利用高分子聚合物聚乙烯醇(PVA)易成膜且机械性能优良的特点,将微米尺寸的石墨烯薄片制成大尺寸的石墨烯-PVA薄膜。分别测量了石墨烯-PVA薄膜与石墨烯片的拉曼光谱,发现二者具有同样的特征。研制了用该石墨烯-PVA薄膜作为饱和吸收体,具有环形腔结构的被动锁模掺铒光纤激光器,获得了峰值波长1532.75 nm,重复频率8.7 MHz,脉冲宽度10.29 ps的脉冲序列。 Polyvinyl alcohol (PVA) polymer film is easy to film and excellent mechanical properties, the micron-size graphene sheets made of large-size graphene-PVA film. The Raman spectra of graphene-PVA films and graphene sheets were measured and found to have the same characteristics. A passive mode-locked Erbium-doped fiber laser with a ring cavity structure and a graphene-PVA film as a saturable absorber was developed. The pulse sequence with a peak wavelength of 1532.75 nm, a repetition frequency of 8.7 MHz and a pulse width of 10.29 ps was obtained.