title: Z-scan measurement of nonlinear optical properties of BiOCl nanosheets.
abstract: Bismuth oxyhalides, such as bismuth oxychlorides (BiOCl), are layered materials with [Bi2O2]2+layers sandwiched between two sheets of Cl ions. Much work has focused on the potential for bismuth oxyhalides to be a photocatalyst, but their nonlinear optical properties are rarely studied. In this work, the nonlinear refractive index of BiOCl nanosheets has been characterized with Z-scan measurement under 800 nm femtosecond pulsed laser excitation. A shift from saturable absorption to reverse saturable absorption was observed at higher input pump intensities in the experiments. The transition process was analyzed using a phenomenological model based on saturable absorption and two-photon absorption.
authors.forename: Runze
authors.initials: R
authors.lastname: Chen
authors.forename: Xin
authors.initials: X
authors.lastname: Zheng
authors.forename: Yangwei
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Tang
authors.forename: Tian
authors.initials: T
authors.lastname: Jiang