Laser Q-switching with PtS₂ microflakes saturable absorber

Abstract

Numerous studies have been conducted to explore the performance of two-dimensional (2D) layered nano-materials based saturable absorber (SA) for pulsed laser applications. However, fabricating materials in nanoscale requires complicated preparation processes, high energy consumption, and high expertise. Hence, the study of pulsed laser performance based on the saturable absorber prepared by layered materials with bulk-micro size have gained a great attention. Platinum disulfide (PtS), which is newly developed group 10 2D layered materials, offers great potential for the laser photonic applications owing to its high carrier mobility, broadly tunable natural bandgap energy, and stability. In this work, the first passively Q-switched Erbium (Er) doped fiber laser is demonstrated with an operational wavelength of 1568.8 nm by using PtS microflakes saturable absorber, fabricated by a simple liquid exfoliation in N-Methyl-2-pyrrolidone (NMP) and then incorporated into polyvinyl alcohol (PVA) polymer thin film. A stable Q-switched laser operation is achieved by using this PtS-SA within a fiber laser ring cavity. The maximum average output power is obtained as 1.1 mW, corresponding to the repetition rate of 24.6 kHz, the pulse duration of 4.2 μs, and single pulse energy of 45.6 nJ. These results open up new applications of this novel PtS layered material.

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

“…These early efforts have promoted the rapid development of layered materials in Q‐switched lasers. For example, Q‐switched fiber lasers based on layered materials including graphene, topological insulators, TMDCs, and BP, have been obtained, as illustrated in Table . It can be seen that these lasers have excellent performance in output power, pulse width, repetition frequency, and peak power, which is not inferior to the traditional lasers based on semiconductor saturable absorption mirrors and carbon nanotubes.…”

Passively Q-switched Ytterbium-doped fiber laser based on broadband multilayer Platinum Ditelluride (PtTe2) saturable absorber

“…photocatalyst 34 , FETs 33 and photodetectors 35–38 . Additionally, the Q-switched or mode-locked laser pulses generation have been successfully demonstrated by using PtS 2 39,40 and PtSe 2 41–43 based saturable absorber. For the infrared pulsed laser and optical communication application, the functional 2D material with a relatively small bandgap is more suitable for the mainstream laser photonic system 41 .…”

Passively Q-switched Yb-doped all-fiber laser based on Ag nanoplates as saturable absorber

“…In recent years, the investigation of novel high-performance SAs for pulsed laser systems has been a rich and fascinating subject in the field of fiber laser physics, leading to an outburst of publications realized with Q-switched and mode-locked fiber lasers. To date, numerous nanomaterials have been demonstrated as efficient saturable absorption materials for SAs in Q-switched fiber lasers, such as carbon nanotubes [8][9][10], graphene [11][12][13][14], transition-metal dichalcogenides [15][16][17][18], topological insulators [19][20][21], black phosphorus [22][23][24], quantum dots [25,26], MXenes [27], filled skutterudites [28], and transition metal oxides [29][30][31].…”