%'e measured the re&active indices of undoped and Mg-doped lithium niobate by an interferometric technique in a wavelength range from 400 to 1200 nm. The composition of the undoped samples varied between 47 and 50 mo1% Li&O in the crystal whereas the Mg-doped samples were grown from congruent melt with up to 9 mol%%uo Mg. Our results can be excellently described by a generalized Sellmeier equation which takes into account the defect structure of Li-de6cient and Mgdoped lithium niobate. Calculations of the phase-matching conditions of several nonlinear efFects in Mg-doped lithium niobate reveal good correspondence with the respective experimental results in a temperature range from -50 to 250 'C.
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