Passively mode-locked Er-doped fiber laser with a semiconductor saturable absorber mirror
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摘要: 为了研究基于半导体可饱和吸收镜的被动锁模光纤激光器的输出特性,采用1480nm的半导体激光器作为抽运源,利用掺铒光纤作为增益介质,以及光纤环行器、偏振控制器、波分复用器和耦合器等构成了环形腔结构的被动锁模光纤激光器。实验中获得了峰值波长1586nm、光谱宽度4.8nm、重复频率11.2MHz、最大平均输出功率8.4mW的稳定锁模激光脉冲输出。结果表明,调整光纤偏振控制器会使光纤激光器输出脉冲的时域波形略微发生变化,在实际应用中需要注意偏振态变化对锁模光纤激光器输出脉冲时域特性的影响。这一结果对于半导体可饱和吸收镜在被动锁模光纤激光器中的应用及其特性具有一定帮助。Abstract: The output characteristics of a passively mode-locked erbium-doped ring fiber laser with a semiconductor saturable absorber mirror were studied. This ring fiber laser was constructed with a 1480nm laser diode as pump source, erbium-doped fiber as gain medium, as well as circular, polarization controller, wavelength division multiplexier and coupler. In experiments, the fiber laser operated stably with mode-locked pulse laser output, whose peak wavelength of 1586nm, spectrum width of 4.8nm, repetition frequency of 11.2MHz and maximum mean optical power of 8.4mW. It was found that the characteristics of the output laser pulse in time domain would change a little while adjusting the polarization controller in experiments. Hence, the effect of the polarization change in the fiber laser on characteristics of the output laser pulse should be paid attention to in practical utilization. The experimental results are helpful to the use of semiconductor saturable absorber mirror in passively mode-locked fiber lasers.
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