用于块状激光器超宽带锁模的波长可调谐石墨烯-金膜可饱和吸收镜。

Wavelength-versatile graphene-gold film saturable absorber mirror for ultra-broadband mode-locking of bulk lasers.

机构信息

Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009, China.

出版信息

Sci Rep. 2014 May 23;4:5016. doi: 10.1038/srep05016.

DOI:10.1038/srep05016

PMID:24853072

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4031483/

Abstract

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 μm, a Tm:CLNGG bulk laser near 2 μm and a Cr:ZnSe bulk laser near 2.4 μm. The saturable absorption is characterised at an intermediate wavelength of 1.56 μm 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.

摘要

实验演示了一种超宽带的石墨烯-金膜可饱和吸收镜（GG-SAM），其光谱覆盖范围超过 1300nm，可用于体块固态激光器的锁模。由于石墨烯-金膜相互作用导致的 p 型掺杂效应，金膜基底上的石墨烯的光吸收明显低于原始石墨烯，这对于在低增益体块激光器中实现连续波锁模非常有帮助。使用 GG-SAM 样品，在近 1μm 的 Yb:YCOB 体块激光器、近 2μm 的 Tm:CLNGG 体块激光器和近 2.4μm 的 Cr:ZnSe 体块激光器中实现了稳定的锁模。通过泵浦探测测量，在中间波长 1.56μm 处对可饱和吸收进行了特性分析。所制备的 GG-SAM 具有超宽的带宽、超快的恢复时间、低吸收和低成本，有望成为一种通用的可饱和吸收镜，用于前所未有的光谱覆盖范围内的各种体块激光器的锁模。