Temperature dependence of second-order nonlinear relaxation of a poled chromophore-doped sol-gel material

Second-order optical nonlinearity relaxations of hybrid inorganic/organic s ol-gel films doped with poled Disperse Red 1 chromophores were measured by second harmonic generation at several temperatures. The decay curves were f itted to biexponentials and Kohlrausch, Williams, and Watts (KWW) stretched exponentials. It can be concluded that the KWW model well describes chromo phore thermal reorientation in hybrid sol-gel materials, as is known for al l-organic polymers. Using the Arrhenius law, the activation energy of the r eorientation process has been determined to be about 50 or 70 kcal mol(-1). A stability of roughly a decade has been extrapolated at room temperature. Another experiment at room temperature gave an estimation of the stability that was found to be in qualitative agreement. It is shown that poled chro mophore-doped sol-gel materials have the potential to be stable enough for applications in telecommunication devices. (C) 2001 American Institute of P hysics.