Patent ID: 8648277

Claim:
A method for laser direct ablation that produces patterns cut into a dielectric layer for the formation of electrically conductive traces with controlled signal propagation characteristics, the method comprising: selecting a dose fluence for removing a desired depth of material along a scribe line on a surface of a workpiece; selecting a temporal pulsewidth for each laser pulse in a series of laser pulses; selecting a pulse repetition frequency for the series of laser pulse, wherein the selection of the pulse repetition frequency is based at least in part on the selected temporal pulsewidth to maintain the selected dose fluence along the scribe line, and wherein the selected pulse repetition frequency provides a predetermined minimum overlap of laser spots along the scribe line; generating, using a laser source, a laser beam comprising the series of laser pulses according to the selected dose fluence, temporal pulsewidth, and pulse repetition frequency; and providing relative motion between the workpiece and the laser beam such that a path of the laser beam follows the scribe line location along the surface of the workpiece at a selected velocity.