Corning Incorporated
LASER WELDED SHEETS, LASER WELDING METHODOLOGY, AND HERMETICALLY SEALED DEVICES INCORPORATING THE SAME

Abstract:

A laser-welded assembly of opposing sheets of ceramic and glass, ceramic, or glass-ceramic compositions comprises an intervening bonding layer having a thickness dimension that separates the opposing sheets by less than about 1000 nm. Each of the opposing sheets has a thickness dimension at least about 20 times the thickness dimension of the intervening bonding layer. The intervening bonding layer has a melting point greater than that of one or both of the opposing sheets. The ceramic sheet is a pass-through sheet with a composite T/R spectrum comprising a portion that lies below about 30% across a target irradiation band residing at or above about 1400 nm and at or below about 4500 nm wavelength. The intervening bonding layer has an absorption spectrum comprising a portion that lies above about 80% across the target irradiation band. The assembly comprises a weld bonding the opposing surfaces of the opposing sheets.