A method and apparatus (42) for laser scribing coatings on glass sheet
substrates
by conveying the substrate adjacent a laser source (83) that provides a
pulsed laser beam (84) with a wavelength at a near-infrared fundamental
frequency and having a frequency in the range of 50 to 100 kilohertz and a pulse
duration in the range of 8 to 70 nanoseconds, and by reflecting the beam by an
XYZ galvanometer controlled mirror system (90) toward an uncoated surface
of the substrate for passage therethrough to the coating on the other surface to
provide overlapping ablations through the coating and scribing at a speed of at
least 1000 millimeters per second.
