Theoretical aspects
Optical holography - Principles

Let's denote by A and A_R the complex amplitudes respectively of the wave Σ scattered by the object and of the reference wave Σ _R (figure 4) at hologram H.

The total amplitude at point H is :A_H = A + A_R

The recording medium is sensitive to the light energy W it receives per unit area, i.e. the product of illuminance (or intensity I) and exposure time τ .

We have :W = I τ

Photographers call this product lumination. It is an energy density (a fluence) often expressed in µJ/cm².

Intensity is expressed as...