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Title: Enhanced nonlinear optical properties of oxygen deficient lead-niobium-germanate film glasses
Authors: Gonzalo de los Reyes, José, Fernández Martínez, Héctor, Solís Céspedes, Javier, Muñoz-Martín, David, Fernández Navarro, José María, Afonso, Carmen N., Fierro, Jose L. G.
Keywords: [PACS] Glasses, quartz
[PACS] Optical coatings
[PACS] Optical susceptibility, hyperpolarizability
[PACS] Beam trapping, self-focusing and defocusing; self-phase modulation
[PACS] Disordered structures
Issue Date: 19-Jun-2007
Publisher: American Institute of Physics
Abstract: 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 /χ(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 /χ(³)/.
Description: 3 pags. ; 3 figs. ; 1 tab.
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ISSN: 0003-6951
???metadata.dc.identifier.doi???: 10.1063/1.2749837
Citation: Applied Physics Letters, 90 (25) : 251907 (2007)
Appears in Collections:(CFMAC-IO) Artículos

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