NONLINEAR-OPTICAL PROPERTIES OF TEO2-BASED GLASSES - MO(X)-TEO2 (M=SC, TI, V, NB, MO, TA, AND W) BINARY CLASSES

The third-order nonlinear optical susceptibilities, chi((3)), of TeO2-based glasses containing transition metal oxides (M = Sc2O3, TiO2, V2O5, Nb2O5, MoO3, Ta2O5, and WO3) glasses have been measured by the third harmonic generation (THG) method in order to investigate the effect of the empty d-orbital contributions to the third-order nonlinear optical susceptibilities. It is found that the addition of TiO2, Nb2O5, and WO3 to TeO2 glass increases the chi((3)) value as well as the refractive index, while others decrease both of them, The positive effect of the TiO2, Nb2O5, or WO3, on the chi((3)) of TeO2 glass was interpreted in terms of the cationic empty d-orbital contribution, There is an almost linear relation between the chi((3)) and the term (n(w)(2) + 2)(3) .(n(w)(2) - 1). E(d)/E(0)(2) containing three measurable parameters only, irrespective of the kinds of MO, which was derived based on the bond orbital theory developed by M. E. Lines. The largest chi((3)) value obtained is 1.69 x 10(-12) esu for 30NbO(2.5). 70TeO(2) glass, about 60 times larger than that of pure fused silica glass.