Patent ID: 6393042
Filing Date: 2002-05-21
Classification: G02B,H01S

Abstract:
A beam homogenizer comprising:a first dividing optical lens for dividing one beam into (2n+1) beams in a first direction; a second dividing optical lens for dividing one beam into N(nâˆ’1) beams in a second direction perpendicular to the first direction; a first synthesizing lens for condensing light in the second direction and for synthesizing a plurality of beams divided in the second direction; and a second synthesizing lens for condensing light in the first direction and for synthesizing a plurality of beams divided in the first direction, wherein the second synthesizing lens includes (nâ€²âˆ’1) cylindrical lenses, wherein images obtained by orthogonal projection of respective principal points of the (nâ€²âˆ’1) cylindrical lenses onto a plane orthogonal to the second direction become (nâ€²âˆ’1) points arranged with an interval of d/(nâ€²âˆ’1) on a same line, wherein the character d designates an interval of peaks of interference fringes formed on an irradiation surface by the beam passing through one cylindrical lens of the second synthesizing lens, and wherein the character N designates a natural number, the character n designates an integer not less than 3, and the character nâ€² designates an integer satisfying 3&lE;nâ€²&lE;n.