Holographic disk scanner

Details Holographic disk scanner Holographic disk scanner

1977-12-09

1980-11-25

Stern, Ronald J.

350 361, G02B 532

Patent

active

042355044

ABSTRACT:
A light scanning apparatus comprises a disk having a plurality of holograms, and a laser beam source for radiating and directing a laser beam (which functions as a reproduction wave) onto the holograms in a sequential order, wherein each of the holograms converges the laser beam toward a corresponding focal point. While the disk and the laser beam are moved relative to each other, the focal point scans an object to be scanned in a particular scanning direction. The laser beam acting as a reproduction wave is preferably a spherical wave laser beam. The holograms are constructed by a process in which both a spherical wave laser, acting as a reference wave, and a plane wave laser are applied to a photosensitive layer which is to be constructed as the hologram, in which process the plane wave laser beam is applied onto the photosensitive layer at a predetermined gradient forming an offset angle between the direction in which the plane wave laser is oriented and the direction in which the photosensitive layer extends.

REFERENCES:
patent: 3940202 (1976-02-01), Kato et al.
Bryngdahl et al., Applied Optics, vol. 15, No. 1, Jan. 1976, pp. 183-194.
McMahon et al., Applied Optics, vol. 8, No. 2, Feb. 1969, pp. 399-402.

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