Holographic recording system with a separately recorded reference beam

Claim 2

An arrangement for constructing an holographic representation of an object by means of a source of coherent light which does not have reproducible wave fronts, said arrangement comprising: means for splitting a luminous beam emitted from said source into two reference beams having the same wave fronts; means for directing onto said object a portion of the luminous energy emerging from said source; a first photographic emulsion located for simultaneously receiving the light scattered by said object and at least one portion of the luminous energy contained in one of said reference beams for forming a first hologram; means for constructing from another portion of the luminous energy emerging from said source a punctual source of light; and a second photographic emulsion located for simultaneously receiving the luminous energy emerging from said punctual source and at least one portion of the luminous energy contained in said other reference beam for forming a second hologram.

Claim 3

A constructing arrangement as claimed in claim 1, wherein said object is illuminated by a portion of the luminous energy of said one reference beam; said punctual source of light being a scattering punctual element positioned for receiving a portion of the luminous energy contained in said other reference beam.

Claim 4

A constructing arrangement as claimed in claim 1, wherein said splitting means comprise a semitransparent plate.

Claim 5

A constructing arrangement as claimed in claim 1, wherein semitransparent plates are respectively positioned on the paths of said reference beams.

Claim 6

A constructing arrangement as claimed in claim 1, wherein said punctual source constructing means comprise a focusing optical combination.

Claim 7

A constructing arrangement as claimed in claim 5, wherein a pinhole diaphragm is positioned at the focus of said focusing optical combination.

Claim 8

A constructing arrangement as claimed in claim 1, wherein said emulsions are provided on distinct supports.

Claim 9

A constructing arrangement as claimed in claim 7, wherein said distinct supports are parallel to each other.

Claim 10

A constructing arrangement as claimed in claim 8, wherein said splitting means comprise a semitransparent plate parallel to said supports and at equal distances from them.

Claim 11

A constructing arrangement as claimed in claim 1, wherein said emulsions are positioned on a plane support.

Claim 12

A constructing arrangement as claimed in claim 10, wherein said splitting means comprise a semitransparent plate parallel to said support.

Claim 13

A constructing arrangement as claimed in claim 11, wherein said semitransparent plate lies on one of said emulsions; a reflecting plate parallel to said support being positioned for receiving one of said reference beams upon emerging from said semitransparent plate.

Claim 14

A reconstruction arrangement for reconstructing the image of an object from an holographic representation thereof constructed by an arrangement operated with a source of coherent light which does not have reproducible wave fronts, and comprising: means for splitting a luminous beam emitted from said source into two reference beams having the sAme wave fronts; means for directing onto said object a portion of the luminous energy emerging from said source; a first photographic emulsion located for simultaneously receiving the light scattered by said object and at least one portion of the luminous energy contained in one of said reference beams for forming a first hologram; means for constructing from another portion of the luminous energy emerging from said source a punctual source of light; and a second photographic emulsion located for simultaneously receiving the luminous energy emerging from said punctual source and at least one portion of the luminous energy contained in said other reference beam for forming a second hologram said first and second holograms being formed simultaneously; said reconstruction arrangement comprising a point source of spatially coherent light illuminating the portion of said holographic representation corresponding to said second emulsion for reconstructing a reference beam; and means for bringing said reference beam onto the remaining portion of said holographic representation.

Claim 15

A reconstruction arrangement for reconstructing the image of an object from an holographic representation thereof constructed by an arrangement operated with a source of coherent light which does not have reproducible wave fronts, and comprising: means for splitting a luminous beam emitted from said source into two reference beams having the sAme wave fronts; means for directing onto said object a portion of the luminous energy emerging from said source; a first photographic emulsion located for simultaneously receiving the light scattered by said object and at least one portion of the luminous energy contained in one of said reference beams for forming a first hologram; means for constructing from another portion of the luminous energy emerging from said source a punctual source of light; and a second photographic emulsion located for simultaneously receiving the luminous energy emerging from said punctual source and at least one portion of the luminous energy contained in said other reference beam for forming a second hologram said first and second holograms being formed simultaneously; said reconstruction arrangement comprising a point source of spatially coherent light illuminating the portion of said holographic representation corresponding to said second emulsion for reconstructing a reference beam; and means for bringing said reference beam onto the remaining portion of said holographic representation.

Claim 16

An arrangement as claimed in claim 13, wherein said holograms are carried by distinct supports facing each other.

Claim 17

An arrangement as claimed in claim 13 wherein said holograms are located at a distance from each other on a single-plane support.

Claim 18

A reconstruction arrangement as claimed in claim 13, wherein said last-mentioned means comprise a pair of parallel mirrors.

Claim 19

A constructing arrangement as claimed in claim 1, wherein said source is a pulsed laser.