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报道了一种全光纤结构耗散孤子被动锁模光纤激光器。激光器中使用了一种基于多模干涉原理的光纤滤波器,它由两段单模光纤和一段多模光纤组成。通过合理的选取多模光纤的长度,制作了中心波长在1067nm处、3dB带宽为7.5nm的光谱滤波器并将其应用于全正色散被动锁模掺镱光纤激光器中。实验中使用半导体可饱和吸收镜(SESAM)作为锁模元件,在抽运功率为865mW时,获得重复频率为18.5MHz的稳定锁模啁啾脉冲串,脉冲宽度为21ps,平均输出功率为8mW,单脉冲能量为0.43nJ。输出脉冲光谱半峰全宽为4.32nm,光谱边缘有明显陡沿。
An all-fiber structure dissipative soliton passive mode-locked fiber laser is reported. An optical fiber filter based on the principle of multimode interference is used in the laser. It consists of two single-mode optical fibers and a multi-mode optical fiber. By reasonably selecting the length of multimode fiber, a spectral filter with a center wavelength of 1067nm and a 3dB bandwidth of 7.5nm was fabricated and applied to a fully positive dispersion passively mode-locked ytterbium-doped fiber laser. In this experiment, the SOSAM was used as the mode-locked element. When the pumping power was 865mW, a stable mode-locked chirped pulse train with a repetition frequency of 18.5MHz was obtained. The pulse width was 21ps and the average output power was 8mW. Single pulse energy is 0.43nJ. The full width at half maximum of the output pulse spectrum is 4.32 nm with a sharp edge at the edge of the spectrum.