  We report on the recording of 3D optical memories in sol-gel materials by
using a non-linear absorption effect. This effect induces a local change of the
optical properties of the material which is read and quantified with a high
resolution full-field Optical Coherence Tomography setup. It is the first time
that this technique is used for this purpose. Data recording was performed by
focused picosecond (ps) single-pulse irradiation at 1064 nm with energy
densities of 10 and 33 J/cm2 per pulse.
