of 115 u00b0 c for 24 hours the bonded sheets were diced into 2 mm u00d7 2 mm core structures of the type shown in fig4 and the sheets did not delaminate during the dicing operation the present invention is directed to isolator structures and sealing or bond processes that result in a chemical bond or vacuum bond without the use of an adhesive epoxy or an air gap between applicable surfaces the seal or bond can be achieved at temperatures at or below 100 u00b0 c thus making the process applicable for latched and unlatched garnets as is known in the art heating of garnet materials above their curie temperatures should be avoided because the properties of the material are destroyed by heating above the curie temperature a seal or bond can be achieved for a multi layered core structure where alternating layers of a polarizer and a faraday rotator are assembled for high power laser applications i e multistage isolation with 2 3 4 or more faraday rotators in series with a polarizer for each rotator this sealing or bonding process of the present invention can be utilized for assembly of glass crystalline and anti reflectance coated surfaces to each other isolators that have components e g polarizers rotators half wave plates independently mounted with air gaps require anti reflectance ar coatings to prevent back reflection at each surface due to differences in refractive index between each material and air similar differences exist for bonded interfaces due to the difference in refractive index between the two materials thus interfaces between such materials may require ar coatings typical ar coatings include a base layer material used primarily for adhesion example sio 2 for ar coating of glass surfaces followed by a material which differs.