5. Holographic techniques

5.1 The principle of holography [35]

Consider the diagram in figure 11 . The two waves å _R and ∑ from the same coherent light source (here a ruby laser) are made to interfere in the H plane. The ∑ wave carries information about the object (amplitude and phase) and the ∑ _R wave, unperturbed by the object, is a reference wave.

Let, Ae ^jϕ and A _R $e^{\mathrm{j}{\phi }_{}}$