基于石墨烯可饱和吸收被动锁模超快全固体激光器的研究  

Ultrafast Mode-Locked Solid-State Lasers with Graphene Saturable Absorber

作　　者：何京良[1] 郝霄鹏[1] 徐金龙[1] 李先磊[1] 杨英[1] 

机构地区：[1]山东大学晶体材料国家重点实验室,山东济南250100

出　　处：《光学学报》2011年第9期327-331,共5页Acta Optica Sinica

基　　金：国家自然科学基金(11074148);国家自然科学基金重大研究计划(91022003)资助课题

摘　　要：石墨烯具有饱和恢复时间极短、导热性好、吸收带宽、损耗低、成本低廉且容易制备等优点,被认为是光电子应用中理想的半导体可饱和吸收体材料,近几年受到广泛的关注。介绍了本课题组最近在石墨烯锁模超快全固体激光器研究中取得的一些进展。在用液相剥离方法成功制备出尺寸大于20μm的石墨烯薄片的基础上,将其应用于全固态Nd∶GdVO4激光器,实现了脉宽16 ps、平均功率360 mW的锁模激光输出,单脉冲能量为8.4 nJ;继而在宽带增益介质Yb∶KGW晶体中又实现了脉宽为489 fs的超快激光,平均功率564 mW。Graphene has attracted wide attention and been believed to be an ideal saturable absorber due to ultrafast saturation recovery time,wide absorption band,low loss,low cost,easy fabrication,super mechanical properties and high thermal conductivity.This paper presents our progress on grapheme preparation and its application in solid-state lasers.The high-quality graphene sheets with lateral size over 20 μm are obtained by bath-sonicating after processing the worm-like graphite marginally with mixed oxidizer.With graphene as saturable absorber,16 ps pulses have been obtained from the mode-locked Nd：GdVO4 laser,with an average output power of 360 mW and a pulse energy of 8.4 nJ.By employing Yb：KGW crystal as gain medium,we have also obtained 489 fs pulses with an average output power of 564 mW.

关 键 词：激光器 全固态激光器 锁模 石墨烯 

分 类 号：TN248.1[电子电信—物理电子学]