Patent Number: 6,295,168

Title: Refractive optical system that converts a laser beam to a collimated flat-top beam

Abstract: An optical system having a first positive optical element having an aspherical surface; and a second positive optical element having an aspherical surface. The first and second optical elements are arranged in a Keplerian configuration. The aspheric surface of the second optical element is related to the aspheric surface of the first optical element by a ray-tracing function that maps substantially all of an input light beam that is incident to the first optical element to a collimated output light beam that is output from the second optical element. The input light beam has a first axially-symmetric intensity distribution, such as a Gaussian intensity distribution, and the output light beam has a second axially-symmetric intensity distribution, such as a continuous, sigmoidal intensity distribution. Preferably, the output light beam has a Fermi-Dirac intensity distribution, and the ray-tracing function maps the input light beam to the output beam to a 1/e.sup.6 intensity radius of the input light beam.

Inventors: Hoffnagle; John Allen (San Jose, CA), Jefferson; Carl Michael (San Jose, CA)

Assignee: International Business Machines Corporation

International Classification: G02B 13/18 (20060101); G02B 27/09 (20060101); G03F 7/20 (20060101); G02B 013/18 ()

Expiration Date: 09/25/2018