Tunable Q-switched fiber laser based on saturable edge-state absorption in few-layer molybdenum disulfide (MoS_2)
2014; Optica Publishing Group; Volume: 22; Issue: 25 Linguagem: Inglês
10.1364/oe.22.031113
ISSN1094-4087
AutoresRobert I. Woodward, E. J. R. Kelleher, Richard C. T. Howe, Guohua Hu, Felice Torrisi, Tawfique Hasan, С. В. Попов, J. R. Taylor,
Tópico(s)Laser-Matter Interactions and Applications
ResumoWe 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 μs 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.
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