Patent ID: 7135392

Claim:
A method of forming semiconductor P-N junctions in a substrate, comprising: ion implanting dopant impurities into said substrate; post-implant annealing said substrate by performing the following steps: (a) emitting light from an array of semiconductor laser emitters arranged in plural parallel rows that are parallel to a slow axis; (b) making multiple reflections across said slow axis of the light from said laser emitters between a pair of reflective surfaces of a light pipe separated from one another along the direction of said slow axis to produce a light beam homogenized along said slow axis; (c) focusing said homogenized light beam onto said substrate as line of light having a broad dimension along said slow axis and a narrow dimension along a fast axis generally perpendicular to said slow axis; and (d) scanning said line of light across the substrate in a scanning direction parallel to said fast axis.