CALCULO DE LA CORRIENTE DE ARRASTRE Y FOTOVOLTAICA PARA NIOBATO DE LITIO BAJO CONDICIONES DE RESONANCIA

Abstract

Under resonant condition we calculate the drift and photovoltaic current for a lithium niobate crystal employing the reflection geometry. For this propose, we first solved numerically the material rate equations which illustrate the photorefractive effect. We found the space-charge field, the charge carrier density and the ionized donors density. By means of the space-charge field, we calculated the refractive-index changes. When the applied field is around of 100 kV/cm the refractive-index changes have a minimum so-called resonant. Our numerical results are in a good agreement with experimental data previously reported in reference [32]. Finally, with the above solutions we calculate the drift and photovoltaic current densities for differents modulations and applied fields.