For an Er-doped fiber laser, for the first time, to the best of our knowledge, we demonstrate both experimentally and theoretically a novel mechanism of harmonic mode-locking based on the electrostriction effect leading to excitation of the torsional acoustic modes in the transverse section of the laser. The exited torsional acoustic modes modulate the fiber birefringence that results in synchronization of oscillations at the harmonic modes and the linewidth narrowing with the increased signal-to-noise ratio of 30 dB. By adjusting the in-cavity birefringence based on tuning the polarization controller, we enable the selection of the harmonic mode to be stabilized.

中文翻译：

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声共振矢量谐波锁模

对于掺铒光纤激光器，据我们所知，我们首次在实验和理论上证明了一种基于电致伸缩效应的谐波锁模新机制，导致横向扭转声模式的激发。激光部分。退出的扭转声学模式调制光纤双折射，导致谐波模式的振荡同步，线宽随着信噪比的增加而变窄，达到 30 dB。通过基于调谐偏振控制器来调整腔内双折射，我们可以稳定谐波模式的选择。