Dielectric relaxation induced by a space charge in poled glasses for nonlinear optics
Idioma
en
Article de revue
Este ítem está publicado en
Journal of Applied Physics. 2006, vol. 100, n° 3, p. 034905/1-7
American Institute of Physics
Resumen en inglés
Unpoled and efficient nonlinear optical (NLO) poled sodium niobium borophosphate glasses have been studied by means of dielectric spectroscopy. The thermal poling process induces a dielectric relaxation that gradually ...Leer más >
Unpoled and efficient nonlinear optical (NLO) poled sodium niobium borophosphate glasses have been studied by means of dielectric spectroscopy. The thermal poling process induces a dielectric relaxation that gradually vanishes on heating for T>~500 K. The data are interpreted by a two-layer (Maxwell-Wagner) model, consisting of a bulk and a Na+ poor surface layer with lower conductivity. Our results suggest that the ion transport is due to hopping mechanism implying at least Na+. All the dielectric results are in full agreement with previous optical analyses. This is an example of poled glasses where an efficient NLO response is directly correlated to the conductivity of the material enhanced by a high alkali loading.< Leer menos
Palabras clave en inglés
Niobates
Glasses
Polarization and depolarization
Dielectric breakdown and space-charge effects
Heat and thermomechanical treatments
PZT ceramics
Dielectric loss and relaxation
tantalates
titanates
quartz
Orígen
Importado de HalCentros de investigación