Patent
1978-09-25
1980-09-23
Stern, Ronald J.
350 370, 350 385, G03H 112, G02B 532, G03H 122
Patent
active
042239753
ABSTRACT:
In the process of reconstruction of a virtual image of a light line having one end disposed at infinity with respect to the observer from a hologram of a shorter light line by shifting the position of the reconstructing light source relative to the hologram with respect to the position of the reference beam during formation of the hologram, aberrations are introduced which vary the attitude of the line image and the location of its end point as a function of the position of the observer with respect to the hologram. To correct the position of the infinity point in the image, a holographic optical element is formed using a two-step process. First a hologram is formed of a light source at apparent infinity. Next the conjugate aberrated image of the reference source used to form that hologram is reconstructed by illuminating the hologram with a beam different from the object beam, and finally, a second hologram is formed of the aberrated reference source thereby reconstructed and this second hologram is illuminated with a light beam conjugate to the reference beam used in its formation to produce either a reference beam for the formation of the light line hologram or a reconstruction beam for a conventional light line hologram.
REFERENCES:
patent: 3633986 (1972-01-01), Broussaud et al.
patent: 4012150 (1977-03-01), Upatnieks
Environmental research Institute of Michigan
Stern Ronald J.
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