State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China.
Opt Lett. 2012 Aug 1;37(15):3021-3. doi: 10.1364/OL.37.003021.
We experimentally explored the influence of passive harmonic mode locking on the temporal and spectral features of a ytterbium-doped fiber laser. Similar dependences of free-running linewidth of the laser carrier-envelope offset frequency (f0) on the intracavity net dispersion were observed for the fundamental-, second-, and third-order mode-locking states. Due to the reduction of nonlinear effects and supermode phase locking that balanced the third-order dispersion in the fiber cavity, the third-order harmonic mode-locking exhibited the narrowest free-running f0 linewidth of ~120 kHz in the near-zero net dispersion regime.
我们实验研究了被动谐波锁模对掺镱光纤激光器的时间和光谱特性的影响。对于基频、二次和三次锁模状态，观察到激光载波包络频偏(f0)的自由运行线宽与腔内净色散的相似依赖性。由于非线性效应的减少和超模相位锁定，平衡了光纤腔中的三阶色散，三阶谐波锁模在近零净色散区域表现出最窄的自由运行 f0 线宽约 120 kHz。
