Journal
JOURNAL OF MODERN OPTICS
Volume 66, Issue 11, Pages 1163-1171Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340.2019.1609612
Keywords
Saturable absorber; transition metal dichalcogenides; Q-switching; thulium; holmium-doped fibre
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Funding
- Ministry of Higher Education, Malaysia (MOHE) [LRGS (2015)/NGOD/UM/KPT, GA 010-2014 (ULUNG)]
- Universiti Malaya [RU013-2018]
- PRC HiCoE Second Phase Funding
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In this work, a passively Q-switched Thulium/Holmium-doped fibre laser (THDFL) using a molybdenum tungsten disulphide (MoWS2) saturable absorber (SA) is proposed and demonstrated. The MoWS2 nanosheets are prepared by hydrothermal exfoliation and then suspended in a polyvinyl alcohol (PVA) thin film host. Q-switching of the THDFL at a maximum 1550 nm pump power of 445.2 mW gives a maximum repetition rate and minimum pulse width of 36.3 kHz and 2.8 mu s with a corresponding pulse energy of 86.4 nJ and peak power of 31.1 mW. The MoWS2 based Q-switched THDFL's output has a very high signal-to-noise value of approximate to 62.2 dB which strongly indicates that the laser is working in a stable operation. To the best of our knowledge, this is the first demonstration of MoWS2 as a passive SA in a THDFL for operation in the 2.0 mu m region. The proposed laser would have significant medical and sensing applications, particularly at the biologically active 2.0-2.1 mu m regions.
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