Patent ID: 7846816

Claim:
A process for producing a multilayer structure that includes, within the depth thereof, a separating layer, comprising: producing an initial multilayer structure comprising a base substrate, a surface substrate and, between the base substrate and the surface substrate, an absorbent layer that can absorb a light power flux in at least one zone and a liquefiable intermediate layer that includes, in at least one zone, impurities having a coefficient of segregation relative to the material constituting this intermediate layer of less than unity; and subjecting, in the form of at least one pulse, said initial structure to said light power flux, this light power flux being regulated so as to liquefy at least one portion of said intermediate layer under the effect of the propagation of the thermal energy, which results from the absorption of light power in said absorbent layer, from said absorbent layer into said intermediate layer and/or the absorption of light power by said intermediate layer, wherein due to the initial presence of said impurities, in a modification of at least one characteristic and/or of at least one property of said intermediate layer arising from the at least partial solidification of said intermediate layer, such that this intermediate layer at least partially constitutes a separating layer.