腔内相位调制全光纤脉冲激光器Ⅰ: 实验

报道了在低频直接相位调制下,掺铒光纤激光器的脉冲现象。在光纤激光器谐振腔中插入带尾纤的LiNbO3相位调制器,利用低频周期性信号进行相位调制,能够得到重复频率为几十千赫到几百千赫左右的均匀、稳定的脉冲光输出,且发现激光光谱变化等现象。分析表明,这种脉冲现象难以用调Q、锁模等传统的脉冲光理论进行有效地解释。简要讨论了脉冲光产生的物理机制,通过对相位调制与“驰豫振荡”关系的研究,唯象地认为相位调制和“驰豫振荡”是脉冲光产生的原因。

All-Fiber Pulse Laser Based on Intra Cavity Phase Modulation Ⅰ: Experiments

It is found that the Er3+ doped fiber laser is in pulsed state when it is phase modulated at a low frequency. A pigtailed LiNbO3 phase modulator driven by a commercial signal generator was inserted into the fiber laser cavity, regular pulses were achieved in certain conditions and other phenomena such as the change of the laser spectrum were observed. The pulse had a repetition rate from several tens of kHz to several hundreds of kHz. Analysis results have shown that it is hard to be explained by the traditional theories such as Q-switched and mode-locking theory. The mechanism of these phenomena is discussed briefly. Based on the investigation of the relationship between phase modulation and relaxation oscillation, the phase modulation and relaxation oscillation are phenomenologically considered as the reason of the pulsed laser.