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Abstract: The nonlinear absorption (NLA) properties of copper phthalocyanine (CuPc) solution in acetone were investigated by the femtosecond open-aperture (OA) Z-scan technique. The reverse saturable absorption (RSA) phenomenon was observed. And the physical mechanism of RSA effect was revealed, which was originated from three-photon absorption. Moreover, the influences of concentration and excitation laser power on the NLA of CuPc solution were studied respectively. Results showed that the RSA effect increased with the increase of sample concentration and excitation laser power. It indicated that the CuPc could be a promising candidate for optical limiting material. [Copyright &y& Elsevier]

Abstract: Phthalocyanines are promising molecules which present very attractive properties for nonlinear optical applications. The optical limiting performances of copper phthalocyanine and polychloro copper phthalocyanine have been investigated using 1064-nm continuous wave laser. The output–input power characteristics and nonlinear transmission properties for different solutions of copper phthalocyanine and polychloro copper phthalocyanine in acetone at increasing concentration were obtained. The observed nonlinearities were interpreted theoretically by rate-equation within a three-level model. The good optical limiting performance is attributed to a reverse saturable absorption (RSA) mechanism. It indicates that both copper phthalocyanine and polychloro copper phthalocyanine could be promising candidates for optical limiting materials. [Copyright &y& Elsevier]