Holographic Interferometry is a powerful whole-field optical method allowing object surface displacement measurement in the micrometric to sub-micrometric ranges. Holographic Interferometry consists in producing the interference between two wavefronts, at least one of which is recorded as a hologram in photosensitive materials.

The recording step requires the superimposition of the object beam having traveled via the observed object and a coherent reference beam taken from the same light source. At the readout step, the hologram is illuminated by the same reference beam that has served for the recording.

Holography is being used in a growing number of applications. Progress in these areas has been partially stimulated by improvements in the technology for making holograms, with advances in both recording materials and the laser used to record holograms.