Patent ID: 7418172
Filing Date: 2008-08-26
Classification: G02B,H01S

Abstract:
1. A beam homogenizer comprising: an optical system for homogenizing energy distribution of a beam spot in one direction, the beam spot having a linear shape, the optical system comprising: first and second cylindrical lenses; and an optical waveguide including a pair of reflection planes provided oppositely, wherein the optical waveguide is provided between the first and second cylindrical lenses, wherein the one direction is a direction of a major axis of the linear shape, wherein the first cylindrical lens has a first surface and a second surface facing the optical waveguide and the second cylindrical lens has a third surface and a fourth surface, wherein a radius of curvature of the second surface is larger than that of the first surface, and wherein a radius of curvature of the fourth surface is larger than that of the third surface.