Opt Lett. 2019 Nov 1;44(21):5112-5115. doi: 10.1364/OL.44.005112.
A controllable passive harmonic mode locking (HML) in an erbium-doped fiber laser with a soliton pulse shaping using a single-wall carbon nanotube has been experimentally demonstrated. By increasing the pump power and adjusting the in-cavity polarization controller, we reached the 51st-order harmonic (902 MHz) having the output power of 37 mW. We attribute the observed high-frequency HML to the electrostriction effect caused by periodic pulses and leading to excitation of the radial and torsional-radial acoustic modes in the transverse section of the laser. The exited acoustic modes play the role of the bandpass filter, which stabilizes the high-frequency HML regime.
我们通过实验演示了一种在掺铒光纤激光器中利用单壁碳纳米管对孤子脉冲进行整形来实现可控的被动谐波锁模（HML）。通过增加泵浦功率并调节腔内偏振控制器，我们实现了第 51 阶谐波（902MHz），输出功率为 37mW。我们将观察到的高频 HML 归因于周期性脉冲引起的电致伸缩效应，从而导致激光横截面上的径向和扭转-径向声模被激发。被激发的声模起到带通滤波器的作用，稳定了高频 HML 模式。
