Spatial control of second-order optical susceptibility induced in thermally poled glasses

Summary form only given. Second order susceptibility /spl chi//sup (2)/ has previously been induced in different thermally poled glasses. It is mainly due to coupling of the third order glass susceptibility /spl chi//sup (3)/ with a built in electric field E/sub int/ (/spl chi//sup (2)//spl sim//spl chi//sup (3)/E/sub int/). We have recently shown that electron-hole pairs are produced by a one or two-photon absorption screen E/sub int/, and explain the decay of the /spl chi//sup (2)/ in thermally induced borophosphate glasses. Here we demonstrate for the first time that this general phenomena allows one to tailor the spatial profile of second order susceptibility induced in both thermally poled fused silica and borophosphate glasses.