Effect of sodium to barium substitution on the space charge implementation in thermally poled glasses for nonlinear optical applications

Artem Malakho (1, 2) , Marc Dussauze (3, 4) , Evelyne Fargin (1) , Olivier Bidault (5) , Vincent Rodriguez (4) , Frédéric Adamietz (4) , Bertrand Poumellec (6)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Department of Material Science
3 Theoretical and Physical Chemistry Institute
4 ISM - Institut des Sciences Moléculaires
5 LPUB - Laboratoire de Physique de l'Université de Bourgogne
6 CHIMSOL - Laboratoire de Physico-Chimie de l'Etat Solide

Thermally poled niobium borophosphate glasses in the system 0.55(0.95−y) NaPO₃+y/2 Ba(PO₃)₂+0.05Na₂B₄O₇)+0.45Nb₂O₅ were investigated for second order optical nonlinear (SON) properties. Bulk glasses were studied by Raman spectroscopy, thermal analysis, optical and dielectric measurements. The sodium to barium substitution does not lead to significant changes in optical properties, crystallization of glasses and coordination environment of polarizable niobium atoms. However, the ionic conductivity decreases drastically with the increase of barium concentration. Secondary ion mass spectroscopy has been used to determine the element distribution in the anode layer of the thermally poled glasses. The second order optical susceptibilities gradually decrease from χ⁽²⁾=2.8 pm/V to zero with the increase of barium content. Using a simple electrical model, variations of nonlinear optical responses have been correlated with dielectric characteristics.

Mots clés: Thermal poling; Space charge; Second harmonic generation; Borophosphate glasses; Ionic conductivity

Domaines: Matériaux

Artem Malakho, Marc Dussauze, Evelyne Fargin, Olivier Bidault, Vincent Rodriguez, et al.. Effect of sodium to barium substitution on the space charge implementation in thermally poled glasses for nonlinear optical applications. Journal of Solid State Chemistry, 2009, 182 (5), pp.1156-1163. ⟨10.1016/j.jssc.2009.02.016⟩. ⟨hal-00381987⟩