Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-02-20
1993-01-26
Lerner, Martin
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 18, 359 19, 359569, G02B 532, G02B 2610
Patent
active
051826593
ABSTRACT:
A system that provides a structure which makes use of a recording geometry in which no significant Seidel induced aberrations arise. The recording geometry results in a pattern recorded on a photosensitive surface, thereby creating the hologram on the scanning disc. Reconstruction of the recorded object may be made by exposing the scanning disc to substantially monochromatic light. The hologram on the scanning disc not only directs the reconstruction beam, but also focuses it. An optical element may be used during reconstruction to correct for bow and linearity, and also optimize flatness of the focal plane. Reconstruction also involves achromatization, or correction of beam placement because of mode hops or drift in laser frequency. The reconstruction comprises both pre-scan holograms and post-scan holograms. Recording of the post-scan hologram is achieved with a plurality of lenses which possess different collimating properties in the vertical and horizontal planes. Further, a method is provided in which a scanning disc may be replicated on various transparent materials.
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Clay Burton R.
Rowe David M.
Holographix Inc.
Lerner Martin
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