REFRACTIVE-INDEXES OF ZN-DOPED LITHIUM-NIOBATE

We measured the index of refraction n(lambda) of Zn-doped LiNbO3 grown from a congruent melt as a function of the Zn concentration in the cr ystal. The Zn concentration c(Zn) in a sample was determined by electr on microprobe technique. The refractive index n(lambda, c(Zn)) is desc ribed by a generalized Sellmeier equation for 400 < lambda < 1200 nm a nd c(Zn) up to 8 mol% ZnO. Calculated phase-matching conditions of non linear effects like second-harmonic generation are in excellent agreem ent with experimental results obtained with the same set of crystals.