Patent ID: 8546805

Claim:
A method of annealing a semiconductor substrate having a patterned surface and a melt temperature, comprising: measuring, for a portion of the patterned wafer surface, first and second reflectivity maps at respective first and second wavelengths; using the first and second reflectivity maps, defining first and second intensities of first and second laser beams having the first and second wavelengths, respectively, that reduces an amount of surface temperature variation when the first and second laser beams irradiate the portion of the patterned surface during annealing of the semiconductor substrate as compared to annealing the portion of the patterned wafer surface using only one of the first and second laser beams; and irradiating the portion of the patterned surface to anneal the semiconductor substrate without melting the semiconductor substrate using the first and second laser beams having the first and second intensities, respectively.