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Enhanced nonlinear optical properties of oxygen deficient lead-niobium-germanate film glasses

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7 Author(s)
Gonzalo, J. ; Laser Processing Group, Instituto de Optica, CSIC, Serrano 121, 28006 Madrid, Spain ; Fernandez, H. ; Solis, J. ; Munoz-Martin, D.
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The third order nonlinear optical properties of oxygen deficient lead-niobium-germanate film glasses with heavy metal contents beyond that of the bulk glass formation region have been investigated. Values of the nonlinear third order optical susceptibility up to (3)/≈1.8×10-11 esu have been measured by degenerate four wave mixing at 800 nm in films having large heavy metal fractions (0.93). The fast buildup and decay times (≈130 fs) of the nonlinear response confirm its nonresonant character. The partial reduction of Nb5+ to Nb4+ evidenced by x-ray photoelectron spectroscopy, which is associated with the oxygen deficiency, appears to be responsible for the strong enhancement of (3)/.

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Applied Physics Letters  (Volume:90 ,  Issue: 25 )