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Passively Q-switched and mode-locked erbium doped fiber laser based on N-doped graphene saturable absorber

机译:基于N掺杂石墨烯可饱和吸收器的被动Q开关和模式锁定铒掺杂光纤激光器

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摘要

A passively Q-switched and mode-locked erbium-doped fiber laser based on a nitrogen-doped graphene saturable absorber is demonstrated. The N-doped graphene based saturable absorber has a modulation depth of 37.88% and a saturation intensity of 0.016 73 MW cm(-2). By integrating the N-doped graphene saturable absorber into the laser cavity, a stable Q-switched operation with a centre wavelength of 1561.1 nm is obtained with a pulse energy of up to 29.0 nJ. As the pump power increases, the Q-switching operation transits into a mode-locking operation. The mode-locking operation is achieved with a centre wavelength of 1560 nm, a pulse width of 0.98 ps, a repetition rate of 28.5 MHz and a signal to noise ratio of up to 40 dB in the RF spectrum.
机译:证明了一种基于氮掺杂石墨烯饱和吸收器的被动Q开关和模式锁定的掺铒光纤激光。 基于N掺杂的石墨烯的可饱和吸收剂的调节深度为37.88%,饱和强度为0.016 73mW cm(-2)。 通过将N掺杂的石墨烯饱和吸收剂集成到激光腔中,通过高达29.0 nJ的脉冲能量获得具有1561.1nm的中心波长的稳定的Q开关操作。 随着泵功率的增加,Q开关操作转移到模式锁定操作中。 以1560nm的中心波长,脉冲宽度为0.98ps的脉冲宽度,重复率为28.5MHz的脉冲宽度,并且在RF光谱中的信噪比高达40dB的信号。

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