基于石墨烯的1064nm连续锁模超短脉冲激光器

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 1064 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.

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史瑞平, 白杨, 祁媚, 魏洪铎, 任兆玉, 白晋涛西北大学光子学与光子技术研究所，陕西西安 710069. 基于石墨烯的1064nm连续锁模超短脉冲激光器[J]. 应用光学, 2014, 35(1): 159. SHI Rui-ping, BAI Yang, QI Mei, WEI Hong-duo, REN Zhao-yu, BAI Jin-tao. 1064 nm CW mode-locked ultrashort pulse laser based on graphene saturable absorber[J]. Journal of Applied Optics, 2014, 35(1): 159.

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