Dual-wavelength mode-locked fiber laser based on tungsten disulfide saturable absorber

Abstract

We report on the generation of dual-wavelength mode-locked laser pulse in an Er-doped ring-shaped fiber cavity with WS 2 nanosheets based saturable absorber (SA), emitting at wavelength of 1531.8 nm and 1556.7 nm. The WS 2 nanosheets were precipitated on the head face of fiber patch cord via light precipitation method. By adjusting the polarization of lasing mode, the gain of the Er-doped fiber laser was effectively controlled and the stable dual-wavelength mode-locking operation was achieved. Our investigation revealed WS 2 's extraordinary nonlinear properties, which make it an excellent material for saturable absorber for passively mode-locked fiber lasers.

Dual-Wavelength Passively Mode-Locked Yb-Doped Fiber Laser Based on a SnSe2-PVA Saturable Absorber

“…The stability of other three kinds of fundamental frequency pulses were similarly tested, and similar phenomena were observed. The mode-locked pulses could not exist if the SA was removed from the laser cavity and only Table 1 demonstrated the parameters of dual-wavelength (or multi-wavelength) passively Q-switched and mode-locked fiber lasers based on various 2D materials SAs, such as graphene [32], [45], SWNTs (single-walled carbon nanotubes) [33], [44], TMO (transition metal oxide) [34]- [36], BP (black phosphorus) [37], LMDCs [28], [38], [40] and TI (topological insulator) [39], [41]- [43], etc. Obviously, compared with other 2D materials SAs, there were narrow pulse width, high slope efficiency and low threshold in our experimental results.…”

Target Acquisition for Collimation System of Wireless Quantum Communication Networks in Low Visibility

“…In the detection regime of target acquisition, in 2014, Wei Bin, Wang Wei and others designed a pseudo-random code laser fuze, using its own autocorrelation to achieve ranging and anti-interference performance [16]. In 2017, Li Zheng, Wang Feng and others proposed dual-wavelength laser fuzes-that is, the use of two wavelength radiation sources of violet and infrared light for target acquisition [17]. Duan Yabo proposed the detection technology of frequency-modulated continuous-wave (FMCW) laser and radio combination fuzes, studied the anti-interference theory of composite fuzes in a complex environment and the theory of height acquisition of targets in the detection area, gave full play to the advantages of the two detection regimes and improved composite fuze anti-interference capability [18].…”

Passively Q-switched fibre laser based on a saturable absorber of siloxane

“…Short pulse fiber lasers are of great interest in various applications, and have attracted much attention due to their extensive applications in optical communication, metrology sensing, material processing, and others [1]. Mode-locked [2][3] lasers and Q-switched [4][5] lasers are two widely used mechanisms used to obtain short pulses. The Q-switched method is effective for generating short pulses with high-energy fiber lasers, and it can be realized either in an active or a passive way.…”