Patent ID: 11883903
Assignee: UNIVERSITE DE BORDEAUX
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 4:
5. The method according to claim 3, wherein the step of spatially splitting the laser beam is adapted to generate a plurality of M spatially-split beams, where M is a natural integer higher than or equal to three, the plurality of M spatially-split beams having a lateral offset relative to each other, taken two-by-two, and wherein
the step of spatial concentration of energy comprises spatially concentrating the energy of the plurality of M split beams in a plurality of M separated areas of the material, each split beam having an energy higher than a material modification threshold, and wherein an upper limit of the energy domain is fixed by the threshold of damages which are optically viewable, to the naked eye or using an optical microscope so as to produce a plurality of localized modifications in the plurality of M separated areas of the material without generating material ablation or microbubbles in the material; and
adjusting the distance between any two areas among the plurality of M separated areas, the distance (dx) being comprised between 1 micrometre and about ten micrometres, so as to initiate an oriented rectilinear micro-fracture between said any two areas among the plurality of M separated areas.