Cheng Huihui, Wang Wenlong, Zhou Yi, Qiao Tian, Lin Wei, Xu Shanhui, Yang Zhongmin
Opt Express. 2017 Oct 30;25(22):27646-27651. doi: 10.1364/OE.25.027646.
A passively mode-locked Yb-doped fiber laser with a fundamental repetition rate of 5 GHz and wavelength tunable performance is demonstrated. A piece of heavily Yb-doped phosphate fiber with a high net gain coefficient of 5.7 dB/cm, in conjunction with a fiber mirror by directly coating the SiO/TaO dielectric films on a fiber ferrule is exploited for shortening the laser cavity to 2 cm. The mode-locked oscillator has a peak wavelength of 1058.7 nm, pulse duration of 2.6 ps, and the repetition rate signal has a high signal-to-noise ratio of 90 dB. Moreover, the wavelength of the oscillator is found to be continuously tuned from 1056.7 to 1060.9 nm by increasing the temperature of the laser cavity. Simultaneously, the repetition rate correspondingly decreases from 4.945874 to 4.945496 GHz. Furthermore, the long-term stability of the mode-locked operation in the ultrashort laser cavity is realized by exploiting temperature controls. This is, to the best of our knowledge, the highest fundamental pulse repetition rate for 1-μm mode-locked fiber lasers.
展示了一种具有5 GHz基本重复频率和波长可调性能的被动锁模掺镱光纤激光器。利用一段具有5.7 dB/cm高净增益系数的重掺镱磷酸盐光纤，结合通过在光纤插芯上直接涂覆SiO/TaO介电膜制成的光纤镜，将激光腔缩短至2 cm。锁模振荡器的峰值波长为1058.7 nm，脉冲持续时间为2.6 ps，重复频率信号具有90 dB的高信噪比。此外，通过提高激光腔的温度，发现振荡器的波长可在1056.7至1060.9 nm范围内连续调谐。同时，重复频率相应地从4.945874 GHz降至4.945496 GHz。此外，通过温度控制实现了超短激光腔内锁模操作的长期稳定性。据我们所知，这是1μm锁模光纤激光器的最高基本脉冲重复频率。
