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The present invention concerns a laser engraving device (1) for engraving a target surface (17). The laser engraving device (1) comprises: a beam splitter (7) for dividing a processing laser beam (25) into a plurality of engraving laser beams (27); a first optical focusing element (11) with an adjustable focal 5 point for focusing the plurality of engraving laser beams (27) onto the target surface (17); and an optical sensor (19) configured to determine the distance between the target surface (17) and the optical sensor (19). The first optical focusing element (11) is connected to the optical sensor (19) by a data link (21) to receive the determined distance from the optical sensor (19). 10 Furthermore, the first optical focusing element (11) is configured to adjust its focal point based on the determined distance received from the optical sensor (19).
Christian Enz, Yves Bellouard, Assim Boukhayma, Andrea Kraxner, Olivier Bernard