Methods and systems for optical devices with fusion bonded glass substrates

An optical device comprising:

• a first transparent oxide layer having a first surface:
• a first set of surface coatings, wherein
• each surface coating in the first set of surface coatings is bonded to another surface coating in the first set of surface coatings, and
• a first surface coating in the first set of surface coatings is bonded to the first surface, thereby attaching the first set of surface coatings to the first transparent oxide layer,
• at least one surface coating in the first set of coatings is a partial reflective coating:
• a second transparent oxide layer having a second surface and an opposing third surface:
• a second set of surface coatings, wherein
• each surface coating in the second set of surface coatings is bonded to another surface coating in the second set of coatings, and
• a first surface coating in the second set of surface coatings is bonded to the third surface,
• at least one surface coating in the second set of surface coatings is a partial reflective coating:
• wherein
• an outer surface coating in the first set of surface coatings is covalently bonded to the second surface of the second transparent oxide layer through a plurality of covalent interactions of the form X—O—Y, thereby attaching the first transparent oxide layer and the second transparent oxide layer to each other,
• each X is an atom of the outer surface coating of the first set of surface coatings,
• O is an oxygen atom,
• each Y is an atom of the second transparent oxide layer:
• and wherein
• the first and second transparent oxide layers attached to each other collectively have a bow of less than 100 micrometers or have a total thickness variation (TTV) of less than 5 microns.