One of the first techniques I learned about laser engraving glass was to use wet newspaper. Take some scrap newspaper and soak it in water. Lay down the wet piece of newspaper where the laser will engrave. When you laser, you are not only burning through the wet newspaper, but you are also marking the glass. The wet newspaper acts as a coolant, helping dissipate the heat, which results in minimal glass fracturing. On larger areas, you may have to establish a method of keeping the newspaper wet while laser engraving as the exhaust fan can quickly dry it out.
—Richard Korbyl, Columbia Awards