Patent ID: 8937770
Filing Date: 2015-01-20
Classification: B23K,G02B,H01L

Abstract:
1. Optical apparatus for projecting an elongated beam spot on a working plane, the beam spot being derived from first and second laser beams, said apparatus having a long-axis, in which lies the length of the beam spot, and a short-axis in which lies the width of the beam spot, the apparatus comprising: first and second short-axis beam-homogenizers for homogenizing the first and second laser beams on the working plane in the short-axis; first and second short-axis focus-separating lenses cooperative with the first and second short-axis beam-homogenizers; a long-axis beam homogenizer for homogenizing the first and second laser beams on the working plane in the long-axis; projection optics for projecting the short-axis homogenized first and second beams in the working plane; and wherein the first and second short-axis beam-homogenizers, the short-axis focus-separating lenses, the long-axis beam-homogenizer, and the projection optics are configured and arranged such that the first and second laser-beams are aligned in the working plane in the long-axis parallel to each other defining the length of the beam-spot and have respectively first and second short-axis beam-widths centered around respectively first and second focal points spaced apart in the working plane in the short-axis.