One-Step Fabrication of 0D CsPbBr Perovskite with Nonlinear Optical Properties for Ultrafast Pulse Generation.

Low-dimensional lead halide perovskites demonstrate remarkable nonlinear optical characteristics attributed to their distinctive physical structures and electronic properties. Nevertheless, the investigation into their nonlinear optical properties remains in its incipient stages. This study addresses this gap by precisely controlling solvent volumes to synthesize both 0D CsPbBr and CsPbBr/CsPbBr perovskites. Remarkably, as saturable absorbers, both pure CsPbBr and CsPbBr/CsPbBr composites exhibit favorable nonlinear optical properties within the C-band, showcasing modulation depths of 9.22% and 16.83%, respectively. Moreover, for the first time, CsPbBr and CsPbBr/CsPbBr composites have been successfully integrated into erbium-doped fiber lasers to realize the mode-locking operations. The utilization of the CsPbBr/CsPbBr composites as a saturable absorber that enables the generation of conventional soliton mode-locked laser pulses with a pulse duration of 688 fs, and a repetition frequency of 10.947 MHz at a central wavelength of 1557 nm. CsPbBr is instrumental in generating laser pulses at a frequency of 10.899 MHz, producing pulse widths of 642 fs at the central wavelength of 1531.2 nm and 1.02 ps at the central wavelength of 1565.3 nm, respectively. The findings of this investigation underscore the potential utility of 0D CsPbBr and CsPbBr/CsPbBr composites as promising materials for optical modulation within fiber laser applications.