OPTICAL QUADRATIC NONLINEARITY IN MULTILAYER CORONA-POLED GLASS-FILMS

Second order nonlinearity via corona poling at room temperature in a C oming 7059 glass film on a Pyrex glass substrate was studied. It was c learly pointed out that the origin of the induced nonlinearity in this waveguide was located at the interface region between a top layer gla ss film and a glass substrate. This region is formed to be a depletion layer in the consequence of a drift of positive ions towards a negati ve electrode during corona poling. X-ray photoelectron spectroscopy me asurement on the corona-poled Pyrex glass substrate gave the evidence that the main mobile ions were sodium ions. (C) 1996 American Institut e of Physics.