Refractive optical system that converts a laser beam to a collimated flat-top beam
US6295168A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1999 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/70075
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.