Abstract: A laser system for marking or perforating, including a laser tube and a head having an adjustable optical system with at least one focusing lens. The telescopic tube, a system of lenses for the light beam correction, and a deflexion system are integrally provided with the laser tube. In order to easily optimize the focal distance, a focusing lens is situated in a mobile tube of the telescopic tube which includes a mobile tube (17b) and a fixed tube (17a).

Abstract: The invention relates to a system for marking or perforating by laser and to a marking or perforation process in said system, which is comprised of at least one laser (19) which produces a beam, a supply unit for at least one laser (19), a control means (12) with a control program which controls the laser (19), a deflector (16) particularly an optical-acoustic deflector which produces different beam deflection angles, in this case an optical system traversed by the beam, which produces a marking or a perforation configured like a matrix of points (n.times.m) on a surface of a product in relative motion between the product to be marked or perforated and the laser beam. The supply unit and/or the deflector (16) may be controlled by the control program. The system of the invention provides for a dynamic control of the marking or perforation resolution in a vertical direction.