Patent ID: 7744274

Claim:
An apparatus for processing a substrate at a desired maximum temperature, comprising: a radiation source adapted to emit a photonic beam of a beam intensity; an optical system adapted to form from the beam an image on a substrate at an incident angle of at least 45°; a stage adapted to scan the substrate across the beam image to heat the substrate surface; a temperature monitoring means for analyzing p-polarized radiation of at least three different wavelengths emitted from a substrate location containing the beam image to generate a probable maximum temperature value at the imaged location; an output error signal generator that compares the probable maximum temperature value with a preset desired maximum temperature to generate an output error signal; and a controller operably coupled to the radiation source and the stage, wherein the controller in response to the output error signal is programmed to do at least one of alter the beam intensity and modify the scanning velocity between the stage and the beam to null the output error signal.