We have found for the first time that Cu3Se2 nanowired products encased inside the alumina pores by electrodeposition demonstrate the promising nonlinear optical properties in UV-vis-NIR spectra region. Furthermore, the annealing of these products results in the formation of Cu2-xSe with x depending on the annealing temperature. Optical nonlinearities of as-grown and thermally treated copper selenide nanowire arrays were evidenced using the standard open-aperture Z-scan and laser pump-probe techniques. (C) 2009 Elsevier B. V. All rights reserved.