The thermal relaxation of second order optical nonlinearity in subsurface layer of a poled soda-lime silicate glass was studied. It is shown that the glass annealing below glass transition temperature leads to full relaxation of the nonlinearity. At the same time. the measurements of thermostimulated depolarization current demonstrate that spatial electric charge formed in the course ... https://www.parisnaturalfoodes.shop/product-category/sweetfern-tonic/