In optical-damage resistant LiNbO3:Zn crystals a correlation is found between dependencies of optical properties and the unit cell parameters on Zn concentration. Nonmonotonic shapes of these curves may be accounted for by different Zn incorporation into the lattice depending on the Zn amount. Peculiarities observed at about 2-3 mol% Zn may be related to a removal of NbLi defects which is due to Zn incorporation on Li-sites. At concentrations exceeding 6.5 mol% Zn a partial incorporation of Zn ions on Nb-sites is detected. The wellknown extrema and anomalies in concentration dependencies of various optical properties, including a drastic fall of photorefraction observed formerly in the range from 6 to 7 %Zn may be accounted for in terms of these structural data. Concentration dependencies of the electrooptical coefficients presented here find a qualitative interpretation within the same scheme.

© 1999 Optical Society of America

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