Monolayer Graphene as a Saturable Absorber in a Mode-Locked Laser  

作　　者：Qiaoliang Bao Han Zhang Zhenhua Ni Yu Wang Lakshminarayana Polavarapu Zexiang Shen Qing-Hua Xu Dingyuan Tang Kian Ping Loh 

机构地区：[1]Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore [2]School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore [3]School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore [4]These authors contributed equally to this work.

出　　处：《Nano Research》2011年第3期297-307,共11页纳米研究（英文版）

摘　　要：We demonstrate that the intrinsic properties of monolayer graphene allow it to act as a more effective saturable absorber for mode-locking fiber lasers when compared to multilayer graphene. The absorption of monolayer graphene can be saturated at lower excitation intensity compared to multilayer graphene, graphene with wrinkle-like defects, or functionalized graphene. Monolayer graphene has a remarkably large modulation depth of 65.9%, whereas the modulation depth of multilayer graphene is greatly reduced due to nonsaturable absorption and scattering loss. Picosecond ultrafast laser pulses （1.23 ps） can be generated using monolayer graphene as a saturable absorber. Due to the ultrafast relaxation time, larger modulation depth and lower scattering loss of monolayer graphene, it performs better than multilayer graphene in terms of pulse shaping ability, pulse stability, and output energy.我们证明单层 graphene 的内在的性质允许它当时，为锁模式的纤维激光充当一个更有效的可饱和的吸收器与多层的 graphene 相比。单层 graphene 的吸收能与多层的 graphene，有像皱纹的缺点的 graphene，或 functionalized graphene 相比在更低的刺激紧张被浸透。单层 graphene 有 65.9% 的显著地大的调整深度，而多层的 graphene 的调整深度极大地由于 nonsaturable 吸收被减少并且散布损失。微微秒 ultrafast 激光脉搏(1.23 ps ) 能作为一个可饱和的吸收器用单层 graphene 被产生。由于 ultrafast 松驰时间，更大的调整深度和单层 graphene 的更低的散布损失，它以塑造能力，脉搏稳定性，和产量精力的脉搏比多层的 graphene 更好表现。

关 键 词：GRAPHENE saturable absorber LASER carrier dynamics ultrafast photonics 

分 类 号：TN248[电子电信—物理电子学] TQ127.11[化学工程—无机化工]