Patent ID: 8658937
Filing Date: 2014-02-25
Classification: B23K,G03F,H01L

Abstract:
1. A method for processing material located on at least three or more of a top, top bevel, apex, bottom bevel, or bottom edges of a semiconductor wafer, the method comprising: a. rotating the wafer on a chuck in an ambient gas; b. delivering a beam of laser radiation from two more locations to the three or more of the top, top bevel, apex, bottom bevel, or bottom edges of the semiconductor wafer to permit interaction of the laser radiation, semiconductor wafer, and the ambient gas, without heating the semiconductor wafer, and further wherein laser radiation is delivered along substantially equal optical paths extending from each of the two locations to three or more of the top, top bevel, apex, bottom bevel, and bottom edges of the substrate; and c. evacuating by-products of the interaction of the laser radiation, semiconductor wafer, and the ambient gas.