Zero-order computer generated phase-only holograms

Details Zero-order computer generated phase-only holograms Zero-order computer generated phase-only holograms

2000-03-28

2000-12-26

Chang, Audrey

Optical: systems and elements

Holographic system or element

For synthetically generating a hologram

359 15, 359 1, 359565, 359569, G03H 108, G03H 100, G02B 532, G02B 2744

Patent

active

061668338

ABSTRACT:
A method for encoding zero-order phase-only holograms, and the holograms so encoded. The amplitude and phase of each point of a discrete mathematical transform, such as a Fourier transform, of an image to be encoded, are encoded as regions of a corresponding pixel of a transparent filter, with suitably selected fractional areas and optical path lengths. The various optical path lengths may be created by manipulating the filter's index of refraction, or by manipulating the thickness of the filter, preferably by etching. Various encoding schemes are presented, appropriate to etching systems with low lateral resolution, to etching systems with high lateral resolution but depth resolution limited to a discrete number of depths, and to etching systems with limited resolution both laterally and in depth.

REFERENCES:
patent: 4124843 (1978-11-01), Leger et al.
patent: 5633735 (1997-05-01), Hunter et al.

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