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报道了一种通过预先对信号光脉冲非线性整形,进而在光纤放大器中实现自相似演化的方法.利用透射光栅对和普通单模光纤组成被动脉冲整形装置,预先优化脉冲的时域宽度和光谱质量,使脉冲在光纤放大器中快速演化到自相似子.研究中首先通过数值模拟对比,说明了非线性整形对脉冲实现快速自相似放大的关键作用,提高了放大器输出脉冲质量,减小了去啁啾脉冲宽度.实验中,通过优化非线性整形输出,在2.2m长的掺Yb3+光纤中,在一定抽运功率范围内均实现了脉冲自相似放大,去啁啾后得到脉冲宽度60fs的变换极限脉冲输出.这种非线性脉冲预整形方法有效减小了自相似演化所需光纤长度,同时降低了自相似放大对种子源质量的要求,首次将全正色散光纤锁模激光器成功用于自相似放大,促进了当前自相似放大系统的全光纤化.
A method of nonlinear self-shaping of signal light pulse and self-similar evolution in optical fiber amplifier is reported in this paper.The passive pulse shaping device composed of transmission grating and common single-mode fiber is used to pre-optimize the time domain width and spectrum of pulse Quality, make the pulse evolve into self-similar in fiber amplifier rapidly.Study the key role of non-linear shaping on pulse self-similar amplification by numerical simulation firstly, and improve the output pulse quality of amplifier, Chirped pulse width.In the experiment, by optimizing the nonlinear shaping output, pulse self-similar amplification was achieved in a 2.2 m long Yb3 + -doped fiber with a certain pumping power, and the pulse width 60 fs transform was obtained after chirp elimination Limit pulse output.The nonlinear pulse pre-shaping method effectively reduces the fiber length needed for the self-similar evolution and reduces the requirement of self-similar amplification on the quality of the seed source. For the first time, the all-dispersion fiber mode-locked laser is successfully used in the self- Similar amplification, to promote the current self-similar amplification system full fiber.