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The largest non-linear optical coefficient in LiNbO_3 is d_(33)(about 7.5 times largerthan d_(31)which is the coefficient ordinarily used)which can not be phase-matched.Dur-ing Czochralski growth,doping with about 1% of yttrium,and intentionally makingthe rotation axis noncoincident with the symmetry axis of the temperature field,so cry-stals with pronounced striae are grown,then cooling through Curie point,LiNbO_3 crystalswith periodic ferro-electric domains in alternate signs are obtained.Growth axis isalong a-axis which is perpendicular to the polar axis of crystals.In genera l_P,the widthof the positive domains and l_n,those of negative domains,are unequal,however by adjus-ting rotation periods and pulling rates,so that l_p+l_n～2l_c may be achieved(l_c is the
The largest non-linear optical coefficient in LiNbO_3 is d_ (33) (about 7.5 times largerthan d_ (31) which is the coefficient ordinarily used) which can not be phase-matched. Dur ing ing Czochralski growth, doping with about 1% of yttrium, and intentionally making the rotation axis noncoincident with the symmetry axis of the temperature field, so cry-stals with pronounced striae are grown, then cooling through Curie point, LiNbO_3 crystals with periodic ferro-electric domains in alternate signs are obtained. Growth axis isalong a -axis which is perpendicular to the polar axis of crystals. In genera l_P, the width of the positive domains and l_n, those of negative domains, are unequal, but by adjus-ting rotation periods and pulling rates, so that l_p + l_n ~ 2l_c may be achieved (l_c is the