Method of separating strengthened glass

A method of separating a strengthened glass sheet, the method comprising:

• a. providing the strengthened glass sheet, the strengthened glass sheet having a first surface and a second surface, wherein each of the first surface and the second surface have a strengthened surface layer under a compressive stress and extending from the surface to a depth of layer, and a central region under a tensile stress;
• b. forming a first laser-induced damage line in the central region at a predetermined depth below the first surface by irradiating the glass sheet with a laser having a power in a range from about 1 W to 3 W;
• c. forming a second laser-induced damage line, the second laser-induced damage line being located between the strengthened surface layer of the first surface and the first laser-induced damage line, the second laser-induced damage line being parallel to the first laser-induced damage line, the first laser-induced damage line and the second laser-induced damage line defining a plane being perpendicular to the first surface and the second surface;
• and
• d. initiating and propagating a crack to separate the strengthened glass sheet into at least two pieces, wherein at least one of the pieces has at least one of a predetermined shape and a predetermined dimension.