STRUCTURE-PROPERTY RELATIONSHIP OF POTASSIUM TITANYL (KTP) ISOMORPHOUS SUBSTITUTED CRYSTAL

KTiOPO4(KTP) crystal is a nonlinear optical material with superior pro perties. The KTP structure, point group mm2, is typified by the chemic al form \K+\[Ti4+]O(P5+)O-4, where the curly brackets indicate nine or eightfold coordination, the square brackets sixfold octahedral coordi nation and the parentheses fourfold tetrahedral coordination. Differen t isovalent and aliovalent substitutions in a given structure is quite interesting. The KTP-type structure is extremely accommodating with r espect to partial or complete isomorphous substitution which may be es pecially significant in optical devices such as waveguides. A monograp hic review of the structure-property relationship of KTP isomorphous s ubstitution is briefly and precisely presented. II is shown that the p roperties of KTP are very sensitive to its structure. Among the compos ition, structure and properties of KTP-type crystal, the structure is the core because it is a link between the composition and properties.