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Diffractive-beam-homogenizer-having-free-form-fringes

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Diffractive beam homogenizer having free-form fringes

Details

Inventors: Kathman, Alan D.; Feldman, Michael R.;
Assignee: Digital Optics Corporation (Charlotte, NC)
Primary Examiner: Spyrou; Cassandra C.
Assistant Examiner: Juba, Jr.; John
Attorney, Agent or Firm: Jones & Volentine, L.L.P.

A beam homogenizer that minimizes undesired intensity variations at the output plane caused by sharp breaks between facets in previous embodiments. The homogenizer includes a hologram made up of irregularly patterned diffractive fringes. An input beam illuminates at least part of the hologram. The hologram transmits a portion of the input beam onto an output plane. In doing so, the energy of the input beam is spatially redistributed at the output plane into a homogenized output beam having a preselected spatial energy distribution at the output plane. Thus, the illuminated portion of the output plane has a shape predetermined by the designer of the homogenizer.

DETAILED DESCRIPTION The invention is a beam homogenizer for converting an incident beam having a non-uniform spatial energy distribution into an output beam of preselected spatial energy distribution.
The incident beam is incident upon the beam homogenizer, formed as an array of facets where each facet is constructed to transmit any portion of the incident beam incident thereupon to an output plane spaced from the beam homogenizer so that the light transmitted through each of the facets overlap at the output plane to form the output beam which now has a substantially uniform spatial energy distribution.
Additionally, the invention is a beam homogenizer that minimizes undesired intensity variations at the output plane caused by sharp breaks between facets.
At least part of a hologram comprising irregularly patterned diffractive fringes is illuminated by an input beam.
That part transmits a portion of that beam onto an output plane, whereby the energy of the input beam is spatially redistributed at the output plane into a homogenized output beam having a preselected spatial energy distribution at the output plane such that the illuminated portion of the output plane is a predetermined shape and a predetermined magnitude.
Moreover, the invention is a beam homogenizer for converting a input beam having a non-uniform spatial energy distribution into an output beam having a preselected spatial energy distribution at an output plane while minimizing the intensity variation caused by breaks between facets.
An input beam illuminates at least some of the facet areas of a hologram.
The facet areas have irregularly patterned diffractive fringes.
The facet areas transmit a beam such that at an output plane, the majority of the portion of the input beam transmitted through each of said illuminated facet areas overlaps the portion of the input beam transmitted through at least one other illuminated facet whereby the energy of the input beam is spatially redistributed at the output plane into a homogenized output beam having a preselected spatial energy distribution at the output plane

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