Abstract
Low temperature Ag+/Li+ ion-exchange was performed on Ag+-containing aluminosilicate glass to give refractive index pattern. 216°C was found to be high enough for Ag+/Li+ ion-exchange to proceed, and did not have any influence on the concentration profile in the region protected by Ti-coating. Using 2-step ion-exchange treatment, a patterning with 3 refractive-indices was demonstrated.