A passively Q-switched tunable Yb-doped double-clad fiber laser is demonstrated with graphene epitaxially grown on SiC. The spectral tuning of the Q-switched fiber laser is implemented by rotating a quartz plate filter inside the cavity. The central wavelength of the fiber laser can be continuously tuned from 1038.54 to 1056.22 nm. The maximum pulse energy of 0.65 \mu J is obtained at the pump power of 4.08 W, and the corresponding pulse duration and average output power are 1.60 \mu s and 35 mW, respectively.

报道了6H-SiC衬底外延生长的石墨烯作为可饱和吸收体，环形腔结构的全正色散被动锁模掺镱光纤激光器。在注入抽运功率为250 mW时，得到稳定的重复频率为1.05 MHz的自锁模脉冲，平均输出功率为6 mW；当注入抽运功率增加到480 mW时，最大平均输出功率为20 mW，相应的最高单脉冲能量为19 nJ，激光脉冲宽度约为520 ps。