Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-04-15
1999-03-23
Hellner, Mark
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359300, 359364, G02B 532, G02B 2608
Patent
active
058868003
ABSTRACT:
A technique for correcting wavefront aberrations introduced by large primary optical elements in portions of the electromagnetic spectrum. The aberrations of the primary element are first transferred to a beacon beam and this aberrated beam is interfered with a reference beam in a holographic medium. These beams are then turned off and a beam from a distant object, containing the same aberrations, is allowed to diffract from the hologram. The diffracted beam from the hologram contains the image of the distant object with aberrations removed. Use of this technique permits the construction of large optical elements inexpensively, since surface tolerances of the elements can be substantially relaxed.
REFERENCES:
patent: 4927251 (1990-05-01), Schoen
Aprahamian Robert
Clark George L.
Heflinger Lee O.
Munch Jesper
Wuerker Ralph Frederick
Hellner Mark
TRW Inc.
Yatsko Michael S.
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