Tunable Q-switched fiber laser based on saturable edge-state absorption in few-layer molybdenum disulfide (MoS₂).
Change log
Authors
Woodward, RI
Kelleher, EJR
Howe, RCT
Hu, Guohua https://orcid.org/0000-0001-9296-1236
Torrisi, Felice https://orcid.org/0000-0002-6144-2916
Abstract
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 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.
Description
Keywords
Lasers, fiber, Lasers, Q-switched, Nanomaterials, Nonlinear optical materials
Journal Title
Opt Express
Conference Name
Journal ISSN
1094-4087
1094-4087
1094-4087
Volume Title
22
Publisher
The Optical Society
Publisher DOI
Sponsorship
Engineering and Physical Sciences Research Council (EP/G037221/1)
EJRK acknowledges support from the Royal Academy of Engineering (RAEng), through a
RAEng Fellowship, RCTH from EPSRC (EP/G037221/1), GH from a CSC Cambridge International
Scholarship, and TH from the RAEng (Graphlex). The authors also acknowledge
ThorLabs for access to their technical drawings.