Patent ID: 8569187

Claim:
A method of processing a substrate, comprising: directing a radiant energy field toward a portion of the substrate, wherein the radiant energy field comprises pulsed light from a plurality of lasers that have been combined by passing the pulsed light through two sides of a selecting surface of a combining optic, wherein the pulsed light is temporally decorrelated by splitting the pulsed light into a plurality of sub-pulses and routing each of the plurality of sub-pulses along a different path with a different optical length, and spatially decorrelated by creating an energy field from the pulsed light and overlapping portions of the energy field; detecting a temporal shape of the radiant energy field using a photodiode; detecting an energy content of the radiant energy field using a pyroelectric detector; adjusting a pulse timing of one or more of the lasers based on the temporal shape of the radiant energy field detected by the photodiode; and attenuating one or more of the lasers based on the energy content of the radiant energy field detected by the pyroelectric detector.