Patent ID: 8397537

Claim:
A method of forming, on the surface of a glass material, a raised feature having a height within a target range, the method comprising: (1) providing a glass material having a surface; (2) providing the glass material locally, at a location at or below the surface, with an amount of energy causing local expansion of the glass material so as to raise a feature on the surface at the location; (3) detecting the height of the raised feature or the height over time of the raised feature; and (4)( a ) if the height is below or approaching a value below the target range, providing the glass material at the location with energy in a greater amount, ( b ) if the height is above or approaching a value above the target range, providing the glass material at the location with energy in a lesser amount, (5) repeating steps (3) and (4) as needed to bring the height within the target range.