Crystallization and second harmonic generation in thermally poled niobium borophosphate glasses |
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Authors: | Artem Malakho Marc Dussauze Bogdan Lazoryak Frederic Adamietz |
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Affiliation: | a Institut de Chimie de la Matière Condensée de Bordeaux—UPR 9048 CNRS, Chateau Brivazac, Avenue du Dr. Schweitzer, 33608 Pessac Cedex, France b Department of Material Science, Moscow State University, Moscow 119899, Russia c Department of Chemistry, Moscow State University, Moscow 119899, Russia d Laboratoire de Physico-Chimie Moléculaire, UMR 5803 CNRS, Université Bordeaux I, 351 cours de la Libération, 33405 Talence Cedex, France |
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Abstract: | Crystallization of glasses with compositions (1−x)(0.95 NaPO3+0.05 Na2B4O7)+xNb2O5, x=0.4, 0.43, 0.45, 0.48 was investigated by differential scanning calorimetry and X-ray powder diffraction. Crystallization of two phases was observed in the glasses with x=0.43-0.48. First phase is a sodium niobate with the structure of tetragonal tungsten bronze () and second phase is Na4Nb8P4O32 (). The crystallization of sodium niobate is correlated with increasing of nonlinear optical efficiency reported for thermally poled glasses with x>0.4. The results of Raman spectroscopy show the formation of three-dimensional (3D) niobium oxide framework in the glasses with increase of niobium concentration. This framework is supposed to have tetragonal tungsten bronze structure and to be responsible for nonlinear optical properties of the glass. Second harmonic generation signals of as prepared and crystallized glass after thermal poling are compared. The nucleation and crystallization do not improve the NLO properties of the glasses under study. |
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Keywords: | Optical nonlinearity Thermal poling Niobium glasses Borophosphate glasses Glass-ceramic composites Second harmonic generation |
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