Abstract: A process for obtaining a material including a substrate coated on one of its sides with a coating including a functional layer, includes depositing the functional layer on the substrate, then depositing an absorbent layer on top of the functional layer, then performing a heat treatment by radiation, the radiation having at least one treatment wavelength between 200 and 2500 nm, the absorbent layer being in contact with air during the heat treatment, wherein the ab sorb ent layer ab sorbs at least 80% of the radiation used during the heat treatment and transmits less than 10% thereof.

Abstract: The present invention relates to a laser device for annealing coatings deposited on large-width substrates, said device being formed from a plurality of laser modules that may be juxtaposed without particular limitation, wherein the laser modules generate elementary laser lines that combine with one another in the length direction to form a single laser line, each elementary line having an overlap in the length direction with one or two adjacent elementary laser lines; and at least two adjacent elementary laser lines have an offset with respect to one another in the width direction, said offset being smaller than half the sum of the widths of said at least two adjacent elementary laser lines; the overlap of said at least two adjacent elementary laser lines is such that, in the absence of offset, the power-per-unit-length profile of the single laser line has a local maximum level with the zone of overlap.