Patent ID: 8367968
Filing Date: 2013-02-05
Classification: B23K,H01L

Abstract:
1. A method of laser-based processing a workpiece along a continuous motion trajectory, said method comprising the steps of: generating at least two laser pulses closely spaced in time in response to a variable timing signal; selecting at least two pulses of the closely spaced pulses during the continuous motion trajectory corresponding to a workpiece target with an optical modulator that is controlled according to a command sequence of pulse impingement intervals and non-impingement intervals to allow each selected pulse to impinge the workpiece target during a pulse impingement interval; changing the variable laser pulse timing signal to vary the spacing of the closely spaced pulses, wherein at least one pulse time is shifted from an impingement interval to an adjacent non-impingement interval, and blocking the at least one shifted pulse from impinging the workpiece during non-impingement interval with the optical modulator; wherein the variable laser pulse timing signal is sufficiently continuous to maintain stable laser operation.