NONLINEAR-OPTICAL PROPERTIES OF B2O3 BASED GLASSES - BINARY AG2O-B2O3AND TERNARY AGX-AG2O-B2O3 (X=CL, BR AND I) GLASSES

The third order nonlinear optical susceptibilities chi((3)) of AgX-Ag2 O-B2O3(X=Cl, Br and I) glasses have been measured by the third harmoni c generation(THG) method with special attention to highly polarisable cations and halide anions contained in these glasses. It was found tha t the chi((3)) of Ag2O-B2O3 and AgX-Ag2O-B2O3 (X=Cl, Br and I) increas es with increasing content of Ag2O and AgX, respectively. The largest chi((3)) value obtained is 6.0x10(-12) esu for the 50AgI-25Ag(2)O-25B( 2)O(3) ternary glass, which is about 200 times greater than that of si lica glass. Such a large chi((3)) may be ascribed mainly to the optica l resonance effect and the strong p-d mixing of silver halide as well as high polarisability of silver and halide ions. The modified Lines' linear relationship between chi((3)) and (n(omega)(2) +2)(3).(n(omega) (2) -1). E(d)/E(0)(2) was found to be adopted well for these glasses.