Patent ID: 7528342
Filing Date: 2009-05-05
Classification: B23K,H05K

Abstract:
1. A laser machining apparatus for via drilling and selective material removal in a semiconductor wafer or workpiece having an ultrafast laser pulse emitted directly from an ultrafast laser oscillator, comprising: an emitter configured to emit a pulsed laser beam from a diode pumped or CW laser pumped solid state ultrafast laser oscillator without amplification in addition to the amplification provided by the ultrafast laser oscillator; an external controller configured to control the laser pulse, to minimize the cumulative heating effect and to improve the machining quality; a varying unit configured to control the diameter of the laser beam along at least one axis; a scanner configured to scan the laser beam in two axes; and a focusing unit configured to focus the pulsed laser beam on to the work piece or semiconductor wafer; wherein a via is drilled or material is selectively removed from the work piece or semiconductor wafer; wherein the ultrafast laser oscillator includes a fiber oscillator amplifier of a repetition rate greater than 1 MHZ.