Structure and nonlinear optical properties of Sb2O3-B2O3 binary glasses

The third order nonlinear optical susceptibilities chi((3)) of Sb2O3-B2O3 binary glasses have been measured by the third harmonic generation (THG) method. The IR and Raman spectroscopic study reconfirmed that the structure of Sb2O3 glass is similar not to senarmontite but to valentinite which consists of double-chains of SbO3 units. The formation of BO4 units is much smaller for Sb2O3-B2O3 glasses than Bi2O3-B2O3 glasses at all compositions, which is ascribed to the covalent character of Sb-O bonds. It is also considered that Sb2O3 is present as SbO3 trigonal units and participates in the glass network formation through the Sb-O-B bonds. The chi((3)) value increased monotonically with increasing Sb2O3 content up to 8.4 x 10(-13) esu for Sb2O3 glass, which is about 30 times larger than SiO2 glass. Modified Lines' linear relationship between chi((3)) and (n(omega)(2) + 2)(3) .(n(omega)(2)-1). E(d)/E(0)(2) was adopted to Sb2O3-B2O3 glasses.