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中文摘要：
研究了一种基于半导体可饱和吸收镜（SESAM）锁模的线性腔掺镱光纤激光器，其工作在全正色散区域。实验中通过调节偏振控制器和抽运功率，观察到三种不同的锁模状态。除了相同的重复频率（基频435.6kHz），三种锁模状态的光谱、脉冲形状以及随抽运功率变化的演化过程均具有较大差异，其中状态一具有对称加宽的类高斯形光谱；状态二具有非对称加宽的平顶光谱；状态三的脉冲宽度随抽运功率增加急剧增大，脉冲特性类似于耗散孤子，但光谱与之不同。
英文摘要：
An all-normal-dispersion ytterbium-doped linear-cavity fiber laser mode-locked by a semiconductor saturable absorber mirror （SESAM） is reported. Without anomalous dispersion part, output pulses are highly-chirped and fundamental repetition rate is 435. 6 kHz. Three mode-locking states are observed by adjusting polarization controller and pump power. Characters of these states, such as spectrum, pulse shape and stability, are analyzed in control experiments.
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