标题：Sapphire-based graphene saturable absorber for long-time working femtosecond lasers
作者：S. C. Xu;B. Y. Man;S. Z. Jiang;D. J. Feng;S. B. Gao;C. S. Chen;M. Liu;C. Yang;C. Zhang;D. Bi;F. Y. Liu;X. Meng
作者机构：[Xu, S.C] College of Physics and Electronics, Shandong Normal University, Jinan 250014, China;[ Man, B.Y] College of Physics and Electronics, Shandong 更多
通讯作者地址：[Man, BY]Shandong Normal Univ, Coll Phys & Elect, Jinan 250014, Peoples R China.
摘要：We report a long-time working femtosecond laser using metal-free sapphire-based graphene as a saturable absorber (SA). The sapphire-based graphene yielded excellent nonlinear saturable absorption properties and was demonstrated to be suitable as an SA for an ultrafast solid-state laser. Stable mode-locked pulses of 325 fs were obtained at a central wavelength of 1032 nm with a repetition rate of 66.3 MHz. At pump power of 8.23 W the average output power was 1.78 W and the highest pulse energy reached 26.8 nJ with a peak power of 72.6 kW. Our work opens up a facile route for making reliable graphene SA in the mode-locking technique and also displays an exciting prospect in making low-cost and ultrafast lasers.