Tungsten disulphide for ultrashort pulse generation in all-fiber lasers

Abstract

Tungsten disulphide (WS), which exhibits excellent saturable absorption properties, has attracted much attention in the applications of photonic devices. In this paper, WS is applied for the preparation of a saturable absorber (SA). Using the pulsed laser deposition (PLD) method, WS is deposited on the side surface of the tapered fiber. In order to obtain larger non-linearity of the SAs with evanescent wave interaction, the tapered fiber had a smaller waist diameter and longer fused zone. Gold film was deposited on the fiber-taper WS SAs to improve their reliability and avoid oxidation and corrosion. Employing the balanced twin-detector method, the modulation depth of the fiber-taper WS SAs was measured to be 17.2%. With the fiber-taper WS SA, a generated pulse with 246 fs duration and a 57 nm bandwidth was obtained at 1561 nm. The electrical signal to noise ratio was better than 92 dB. To our knowledge, the pulse duration was the shortest among the reported all-fiber lasers with transition metal dichalcogenide (TMD) SAs. These results indicate that fiber-taper WS SAs with smaller waist diameter and longer fused zone are promising photonic devices for ultrashort pulse generation in all-fiber lasers.

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

“…These efforts have greatly promoted the development of few‐layer MoS 2 in mode‐locked lasers and achieved a lot of important results . Similar to MoS 2 , layered WS 2 also has a direct bandgap and exhibits excellent nonlinear optical properties . For example, the researchers demonstrated the soliton mode‐locked fiber lasers using WS 2 nanosheets, which were prepared by the liquid phase exfoliation and pulsed laser deposition method, respectively, as shown in Figure a–f.…”

Ultra-stable pulse generation in ytterbium-doped fiber laser based on black phosphorus

“…Recently, as saturable absorbers (SAs), two-dimensional (2D) materials such as graphene, 1 carbon nanotubes, 2 transitionmetal dichalcogenides (TMDs), 3,4 and topological insulators (TIs) [5][6][7] have attracted much attention to generate pulse lasers. The passive ways based on SA to produce pulse lasers have the advantages of low cost, easy implementation and compactness.…”

Palladium selenide as a broadband saturable absorber for ultra-fast photonics

“…As is known, the zero-bandgap structure of graphene also brought great obstacles to its optoelectronic device applications. Since then, inspired by graphene, various 2D layered materials including multielemental (transition metal dichalcogenides (TMDs) [30][31][32][33][34][35][36][37][38][39][40][41], topological insulator (TIs) [42][43][44][45][46][47], ferromagnetic insulator (FIs) [48][49][50], metal chalcogenide [51,52], MXenes [53][54][55][56], etc.) and mono-elemental (Xenes (phosphorene [57][58][59][60][61][62][63][64][65][66], graphdiyne [67], antimonene [68], bismuthene [69][70][71], tellurene [72,73]) and selenene [74]) were prepared as mode lockers for obtaining pulsed fiber lasers extensively.…”