A new method to make an all-fiber nonlinear optic device for laser pulse generation is developed by depositing multi-layer graphene oxide (GO) selectively onto the core of the cleaved fiber facet by combining the electrical arc discharge and the laser-driven self-exfoliation. Using the GO colloid droplet with sub-nanoliter volume, we obtained a GO bulk layer deposited on a fiber facet of the order of milliseconds by using an electric arc. The prepared fiber facet was then included in an Er-doped fiber laser (EDFL) cavity and we obtained a few layers of GO having nonlinear optic two-dimensional (2D) characteristics selectively on the fiber core by the laser-driven self-exfoliation. The 2D GO layers on the fiber core served as a stable and efficient saturable absorber enabling robust pulse train generation at λ=1600.5 nm, the longest Q-switched laser wavelength in EDFLs. Pulse characteristics were analyzed as we varied the pump power at λ=980 nm from 105.2 mW to 193.6 mW, to obtain the maximum repetition rate of 17.8 kHz and the maximum output power of 2.3 mW with the minimum pulse duration of 7.8 μs. The proposed method could be further applied to other novel inorganic 2D materials opening a window to explore their novel nonlinear optic laser applications.

中文翻译：

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激光驱动光纤端面上氧化石墨烯层的自剥离，用于在最长波长下实现掺铒光纤激光器的 Q 开关

通过将电弧放电和激光驱动的自发光相结合，将多层氧化石墨烯 (GO) 选择性地沉积到切割的光纤面的核心上，开发了一种制造用于激光脉冲生成的全光纤非线性光学器件的新方法。去角质。使用具有亚纳升体积的 GO 胶体液滴，我们通过使用电弧获得了沉积在几毫秒的纤维面上的 GO 体层。然后将制备的光纤面包含在掺铒光纤激光器 (EDFL) 腔中，我们通过激光驱动的自剥离在光纤芯上选择性地获得了几层具有非线性光学二维 (2D) 特性的 GO。光纤纤芯上的 2D GO 层充当稳定且高效的可饱和吸收器，可在 λ=1600.5 nm 处生成稳健的脉冲序列，EDFL 中最长的 Q 开关激光波长。当我们将 λ=980 nm 的泵浦功率从 105.2 mW 改变到 193.6 mW 时，分析了脉冲特性，以获得 17.8 kHz 的最大重复率和 2.3 mW 的最大输出功率以及 7.8 μs 的最小脉冲持续时间。所提出的方法可以进一步应用于其他新型无机二维材料，为探索其新型非线性光学激光应用打开了一扇窗。