Due to the inherent difficulties in practical applications of a complete twophoton absorption effect modeling, an user friendly phenomelogical expression was derived from sensibilization experimental data:
D(x,t) = 3,63 10-8 ?E(x,t) x IL2(x)
The saturation effect was not considered,so the validity of this expression has its limit at this point.
In the case of recording lines with the displacement of the High Resolution Plate (HRP) or of the laser spot, the energy density has its value changed by the movement. Consequently, the static modeling may not be applied directly. Then, we have developed the calculation of the incident dynamic energy density, with application in the phenomena, that results a dynamic phenomenological modeling which describes the optical density function in the direction transversal to the movement.
