基于石墨烯的1 064 nm连续锁模超短脉冲激光器

1 064 nm CW mode-locked ultrashort pulse laser based on graphene saturable absorber

摘要: 介绍了利用沉积在增透镜上的石墨烯薄膜作为可饱和吸收体、808 nm激光二极管端面泵浦Nd∶YVO4晶体的1 064 nm连续锁模激光输出特性。采用W型折叠谐振腔结构，在808 nm泵浦功率为8.0 W时，有稳定的连续锁模脉冲输出，平均输出功率达到185 mW；当抽运功率增加到16.0 W时，获得了中心波长1 063.4 nm、脉冲宽度为518 fs、重复频率为66.7 MHz、最大平均输出功率为323 mW的百飞秒量级超短脉冲激光输出。实验结果表明：石墨烯具有优良的可饱和吸收性，在1 064 nm波段能够实现高功率、百飞秒量级连续锁模脉冲激光输出。

Abstract: A 1 064 nm continuous wave (CW) passively mode-locked ultrashort pulse laser based on graphene saturable absorber was reported. The graphene film was deposited on an antireflection lens, the Nd∶YVO4 crystal was pumped by 808 nm laser diode. On the basis of W-folded cavity, the stable pulses of CW mode-locked were obtained with the average output power of 185 mW when the pump power reached 8.0 W. When pump power reached 16.0 W, the 1 064 nm CW mode-locked ultrashort laser with the average output power of 323 mW, the pulse width of 518 fs and the repetition rate of 66.7 MHz was obtained, which spectrum was centered at 1063.4 nm. Experiment results shows that graphene is an excellent saturable absorber for stable and reliable passively mode-locked pulse generation around 1 064 nm wavelength.