使用F扫描非线性光谱仪对溴化铅钙钛矿薄膜在近红外波段的非线性双光子吸收

Nonlinear Two-Photon Absorption in the Near-Infrared Band for Lead Bromide Perovskite Films Using an F-Scan Nonlinear Spectrometer.

作者信息

Rueda Edgar, Serna Juan, Uribe Jose Ignacio, Ramírez Daniel, Jaramillo Franklin, Osorio Jaime, García Hernando

机构信息

Grupo de Óptica y Fotónica, Instituto de Física, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín 050010, Colombia.

Grupo de Óptica y Espectroscopía, Centro de Ciencia Básica, Universidad Pontifícia Bolivariana, Cq. 1 No 70-01, Campus Laureles, Medellín 050031, Colombia.

出版信息

ACS Omega. 2022 Aug 9;7(33):29100-29105. doi: 10.1021/acsomega.2c02967. eCollection 2022 Aug 23.

DOI:10.1021/acsomega.2c02967

PMID:36033660

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9404478/

Abstract

An F-scan nonlinear spectrometer is used to measure the two-photon absorption coefficient for CHNHPbBr perovskite films from 690 to 995 nm. This spectrometer uses an electrically focused tunable lens and a tunable femtosecond-pulse laser (Mai Tai-HP) with a resolution of 5 nm. Two-band models and saturation irradiance corrections are used to fit the experimental data. The nonlinear absorption in this wavelength range is of the order of cm/MW. We found that the best agreement between the experimental data, the reported values in the literature, and the theoretical model is obtained for an extended two-band model with irradiance saturation correction.

摘要

使用F扫描非线性光谱仪测量CHNHPbBr钙钛矿薄膜在690至995nm范围内的双光子吸收系数。该光谱仪使用电聚焦可调谐透镜和分辨率为5nm的可调谐飞秒脉冲激光器（Mai Tai-HP）。采用双波段模型和饱和辐照度校正来拟合实验数据。该波长范围内的非线性吸收量级为厘米/兆瓦。我们发现，对于具有辐照度饱和校正的扩展双波段模型，实验数据、文献报道值和理论模型之间的一致性最佳。