标题：Wavelength-Versatile Graphene-Gold Film Saturable Absorber Mirror for Ultra-Broadband Mode-Locking of Bulk Lasers
作者：Ma, Jie; Xie, Guoqiang; Lv, Peng; Gao, Wenlan; Yuan, Peng; Qian, Liejia; Griebner, Uwe; Petrov, Valentin; Yu, Haohai; Zhang, Huaijin 更多 作者机构：[Ma, Jie; Xie, Guoqiang; Gao, Wenlan; Yuan, Peng; Qian, Liejia] Shanghai Jiao Tong Univ, Dept Phys & Astron, Minist Educ, Key Lab Laser Plasmas, Shang 更多
通讯作者地址：[Xie, GQ]Shanghai Jiao Tong Univ, Dept Phys & Astron, Minist Educ, Key Lab Laser Plasmas, Shanghai 200240, Peoples R China.
摘要：An ultra-broadband graphene-gold film saturable absorber mirror (GG-SAM) with a spectral coverage exceeding 1300 nm is experimentally demonstrated for mode-locking of bulk solid-state lasers. Owing to the p-type doping effect caused by graphene-gold film interaction, the graphene on gold-film substrate shows a remarkably lower light absorption relative to pristine graphene, which is very helpful to achieve continuous-wave mode-locking in low-gain bulk lasers. Using the GG-SAM sample, stable mode-locking is realized in a Yb: YCOB bulk laser near 1 mu m, a Tm: CLNGG bulk laser near 2 mu m and a Cr:ZnSe bulk laser near 2.4 mu m. The saturable absorption is characterised at an intermediate wavelength of 1.56 mu m by pump-probe measurements. The as-fabricated GG-SAM with ultra-broad bandwidth, ultrafast recovery time, low absorption, and low cost has great potential as a universal saturable absorber mirror for mode-locking of various bulk lasers with unprecedented spectral coverage.