Ultrafast soliton delivered by miniaturized mode-locker with MoTe₂ and core-expanded fiber

Abstract

Thermally expanded core (TEC) technology is an effective method of high-power fiber lasers. Miniaturization is also a major challenge for high-power lasers. We have proposed a miniaturized mode-locker based on TEC fiber and M o T e 2 -polyvinyl alcohol (PVA) film. The proposed mode-locker is consisting of two TEC ferrules, a piece of M o T e 2 -PVA film and a ceramic sleeve. The length of the proposed device is about 20 mm, and its outer diameter is about 2 mm. The relations between heating time, heating temperature, and mode field diameter (MFD) have been numerically simulated. The bending loss with respect to MFD has also been analyzed. The simulation results have revealed the trade-off relation between maximal tolerable intensity and low cavity loss, which means that there is an optimal MFD corresponding to optimal heating time and heating temperature. The proposed mode-locker has been applied in an integrated fiber laser, which has emitted ultrafast soliton with 3 times intensity larger than that of conventional sandwiched-type saturable absorber. The proposed mode-locker and fiber laser will find important applications in laser processing, laser ranging, and optical communication.

Preparation and pulsed fiber laser applications of emerging nanostructured materials

“…17 Since 2014, TMDCs have been widely used as the SA materials for the generation of pulsed lasers in different laser cavities. Other TMDCs such as MoSe 2 , 255 MoTe 2 , 256 WS 2 , 257 WSe 2 , 222 WTe 2 , 210 SnS 2 , 258 ReS 2 , 259 PtS 2 , 260 PtSe 2 , 261 NbSe 2 , 262 TiS 2 , 263 TaS 2 , 264 and HfSe 2 265 have also been used as the SA materials for the generation of pulsed lasers in passively mode-locking fiber lasers. For instance, three kinds of WSe 2 films with thicknesses of about 1.5, 5.7, and 11 nm prepared by the CVD method exhibited different modulation depths of 52.38%, 47.38%, and 34.41%, respectively.…”