Zhang Baofu, Ma Shanchao, Lu Sihua, He Qiurun, Guo Jing, Jiao Zhongxing, Wang Biao
Opt Lett. 2020 Nov 1;45(21):6050-6053. doi: 10.1364/OL.410610.
We theoretically and experimentally demonstrate a novel, to the best of our knowledge, mode-locked ytterbium-doped fiber laser with a saturable absorber based on the nonlinear Kerr beam cleanup effect. The saturable absorber was formed by a 2-m graded-index multimode fiber, and a single-mode fiber segment served as a diaphragm. With an all-normal-dispersion-fiber configuration, the laser generated dissipative soliton pulses with pulse duration of 26.38 ps and pulse energy more than 0.25 nJ; output pulses could be compressed externally to 615.7 fs. Moreover, the self-starting mode-locking operation of this laser exhibited a high stability with a measured signal-to-noise ratio of 73.4 dB in the RF spectrum.
据我们所知，我们从理论和实验上证明了一种基于非线性克尔光束净化效应的新型锁模掺镱光纤激光器，该激光器带有一个可饱和吸收体。可饱和吸收体由一段2米长的渐变折射率多模光纤构成，而一段单模光纤段用作光阑。在全正色散光纤配置下，该激光器产生了脉宽为26.38皮秒且脉冲能量超过0.25纳焦的耗散孤子脉冲；输出脉冲可以在外部被压缩至615.7飞秒。此外，该激光器的自启动锁模操作表现出高稳定性，在射频频谱中测得的信噪比为73.4分贝。
