Theoretical study for thermal/electric field poling of fused silica

Using the multiple-carrier model, the process of thermal/electric-field pol ing in fused silica is analyzed in this study for the first time. The depic tion region may be composed of a positively charged layer, an ionosphere la yer and a negative depletion layer, and the charge density distribution in the depletion region is derived and obtained. The calculation results show that the distribution of the charge density in the entire depletion region has a quasi-step profile, and both the positively charged region and the ne gative depletion layer have an approximately uniform distribution. Expressi ons for the depletion width and the electric field distribution in the depl etion region are obtained. Theoretical results show that the peak electric field is located in the interior of the depletion region, and the internal electric field is about 10(9) V/m, up to two orders of magnitude higher tha n the applied initial poling field.