The origin of nonlinearity in KTiOPO4 was investigated quantitatively from the chemical bond viewpoint, Ali constituent chemical bonds in this crystal were considered and their contributions to the total linearity and nonlinearity were quantitatively determined. Calculated results agree satisfactorily with experimental data in both signs and numerical values. These results show us that TiO↓(6) groups and P(1)O↓(4) groups have relatively larger linear contributions and the nonlinearity derives from KO↓(x) (x= 8,9) groups and P(2)O↓(4) groups. # 1997 American Institute of Physics. S0003-6951 (97)01508-8
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