Tunable Q-switched fiber laser based on saturable edge-state absorption in few-layer molybdenum disulfide (MoS2)

被引：314
作者：
Woodward, R. I. [1 ]
Kelleher, E. J. R. [1 ]
Howe, R. C. T. [2 ]
Hu, G. [2 ]
Torrisi, F. [2 ]
Hasan, T. [2 ]
Popov, S. V. [1 ]
Taylor, J. R. [1 ]
机构：
[1] Univ London Imperial Coll Sci Technol & Med, Dept Phys, Femtosecond Opt Grp, London SW7 2AZ, England
[2] Univ Cambridge, Cambridge Graphene Ctr, Cambridge CB3 0FA, England
来源：
OPTICS EXPRESS | 2014年 / 22卷 / 25期
基金：
英国工程与自然科学研究理事会;
关键词：
TRANSITION-METAL DICHALCOGENIDES; LIQUID-PHASE EXFOLIATION; OPTICAL-ABSORPTION; LARGE-AREA; GRAPHENE; ABSORBER; NONLINEARITIES;
D O I：
10.1364/OE.22.031113
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We fabricate a few-layer molybdenum disulfide (MoS2) polymer composite saturable absorber by liquid-phase exfoliation, and use this to passively Q-switch an ytterbium-doped fiber laser, tunable from 1030 to 1070 nm. Self-starting Q-switching generates 2.88 mu s pulses at 74 kHz repetition rate, with over 100 nJ pulse energy. We propose a mechanism, based on edge states within the bandgap, responsible for the wideband nonlinear optical absorption exhibited by our few-layer MoS2 sample, despite operating at photon energies lower than the material bandgap. (C) 2014 Optical Society of America
引用
收藏
页码：31113 / 31122
页数：10
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