报道了一种基于石墨烯可饱和吸收体的被动调Q光纤激光器。配制了以邻二氯苯（DCB）为溶剂，以石墨烯、聚乙烯醇（PVA）、聚甲基丙烯酸甲酯（PMMA）为溶质的溶液。采用光诱导沉积法将石墨烯吸附于光纤端面，并将其作为可饱和吸收体构建到光纤激光器环形腔中。在掺铒光纤放大器（EDFA）功率为4 mW时即可输出稳定的调Q脉冲，在1564 nm处获得脉冲重复频率、脉宽、单脉冲能量、脉冲峰值功率随EDFA功率变化连续可调的稳定输出。当脉冲重复频率为28 kHz时获得了最大82.4 nJ的单脉冲能量、最大25.1 mW的脉冲峰值功率和最小3 μs的脉冲宽度。此激光器还具有长时间稳定运转的能力。

A passively Q-switched pulse fiber laser based on graphene saturable absorber is reported. Graphene, polyvinyl alcohol (PVA) with polymethyl methacrylate (PMMA) are mixed as solute and dispersed in the 2-dichlorobenzene (DCB) solvent. The graphene film is on the end face of single mode fiber by using optically driven deposition and introduced in a ring cavity fiber laser as an optically saturable absorber. The stable Q-switched operation is initiated with erbium doped fiber amplifier (EDFA) power of 4 mW. When the central wavelength is 1564 nm, the stable pulse sequence with repetition rate, pulse duration, single pulse energy and pulse peak power continuously switchable with the change of the EDFA power is generated by the passively Q-switched pulse fiber laser. The maximum single pulse energy is 82.4 nJ and the maximum pulse peak power is 25.1 mW at the pulse repetition rate of 28 kHz. Meanwhile, the minimum pulse duration of 3 μs is obtained. This fiber laser also has the ability of long time stable operation.