Holographic laser beam scanner

Details Holographic laser beam scanner Holographic laser beam scanner

1985-12-24

1988-06-28

Arnold, Bruce Y.

G02B 2610, G02B 100

Patent

active

047535024

ABSTRACT:
A laser beam scanner that includes a laser source emitting light at a frequency (X.sub.2) and a rotatable hologram produced by interfering lasers at a frequency (X.sub.1) and located a distance (a) from the laser source and a scanned surface at a distance (b) from the hologram. The hologram satisfies the image forming relationship 1/F.sub.1 =1/f.sub.0 +1/f.sub.R where F.sub.1 is the focal distance of the hologram and f.sub.0 and f.sub.R are the respective distances of the hologram from the divergent and convergent points where the interfering lasers are located. The laser source is located in a position away from the optical axis of the hologram so as to enlarge the diffraction angle. However, in order to compensate for resulting astigmatism, the hologram is produced by selecting the positions of the two interfering lasers in order to satisfy the image formation relationship in a region distant from the hologram optical axis and not to satisfy the image formation relationship on the optical axis.

REFERENCES:
patent: 4333006 (1982-06-01), Govin et al.
patent: 4378142 (1983-03-01), Ono
Ikeda et al, "Aberration Corrections for a POS Hologram Scanner," Applied Optics, vol. 18, No. 13, Jul. 1979, pp. 2166-2170.
Dickson et al, "Holography in the IBM 3687 Supermarket Scanner," IBM J. Res. Devlop, vol. 26, No. 2, Mar. 1982, pp. 228-234.
Lee, "Holographic Grating Scanners with Aberration Corrections," Applied Optics, vol. 16, No. 5, May 1977, pp. 1392-1399.
Ono et al., "Holographic Laser Scanners Using Generalized Zone Plates," Applied Optics, vol. 21, No. 24, Dec. 1982, pp. 4542-4548

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