Abstract

Bismuth oxyhalides, such as bismuth oxychlorides (BiOCl), are layered materials with ${[{\mathrm{Bi}}_2{\mathrm{O}}_2]}^{2+}$ 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.

© 2015 Optical Society of America

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