Institute of Optoelectronic Technology, Department of Electronic Engineering, Xiamen University, Xiamen 361005, China.
Opt Lett. 2010 Nov 1;35(21):3709-11. doi: 10.1364/ol.35.003709.
We demonstrate a compact Q-switched dual-wavelength erbium-doped fiber (EDF) laser based on graphene as a saturable absorber (SA). By optically driven deposition of graphene on a fiber core, the SA is constructed and inserted into a diode-pumped EDF laser cavity. Also benefiting from the strong third-order optical nonlinearity of graphene to suppress the mode competition of EDF, a stable dual-wavelength Q-switching operation has been achieved using a two-reflection peak fiber Bragg grating as the external cavity mirror. The Q-switched EDF laser has a low pump threshold of 6.5 mW at 974 nm and a wide range of pulse-repetition rate from 3.3 to 65.9 kHz. The pulse duration and the pulse energy have been characterized. This is, to the best of our knowledge, the first demonstration of a graphene-based Q-switched laser.
我们展示了一种基于石墨烯的紧凑型 Q 开关双波长掺铒光纤（EDF）激光器，作为可饱和吸收体（SA）。通过在光纤芯上进行光驱动的石墨烯沉积，构建了 SA 并将其插入到二极管泵浦 EDF 激光腔中。此外，由于石墨烯具有很强的三阶光学非线性，可以抑制 EDF 的模式竞争，因此使用双反射峰值光纤布拉格光栅作为外腔镜，实现了稳定的双波长 Q 开关操作。Q 开关 EDF 激光器在 974nm 时的泵浦阈值低至 6.5mW，脉冲重复率范围很宽，为 3.3 至 65.9kHz。已经对脉冲持续时间和脉冲能量进行了表征。据我们所知，这是首次展示基于石墨烯的 Q 开关激光器。
