Patent ID: 6574250
Filing Date: 2003-06-03
Classification: B23K,G03F,H01L

Abstract:
A method of severing electrically conductive redundant memory links positioned between respective pairs of electrically conductive contacts in a circuit fabricated on a substrate, comprising:providing to a beam positioner beam positioning data representing one or more locations of electrically conductive redundant memory links in the circuit; generating, from a laser, a first burst of a first set of at least two laser output pulses during a first time interval, each of the laser output pulses in the first set having a pulse width duration of shorter than 10 picoseconds and the first burst having a burst width duration of shorter than 500 nanoseconds; directing, in response to the beam positioning data, the first burst of the first set of laser output pulses to impinge a first electrically conductive redundant memory link at a first location between first contacts, at least two of the laser output pulses from the first set removing different portions of the first conductive link and the first burst severing the first conductive link between the first contacts; generating, from a laser, a second burst of a second set of at least two laser output pulses during a second time interval that is chronologically different from the first time interval, each laser output pulse in the second set having a pulse width duration of shorter than 10 picoseconds and the second burst having a burst width duration of shorter than 500 nanoseconds; directing, in response to the beam positioning data, the second burst of the second set of laser output pulses to impinge a second electrically conductive redundant memory link at a second location between second contacts, the second location being distinct from the first location, at least two of the laser output pulses from the second set removing different portions of the second conductive link and the second burst severing the second conductive link between the second contacts.