Abstract
Hybrid organic-inorganic perovskite shows a great potential in the field of photoelectrics. Embedding methyl ammonium lead bromide (MAPbBr(3)) in a mesoporous silica (mSiO(2)) layer is an effective method for maintaining optical performance of MAPbBr(3) at room temperature. In this work, we synthesized MAPbBr(3) quantum dots, embedding them in the mSiO(2) layer. The nonlinear optical responses of this composite thin film have been investigated by using the Z-scan technique at a wavelength of 800 nm. The results show plural nonlinear responses in different intensities, corresponding to one- and two-photon processing. Our results support that composites possess saturation intensity of ~27.29 GW/cm(2) and varying nonlinear coefficients. The composite thin films show high stability under ultrafast laser irradiating. By employing the composite as a saturable absorber, a passively Q-switching laser has been achieved on a Nd:YVO(4) all-solid-state laser platform to generate a laser at ~1 μm.