The present invention provides a method for scanning material with a laser beam including directing a laser beam (20) through a scanning means, wherein said scanning means includes a first lens (11) and a second lens (12) separated by a distance (16) approximately equal to the focal length of the lenses....http://www.google.com/patents/US6575963?utm_source=gb-gplus-sharePatent US6575963 - Laser scanning apparatus and method
