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Nonlinear properties and structural rearrangements in thermally poled niobium germanate glasses
MARCONDES, Lia Mara
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
ORIVES, Juliane Resges
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
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Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
MARCONDES, Lia Mara
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
ORIVES, Juliane Resges
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
NALIN, Marcelo
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
< Reduce
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
Language
en
Article de revue
This item was published in
Journal of Non-Crystalline Solids. 2024, vol. 627, p. 122809
Elsevier
English Abstract
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 ...Read more >
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.Read less <
English Keywords
Glass
Thermal poling
Nonlinear optics
European Project
Centre for functional and surface-functionalized glasses
Origin
Hal imported