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3 pags. ; 2 figs.Erbium-doped LiNbO₃ films have been produced in a single-step process by alternate pulsed laser deposition. The dopant is incorporated in submonolayers whose nominal indepth separation is varied in the range 1.7–4.0 nm to lead respectively to Er concentrations in the range 3.4–0.6×10²º atoms/cm⁻³. All the films exhibit the characteristic Er³⁺ photoluminescence at 1.54 μm with lifetime values as high as 3 ms. The d₃₃ nonlinear coefficients determined from second-harmonic generation experiments are in the range 22–28 pm/V, the films having nominal Er submonolayer indepth separation of 3–4 nm exhibiting d₃₃ values slightly above that of the bulk material. The comparison of the d₃₃ values obtained in the Er-doped films to those reported earlier for similar undoped films shows clearly that both the structural quality and the second-harmonic performance of the films can be enhanced by Er doping.This work was partially supported by CICYT (Spain)under Project No. TIC99-0866 and the Acción Integrada Hispano-Británica programme (HB1999-0149)Peer reviewe

Enhanced second-order nonlinear optical response of LiNbO3 films upon Er doping