Nonlinear Two-Photon Absorption in the Near-Infrared Band for Lead Bromide Perovskite Films Using an F-Scan Nonlinear Spectrometer.
Edgar RuedaJuan SernaJose Ignacio UribeDaniel RamirezFranklin JaramilloJaime OsorioHernando GarcíaPublished in: ACS omega (2022)
An F-scan nonlinear spectrometer is used to measure the two-photon absorption coefficient for CH 3 NH 3 PbBr 3 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.
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