CZOCHRALSKI-GROWN LITHIUM-NIOBATE WITH REGULAR DOMAIN-STRUCTURE

Periodically-poled LiNbO3 bulk crystals with (Y, Mg), (Dy, Mg), (Nd, M g) end (Eu, Mg) were grown along the normal to the faces {0112}. The s uperlattice with period 4-30 mu m was studied by chemical etching, opt ical microscopy and by wave dispersive X-ray microanalysis In the scan ning electron microscope (SEM). The face (0112) forms thin and flat bo undaries of domain and is favourable to a high stability of domain per iod. The distribution of Impurities in double-doped LiNbO3 crystals ha s the form close to sinusoid with the period corresponding to the peri od of regular domain structure.