Mo_0.5W_0.5S₂for Q-switched pulse generation in ytterbium-doped fiber laser

Abstract

In this work, we fabricate the MoWS by microwave-assisted solvothermal method, and report the Q-switched Yb-doped fiber lasers (YDFL) using MoWS polymer film and tapered fiber as the saturable absorbers (SAs). The modulation depth and saturable intensity of the film SA are 5.63% and 6.82 MW cm. The shortest pulse duration and the maximum single pulse energy are 1.22 μs and 148.8 nJ for the film SA, 1.46 μs and 339 nJ for the fiber-taper SA. To the best of our knowledge, this is the first report on the Q-switched YDFL using MoWS SAs.

Progress on Two-Dimensional Transitional Metal Dichalcogenides Alloy Materials: Growth, Characterisation, and Optoelectronic Applications

“…A higher pulse energy of 339 nJ and pulse width of 1.46 µs and a higher pulse energy of 339 nJ and pulse width of 1.46 µs were also obtained with the fibre-taper Mo 0.5 W 0.5 S 2 SA. In addition, they compared Mo 0.5 W 0.5 S 2 SA with MoS 2 and WS 2 SA, and Mo 0.5 W 0.5 S 2 SA had a narrower pulse width and was superior in terms of single-pulse energy [13]. Ahmad et al were able to generate stable Q-switched pulses in the 1.0 µm, 1.5 µm, and 2 µm regions using MoWSe 2 alloy as an all-fibre passively Q-switched Yb-, Er-, and Tm-doped fibre laser.…”

“…These attributes either remain absent in the original TMD materials or exhibit an elevated degree of excellence [1][2][3][4][5]. Their vibrational modes and photoluminescence peaks are affected by the alloying engineering, and this attribute provides a new direction for the application of 2D TMDs alloy materials in hydrogen evolution reaction (HER) [6][7][8], field-effect transistors (FET) [9,10], lithium-sulphur battery catalysis [11,12], and lasers [13,14]. As the exploration of alloyed 2D TMD materials advances, its role in substantiating prospective strides in multifunctional materials for ensuing generation technologies becomes a discernible projection.…”

Recent advances in mode-locked fiber lasers based on two-dimensional materials

“…SA incorporation methods: (a) sandwiching SA between two connectors, (b) depositing SAs on tapered fiber, (c) coating SAs on side-polished fiber, and (d) filling SA into hollow photonic crystal fibers (PCFs). (a)[131], (b)[128], (c)[129], (d)[132].…”

Nonlinear optical properties and Q-switched laser application of a novel Mo0.5Re0.5S2 ternary alloy material at 2 μm

“…Recently, ternary alloy materials have provided a simple and accurate method to customize the bandgap structure of TMDs, turning them into excellent broadband SAs. 14,15) Their particular optical properties have generated many research ideas. The band gap of ternary TMDs alloy materials can not only be controlled by the number of layers but can also be adjusted by tuning the concentration of the metallic element (M x M′ 1−x X 2 ) or the chalcogen element (MX′ 2x X 2(1−x) ).…”

“…Recently, Wang et al demonstrated the nonlinear SA properties of an Mo 0.5 W 0.5 Se 2 alloy and its application to Tmdoped fiber lasers. 15) In 2019, Zhang et al demonstrated that the modulation depth of the ternary alloy ReS 1.02 Se 0.98 is as high as 39.9% at 2 μm, which is much higher than ReSe 2 (7.3%) and ReS 2 (3.9%), and it is used as a SA to the generation of ultrafast lasers by passively mode-locked technology at 2 μm. 11,21,22) These works have the significance to promote the application of ternary alloy materials in pulsed lasers as SAs.…”