Holographic techniques for generating high resolution telescopic

Details Holographic techniques for generating high resolution telescopic Holographic techniques for generating high resolution telescopic

1992-05-04

1994-02-01

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Having particular recording medium

359 4, 359 24, 359 30, 359399, G03H 102, G03H 126, G02B 2300

Patent

active

052836720

ABSTRACT:
Holographic apparatus and methods are provided for generating high resolution telescopic images using low cost, small aperture lenses. Holographic media, such as photorefractive crystals, are used in conjunction with multiple and/or synthetic aperture techniques. In a multiple aperture system, a thin nonlinear holographic medium is used with a plurality of small optical lenses to compensate for the inherent piston and tilt errors of the lenses, thereby providing higher resolution. In another embodiment, synthetic aperture techniques are accomplished by illuminating a far field object with coherent light, deriving a reference beam from the coherent light, and changing the position of the reference beam in accordance with a computational formula. A hologram is formed from a sequence of image exposures in the holographic media, each made at different positions with respect to the image. The sequence of exposures is combined and phased in the holographic media to synthesize a high resolution image normally achievable only with a relatively larger aperture.

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