Abstract
Abstract Transition metal dichalcogenides have been widely utilized as nonlinear optical materials for laser pulse generation applications. Herein, we study the nonlinear optical properties of a VS2-based optical device and its application as a new saturable absorber (SA) for high-power pulse generation. Few-layer VS2 nanosheets are deposited on the tapered region of a microfiber to form an SA device, which shows a modulation depth of 40.52%. After incorporating the microfiber-VS2 SA into an Er-doped fiber laser cavity, passively Q-switched pulse trains could be obtained with repetition rates varying from 95 to 233 kHz. Under the pump power of 890 mW, the largest output power and shortest pulse duration are measured to be 43 mW and 854 ns, respectively. The high signal-to-noise ratio of 60 dB confirms the excellent stability of the Q-switching state. To the best of our knolowdge, this is the first illustration of using VS2 as an SA. Our experimental results demonstrate that VS2 nanomaterials have a large potential for nonlinear optics applications.
Highlights
Nonlinear optical materials, as fundamental components of electronic and optoelectronic devices, play a key role in the field of advanced photonics [1,2,3,4,5,6]
According to the two-level saturable absorption model, the nonlinear optical absorption of the proposed saturable absorber (SA) device is fitted by the following equation: α(I ) = αs 1+ I
VS2 nanosheets coated onto the microfiber form the SA device with the modulation depth of 40.52%
Summary
As fundamental components of electronic and optoelectronic devices, play a key role in the field of advanced photonics [1,2,3,4,5,6]. Two-dimensional (2D) materials are developed for wide applications in the nonlinear optical field because of their attractive photonic characteristics, including ultrafast carrier dynamics, strong light-matter interaction and large modulation depth. Graphene [22], topological insulators (TIs) [23], metal–organic frameworks [24, 25], perovskite [26], MXene [27], group-VA mono-elemental materials [28,29,30], transition metal dichalcogenides (TMDCs) [31, 32], black phosphorus [33,34,35] and IIIA/IVA monochalcogenides [36] have been extensively investigated and confirmed as great alternatives to saturable absorbers (SAs) in pulsed laser systems for ultrashort pulse generation. The group VIB TMDCs (MoS2 and WS2) have been used for pulse generation thoroughly
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