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研制了一种基于掺Yb3+的双包层大模场面积偏振光子晶体光纤的耗散孤子锁模激光器.利用数值模拟分析了光纤激光器中耗散孤子动力学过程,与全正色散锁模激光器相比,脉冲窄化机理更加丰富,半导体可饱和吸收镜(SESAM)的非线性吸收,啁啾脉冲的光谱滤波以及光纤的增益色散同时起作用,这些因素使耗散孤子锁模更加容易实现,并且稳定运行.其中,光谱滤波的耗散过程是稳定锁模机制的主导因素,滤波片能够在频域和时域同时窄化脉冲,并且去除脉冲啁啾,限制脉冲在腔内始终小于1ps.在实验上实现了无色散补偿腔中直接输出脉冲宽度777fs,最高平均功率达到1W,重复频率48·27MHz,对应单脉冲能量20nJ的飞秒激光.
A dissipative soliton mode-locked laser based on Yb3 + -doped double-clad macroscopic mode-field polarized photonic crystal fiber is developed.The dynamics of dissipative soliton in fiber laser is analyzed by numerical simulation, The pulse narrowing mechanism is more abundant, the nonlinear absorption of the SESAM, the spectral filtering of the chirped pulse and the gain dispersion of the fiber also work at the same time, which makes the dissipative soliton mode-locking easier and Which is the dominant factor in the stable mode-locking mechanism. The filter can narrow the pulse simultaneously in frequency and time domain, and remove the pulse chirp. The limit pulse is always less than 1 ps in the cavity. At Experimentally, a direct output pulse width of 777fs without dispersion compensation cavity, a maximum average power of 1W and a repetition frequency of 48.27MHz, corresponding to a single-pulse energy of 20nJ femtosecond laser was achieved experimentally.