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采用铒镱共掺光纤,实现了一种双波长1.0μm调Q和1.5μm增益开关脉冲光纤激光器。实验装置是一个双环腔结构,两环的公共端共用一段铒镱共掺光纤。1.0μm调Q脉冲通过未抽运铒镱共掺光纤的可饱和吸收效应产生。而铒镱共掺光纤对1.0μm调Q脉冲的再吸收会周期性调制铒离子的反转粒子数,从而产生重复频率相等的1.5μm增益开关脉冲。随着抽运功率的增加,这两种脉冲的重复频率从5.4kHz增加到11.7kHz。1.5μm脉冲相对1.0μm脉冲有一定的延迟,并且延迟时间随着抽运功率的增大而不断减小。在最大抽运功率处,1.0μm脉冲宽度、单脉冲能量和最大平均输出功率分别是5.3μs、402.6nJ和4.7mW,而对于1.5μm脉冲,分别是4.6μs、374.4nJ和4.4mW。
The erbium-ytterbium co-doped fiber is used to realize a dual-wavelength 1.0μm Q-switched and 1.5μm gain switched pulsed fiber laser. The experimental setup is a double-ring cavity structure with a common erbium-ytterbium codoped fiber common to both rings. A 1.0 μm Q-switched pulse is generated by the saturable absorption effect of an unpumped erbium-ytterbium co-doped fiber. The erbium-ytterbium codoped fiber on the 1.0μm Q-switched pulse re-absorption will periodically modulate the number of inverted particles of erbium ions, resulting in equal repetition frequency of 1.5μm gain switching pulse. As pumping power increases, the repetition rate of these two pulses increases from 5.4 kHz to 11.7 kHz. The 1.5μm pulse has a certain delay with respect to the 1.0μm pulse, and the delay time decreases with the pumping power. At maximum pump power, 1.0 μιη pulse width, single pulse energy and maximum average output power were 5.3 μs, 402.6 nJ and 4.7 mW, respectively, and 4.6 μs, 374.4 nJ and 4.4 mW for 1.5 μιη pulses, respectively.