Patent ID: 7092415
Filing Date: 2006-08-15
Classification: B23K,G02B

Abstract:
1. A laser system: a laser oscillator for producing a laser beam; a homogenizer provided between the laser oscillator and an object to be irradiated, the homogenizer comprising at least one multi-cylindrical lens; and a beam expander provided between the laser oscillator and the homogenizer, the beam expander comprising at least one lens, wherein the at least one multi-cylindrical lens comprises a plurality of convex cylindrical lenses and concave cylindrical lenses arranged alternately, wherein a convex surface of one of the convex cylindrical lenses and a concave surface of one of the concave cylindrical lenses adjacent to each other are smoothly continuous without having an angle therebetween, and wherein the at least one lens has a concave surface opposed to the laser oscillator.