Patent ID: 8129203

Claim:
A method of manufacturing integrated circuits, the method comprising: providing a wafer; establishing a correlation between a plurality of reflectivity values of a plurality of wafers and a plurality of required energy levels for making clear marks on the plurality of wafers; measuring a reflectivity value of the wafer; determining an energy level for laser marking the wafer using the reflectivity value, wherein the step of determining the energy level comprises finding a corresponding one of the plurality of energy levels in the correlation using the reflectivity value determined in the step of measuring the reflectivity value of the wafer; and emitting a laser beam having the energy level to make laser marks on the wafer; wherein the step of establishing the correlation comprises: providing a plurality of sample wafers having different surface dielectric layers; determining the plurality of reflectivity values of the plurality of sample wafers; and laser marking each of the plurality of sample wafers to find a minimum required energy level for making a clear mark on each of the plurality of sample wafers.