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1. Reminders
The principles of optical holography are covered in the article
Most of these two articles are taken from the reference .
Conventional interferometers (of the Michelson or Mach-Zehnder type) are used to measure small optical path differences on flat surfaces (or surfaces of revolution) polished or observed in specular reflection. Holography has made it possible to extend interferometric measurements to three-dimensional scattering objects.
The general principle consists in superimposing light waves, not necessarily contemporary, at least one of which is produced by a hologram. In...
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Reminders
Double-exposure holographic interferometry
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