Mode-locking operation of an Er-doped fiber laser with (PEA)2(CsPbBr3)n-1PbBr4 perovskite saturable absorbers

Organic-inorganic hybrid perovskite materials have recently attracted considerable interest owing to their excellent optoelectrical properties, good environmental stability and variety of applications. The quasi-2D perovskites are also expected to have excellent application possibilities in the field of nonlinear optics, due to their distinctive structures and strong nonlinear absorption characteristics. However, ultrashort pulses from a mode-locked laser cavity based on a (PEA)(2)(CsPbBr3)(n-1)PbBr4 saturable absorber (SA) have not yet been reported. In this paper, we demonstrate that (PEA)(2)(CsPbBr3)(n-1)PbBr4 of 2D, quasi-2D and 3D structures exhibit excellent saturable absorption effects. By sandwiching the 2D, quasi-2D and 3D (PEA)(2)(CsPbBr3)(n-1)PbBr4 SAs between two fiber connectors in the Er-doped fiber laser, 17.4 MHz laser pulses with 492 fs, 922 fs and 950 fs pulse widths are obtained, respectively; the corresponding central wavelengths are 1569.5 nm, 1562.0 nm and 1558.8 nm. The experimental results show that the (PEA)(2)(CsPbBr3)(n-1)PbBr4 SA creates strong nonlinear effects, which means that it is a promising SA for the field of ultrafast lasers.

Automated summary

Organic-inorganic hybrid perovskite materials with excellent optoelectrical properties and good environmental stability have promising applications in the field of nonlinear optics. This study demonstrates the excellent saturable absorption effects of 2D, quasi-2D, and 3D (PEA)(2)(CsPbBr3)(n-1)PbBr4 structures. The (PEA)(2)(CsPbBr3)(n-1)PbBr4 SA can generate ultrashort laser pulses in the Er-doped fiber laser, indicating its potential as a saturation absorber for ultrafast lasers.