Second-Harmonic Generation in Optically Poled WO3-TeO2 Glasses Doped with Vanadium and Rare-Earth Elements (特集光機能材料)

概要

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Second-harmonic generation (SHG) has been observed in optically poled TeO2-WO3 glasses doped with vanadium. The second-harmonic (SH) intensity depends on the concentration of vanadium; the glass doped with 0.1 mol% of V2O5 manifests the maximum SH intensity. The SH intensity is larger and the second-order nonlinearity is more stabile for 20WO3 · 80TeO2 glasses than for 15Nb2O5 · 85TeO2 glasses reported previously. Besides, enhancement of SH intensity is observed in glasses co-doped with rare-earth element such as Tb, Pr, and Ce in addition to vanadium. We speculate that Tb4+, Pr4+and Ce4+ play a role of trap centers for electrons; a positive hole trapped at V4+ as well as the electron trapped at the tetravalent rare-earth ion forms internal dc field, the spatial periodic variation of which gives rise to SHG.
社団法人粉体粉末冶金協会の論文
2005-10-15