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Article Dans Une Revue Journal of Non-Crystalline Solids Année : 2024

Nonlinear properties and structural rearrangements in thermally poled niobium germanate glasses

Résumé

Second order nonlinear optical properties and structural rearrangements in GeO 2-Na 2 O-Nb 2 O 5 glasses were achieved by thermal poling. The effects of applied voltage as well as sodium and niobium contents on nonlinear optical (NLO)-active layer were investigated. Structural rearrangements in the anodic microlayer were investigated and occur due to sodium depletion promoting variation in bridging/non-bridging oxygen ratio and formation of a more polymerized network. Quantitative analysis of second harmonic generation signals confirm the electrooptical origin of the nonlinear optical response described by the electric-field-induced second harmonic model. χ (2) susceptibility values range from 0.42 to 0.76 pm/V depending on the niobium content. Lastly, the charge compensation mechanism with increasing applied voltage was described in detail. A progressive decrease in χ (2) for higher voltages was observed due to a greater poled thickness than expected by classical electrostatic models. In this case, the compensation mechanism occurs due to structural rearrangement, redox reactions, and motion of negative charges.

Domaines

Matériaux
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Dates et versions

hal-04410194 , version 1 (22-01-2024)

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Lia Mara Marcondes, Juliane Resges Orives, Frédéric Adamietz, Gael Yves Poirier, Thierry Cardinal, et al.. Nonlinear properties and structural rearrangements in thermally poled niobium germanate glasses. Journal of Non-Crystalline Solids, 2024, 627, pp.122809. ⟨10.1016/j.jnoncrysol.2023.122809⟩. ⟨hal-04410194⟩
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