PbS Quantum Dots Saturable Absorber for Dual-Wavelength Solitons Generation

Abstract

PbS quantum dots (QDs), a representative zero-dimensional material, have attracted great interest due to their unique optical, electronic, and chemical characteristics. Compared to one- and two-dimensional materials, PbS QDs possess strong absorption and an adjustable bandgap, which are particularly fascinating in near-infrared applications. Here, fiber-based PbS QDs as a saturable absorber (SA) are studied for dual-wavelength ultrafast pulses generation for the first time to our knowledge. By introducing PbS QDs SA into an erbium-doped fiber laser, the laser can simultaneously generate dual-wavelength conventional solitons with central wavelengths of 1532 and 1559 nm and 3 dB bandwidths of 2.8 and 2.5 nm, respectively. The results show that PbS QDs as broadband SAs have potential application prospects for the generation of ultrafast lasers.

Soliton rains with isolated solitons induced by acoustic waves in a nonlinear multimodal interference-based fiber laser

“…In nonlinear optics, ultrafast fiber lasers are an ideal platform for exploring rich nonlinear dynamics, and their performance hinges on the cavity parameters and interaction between linear and nonlinear process. Originating from dissipative and conservative effects, fiber lasers can deliver various types of solitons, for example conventional solitons, dissipative solitons, stretched pulses and trampoline-like pulsating solitons [5][6][7][8][9][10]. In these fiber lasers, a soliton exists in the cavity as a singlet.…”

Synthesis of Hexagonal Structured GaS Nanosheets for Robust Femtosecond Pulse Generation

“…Following the demand for stability and robustness in practical applications, real SA choosing is important [40][41][42][43][44]. GaS is an indirect bandgap semiconductor which possesses a crystal lattice with a hexagonal structure, each layer consisting of two Ga and two S closed-packed sublayers in the stacking sequence of S-Ga-Ga-S along the c axis [45][46][47].…”

Neodymium Oxide (Nd2O3) as Passive Q-switcher for Pulsed Fiber Laser Generation in C-band Region

“…Hence, it was decided to use twodimensional (2D) materials as the saturable absorber and in this research, organic material was used as the saturable absorber as it can be easily obtained, and the discovery of organic material as saturable absorber are quite new and not extensively studied yet. In past years, several types of saturable absorber was discovered which includes zero dimensional (0D) nanomaterials which is quantum dots [7], one-dimensional (1D) which is carbon nanotubes (CNTs), 2D materials such as graphene [8], black phosphorus, transition metal dichalcogenides (TMDs) [9], topological insulators (TIs), and quite recently antimonene, MXenes [10] and organic materials such as spent ground coffee [11]. More recently, other materials such as transition metal oxides (TMOs), metals and metal oxides have also been reported as SA to generate lasers in various regions because they have high-chemical stability.…”