Patent ID: 6635845
Filing Date: 2003-10-21
Classification: B08B,B23K,H01L

Abstract:
A dry surface cleaning apparatus for removing surface contaminants on a surface of a workpiece comprising:a laser for generating a laser beam; a beam delivery control unit for splitting the laser beam into a first and a second laser beam, wherein the first and the second laser beam propagate along different directions from each other; a frequency modulator for modulating the second laser beam to generate a shorter wavelength laser beam, wherein the shorter wavelength laser beam has a shorter wavelength than that of the second laser beam and the shorter wavelength laser beam is used to directly detach the surface contaminants on the surface; and a laser focusing lens for converging the first laser beam on a laser focus around the surface of the workpiece to generate a plasma shock wave around the laser focus, wherein the plasma shock wave is used to clean the surface contaminants on the surface.