Method and apparatus for correcting aberrations in photon collection devices
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United States of America Patent
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Apr 30, 2002
Grant Date -
N/A
app pub date -
Jul 28, 2000
filing date -
Jul 28, 2000
priority date (Note) -
Expired
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Abstract
A cover plate on a holographic optical element (HOE) device corrects for aberrations, such as spherical aberrations. The HOE device includes an emulsion material, having a recorded interference pattern that can perform diffraction, sandwiched between a first element and a second element, wherein the second element functions as the cover plate. One of the surfaces of the second element is aspheric to correct for aberrations. The aspheric shape of the surface adds approximately equal and approximately opposite aberrations associated with light rays diffracted by the recorded interference pattern, thereby substantially improving focus.
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