Self-reference holographic imaging system
AssigneesCentre National De La Recherche Scientifique, Universite Du Maine, Institut Des Molecules Et Materiaux Du Mans (Immm-Umr 6283)
InventorsPascal Picart, Mokrane Malek
Life of this patent
Estimating the term…
Abstract
A system for recording a digital hologram of an object comprises: a coherent source intended to illuminate the object and thus produce a wave diffracted by the object; and a digital sensor intended to record the digital hologram of the object. It furthermore comprises a spatial phase modulating assembly able to produce in the plane of the sensor a plurality of duplicates of the wave diffracted by the object, the duplicates being offset from each other but overlapping partially, these duplicates forming on the sensor a digital hologram of the object, this hologram being what is referred to as a self-reference hologram.
Claims13
A system for recording a digital hologram of an object, comprising:
- a partially coherent or coherent source intended to illuminate the object and thus produce a wave diffracted by the object;
- and
- a digital sensor intended to record the digital hologram of the object, characterized in that it furthermore comprises a spatial phase modulating assembly consisting of:
- a spatial phase modulator located between the object and the sensor, associated with:
- a first image-forming device able to form an image A″ of the object at a non-zero distance Δz1 from the spatial phase modulator;
- and
- a second image-forming device able to form:
- an image of the plane of the spatial phase modulator in a plane located at a non-zero distance Δz2 from a plane of the sensor;
- and
- an image A′ of the image A″ of the object, in a plane located at a distance Δz′ from the plane of the sensor,
- the modulating assembly being able to produce in the plane of the sensor a plurality of identical duplicates of the wave diffracted by the object, said identical duplicates being offset from each other but overlapping partially, the identical duplicates forming on the sensor a digital hologram of the object, the hologram being a self-reference hologram.
Dependencies are inferred from the claim text.