200-fs mode-locked Erbium-doped fiber laser by using mechanically exfoliated MoS_2 saturable absorber onto D-shaped optical fiber

Abstract

For the first time, we demonstrated the fabrication of mechanically exfoliated molybdenum disulfide (MoS₂) samples deposited onto a D-shaped optical fiber. The MoS₂ exfoliated flakes were deposited onto a stacked of 1.2 µm PVA (polyvinyl alcohol) and 300 nm PMMA (polymethyl methacrylate) layers and then transferred directly onto a side polished surface of D-shaped optical fiber with polishing length of 17 mm and no distance from the fiber core. The sample exhibited a high polarization performance as a polarizer with relative polarization extinction ratio of 97.5%. By incorporating the sample as a saturable absorber in the Erbium-doped fiber laser (EDFL), bandwidth of 20.5 nm and pulse duration of 200 fs were generated, which corresponded to the best mode-locking results obtained for all-fiber MoS₂ saturable absorber at 1.5 µm wavelength.

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

“…In 2014, another group of researchers further revealed its broadband saturable absorption and applied it to fiber lasers, realizing soliton mode‐locking, as shown in Figure d–f. 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 .…”

“…These efforts have greatly promoted the development of few-layer MoS 2 in mode-locked lasers and achieved a lot of important results. [258][259][260][261][262][263][264][265] Similar to MoS 2 , layered WS 2 also has a direct bandgap and exhibits excellent nonlinear optical properties. [266][267][268][269][270][271][272][273][274][275][276] For example, the researchers demonstrated the soliton mode-locked fiber lasers using WS 2 nanosheets, which were prepared by the liquid phase exfoliation [266] and pulsed laser deposition method, [267] respectively, as shown in Figure 10af.…”

Excessively tilted fiber grating based Fe3O4 saturable absorber for passively mode-locked fiber laser

“…One common method is applying optical devices with special physical structure that can leak out a fraction of laser field which propagates in the form of evanescent wave. Researchers have focused on tapered-fibers [29,30], D-shaped fibers [31,32], fiber microchannels [33,34] and hollow-core fibers [35]. All these devices have been proved to be effective schemes for integration and employed in most SAs.…”

Composite material hollow core fibers: functionalization with silicon and 2D materials

“…The power guided down the fiber was modulated by the humidity of the surrounding area, with a quick response time. MoS2 and WS2 have also been seen to be good saturable absorbers in fiber lasers in passive modelocking and Q-switching regimes 7,10 . Usually these are fabricated by TMDC layer transfer onto the fiber.…”