cavity-stabilized techniques.
研究了基于声光调制器（AOM）开关并采用注入种子技术的主动调Q掺铒光纤激光器的运行机制和脉冲特性。我们的结果表明，尽管AOM的频移效应阻碍了稳定的腔模振荡，但调Q脉冲可以被锁定在高于种子激光器频率的固定频率附近振荡。这种调Q光纤激光器的运行机制可以通过注入的相干种子产生的频移分量之间的相互锁定，并借助调Q腔的增益动力学来解释。此外，通过使用不同的腔长，可以获得具有不同重复频率的窄线宽调Q脉冲，以实现极其稳定的输出脉冲，而无需使用任何腔稳定技术。
