Patent ID: 7433372
Filing Date: 2008-10-07
Classification: G02B,H01S

Abstract:
1. A system for generating a laser line beam to crystallize a film, the system comprising; a laser source generating a laser beam having an non-symmetric intensity profile along an axis transverse to a beam propagation direction; a homogenizer for homogenizing the beam; optics for focusing the beam in a first axis and expanding the beam in a second axis; and a beam mixer positioned along a beam path between the laser source and homogenizer and oriented to increase intensity symmetry along the axis, the beam extending from a first edge to a second edge along the axis, the beam mixer comprising: a plurality of mirrors establishing a spatially inverting path, the inverting path having a beginning and an end and being characterized in that a part of the beam near the first beam edge at the beginning of the path translates to the second beam edge at the end of the path; an optic dividing the beam into first and second beam portions, the optic placing the first portion onto the inverting path and recombining the first and second portions onto a common path after the first portion has traveled along the inverting path thereby mixing the beam.