US 5,479,273 A · Hologram construction

Abstract

The method involves directing first and second separate illuminating beams towards a photosensitive film from separate fixed apparent beam source positions respectively in such a manner that the beams are caused to overlap at the point of incidence at the photosensitive film. Stationary interference fringes are generated and the beams are caused to scan in a raster type pattern over the photosensitive film in such a manner whereby overlapping of the beams is maintained throughout the exposure of the film. The apparatus in one embodiment involves the generation of a third illuminating beam which is used to control means to control an associated scanner to effect synchronised movement of the second beam with the first beam. A further embodiment involves memorising the scanning movement of beam in a memory and using the memorised scanning pattern to control the scanner to maintain beam overlap.

Claims9

Dependent claims

A hologram constructed according to a method including the steps of;

directing at least first and second separate illuminating beams towards a photosensitive film from respective separate independent apparent beam source positions which are at respective fixed points in space;
overlapping the first and second illuminating beams where they are incident at the photosensitive film;
generating stationary interference fringes in the region of the overlapping beams;
and,
moving the first and second illuminating beams relative to the photosensitive film in a manner which maintains said overlapping throughout exposure of the photosensitive film to record the stationary interference fringes and to form a hologram of substantially larger area than said overlapping beams.

2 more elements

Apparatus for constructing a hologram, the apparatus comprising;

at least one light emitter;
beam splitting means for directing light emanating from said at least one light emitter into first and second separate illuminating beams;
two separate moveable optical means which are arranged for directing the first and second illuminating beams towards a photosensitive film from respective apparent beam source positions which are at respective fixed points in space;
and,
independent control means for controlling movement of the moveable optical means respectively, where by the first and second separate illuminating beams are directed towards the two separate movable optical means respectively and therefrom towards the photosensitive film where it is arranged that the beams overlap at the point where they are incident at the photosensitive film to thereby generate stationary interference fringes and the independent control means are adapted to move the first and second illuminating beams respectively relative to the photosensitive film in a manner which maintains said overlap throughout exposure of the photosensitive film to record the stationary interference fringes.

2 more elements

Dependencies are inferred from the claim text.

Hologram construction

Life of this patent

Hologram construction

Life of this patent

Abstract

Claims9