A promising optical limiting material: Tunable third-order nonlinear optical properties of robust CsPbX3 (X=Cl/Br, Br) nanocrystals glasses

Abstract

As laser technology advances, the importance of laser protection puts an urgent demand for robust and high-efficient optical limiting materials. In this work, CsPbX3 (X = Cl/Br, Br) NCs were synthesized by precisely controlling the ratio of Cl− to Br− and the heat treatment temperature, and the third-order nonlinear (TONL) optical properties of them were investigated systematically and deeply based on a nonlinear optical imaging technique with the phase-object (NIT-PO) at 532 nm for the first time. All of them demonstrate strong reverse saturation absorption (∼10-12–10-11 m/W), and the sign of TONL refraction index (γ) relates to the component (CsPb(Cl/Br)3 NCs glasses: ∼10-20 m2/W, CsPbBr3 NCs glasses: ∼−10-20 to 10-19 m2/W). In addition, they have excellent characteristics of thermal stability and water stability, as well as photostability under 455 nm laser irradiation, indicating that it is a promising optical limiting material.