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利用非线性偏振旋转技术,实现了正色散掺铒光纤激光器的自启动锁模,产生了一种新型的增益诱导孤子脉冲输出.该类型脉冲的光谱近似为矩形,半高全宽光谱宽度可达19 nm以上,脉宽为皮秒量级.增益诱导孤子脉冲的形成是增益饱和、光谱滤波效应、腔内色散和各种非线性效应共同作用的结果.同时还分析了脉冲啁啾特性及峰值功率等参数.当抽运功率增加时,该激光器还可以实现双脉冲模式下运转.
A new type of gain-induced soliton pulse output is obtained by using self-starting mode-locking of a positive-dispersion erbium-doped fiber laser with a non-linear polarization rotation technique. The spectrum of this type of pulse is approximately rectangular with a full width at half maximum of 19 nm , The pulse width is on the order of picoseconds.The gain-induced soliton pulse formation is the result of the combination of gain saturation, spectral filtering, intracavity dispersion and various non-linear effects.At the same time, the chirp characteristics and peak power When the pumping power is increased, the laser can also operate in dual pulse mode.