Digital holography device

A device to determine the complex amplitude As(r,z) of a signal wave coming from an object illuminated by an illumination wave, the device comprising:

• detection means for detecting waves optoelectronically;
• means for generating two mutually coherent waves including said illumination wave and a reference wave, the two mutually coherent waves having a phase difference φi(t) that is a function of time;
• filtering means, positioned between the object and the detection means, for limiting to a given elementary angular field the signal wave coming from the object;
• means for inducing an interference, on the detection means, between the reference wave and said signal wave coming from the object and limited to said elementary angular field, the detection means enabling a temporal sampling of the interference pattern, resulting in an acquisition of a number N of interferograms Ii(r,t), N being greater than or equal to 2, each interferogram corresponding to a distinct phase difference between the signal wave and the reference wave incident on said detection means;
• processing means for calculating, based on said interferograms, the complex amplitude As(r,z) of said signal wave coming from the object and limited to said elementary angular field, resulting in an elementary digital hologram;
• and
• means to sweep through a set of elementary angular fields resulting in a set of elementary digital holograms, said processing means being configured to combine said set of elementary holograms to obtain a digital hologram of the object.