Abstract
The third‐order nonlinear optical susceptibilities χ(3) of M2O‐B2O3 (M = Li, Na, K, Rb, Cs, and Ag) binary borate glasses have been measured by the third harmonic generation (THG) method. It is found that the enhancement of χ(3)by the structural change of BO3 units to BO4 units is small, while the enhancement of χ(3) due to the formation of non‐ bridging oxygen is rather significant. The effects of alkali cations on the χ(3) of alkali borate glasses are discussed in terms of the M‐O bond character, focusing on the covalency of Li2O‐B2O3 glasses. Comparison of the χ(3) values for Cs2O‐B2O3 and Ag2O‐B2O3 glasses which contain cations of comparable polarizability reveals that the χ(3) value is much greater for Ag2O‐B2O3 glasses than for Cs2O‐B2O3glasses, which is possibly due to the great contribution of Ag(4dz2+ 5s+ 5pz) hybrid orbitals to the nonlinear optical response.
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