Reduction of noise in computer generated holograms

Details Reduction of noise in computer generated holograms Reduction of noise in computer generated holograms

1989-08-31

1991-05-21

Dzierzynski, Paul M.

Radiation imagery chemistry: process, composition, or product th

Post imaging processing

Physical developing

350 369, 350 377, 430 1, 430 2, G03H 120, G03H 108

Patent

active

050169530

ABSTRACT:
Noise is reduced in computer generated holograms (CGH's) by a method of overexposure. The CGH is used to make a master hologram. The master hologram is then used to make a copy from which a succession of other copy holograms is made. Each successive copy hologram is exposed less than the prior ones while increasing brightness uniformity. Consequently, a decreasing amount of change in exposure is required to reach 100% efficiency. The number and orientation of the copy holograms is incorporated into the design of the final optical element. The final hologram is not overexposed, since the amount of exposure has been reduced from the earlier holograms, and can be used in complex optical power systems.

REFERENCES:
patent: 4832424 (1989-05-01), McGrew
Dickson, "Method for Producing Sub-Master Holograms," IBM Technical Disclosure Bulletin, vol. 24, No. 4, Sep. 1981, pp. 1896-1897.

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