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Study of nonlinear optical properties of undoped and Mg doped ZnO thin films

We report the nonlinear optical properties in pulsed laser deposited undoped and Mg-doped ZnO films. Structural and optical properties of the films were analysed by X-ray diffraction and ultraviolet-visible spectroscopy, respectively. Films obtained are single crystalline with wurtzite structure. An increase in bandgap was observed for Mg doped film. Z-scan technique was adopted to obtain the nonlinear optical properties of the films. The nonlinear absorption is attributed to the two-photon absorption process in the films whereas the nonlinear refraction arises due to thermal lensing effect.