Thermally poled germanosilicate films with high secondorder nonlinearity
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Optical Society of America
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Accurate measurements of the second-order nonlinearity profile of thermally poled low-loss germanosilicate films grown on fused-silica substrates are reported, of interest as potential electro-optic devices. After optimization, we demonstrate a record high nonlinear coefficient d33 ≈1.6 pm/V, a two-fold improvement over highest reported d33 value in fused silica that we attribute to the presence of germanium. © 2005 Optical Society of America.