Imaging optics for material processing by laser irradiation and laser processing heads with such imaging optics

摘要

The invention pertains to imaging optics (20) for material machining by means of laser irradiation, with said focusing optics comprising collimator optics (21) for collimating the divergent working laser beam (121) and focusing optics (22) for focusing the working laser beam (12) on a workpiece (14) to be machined, wherein the collimating optics (21) comprise a first lens or lens group (211) with positive focal length for focusing a working laser beam source (18) in a virtual intermediate focal point and a second movable lens or lens group (212) with negative focal length for focusing the virtual intermediate focal point to infinity. The invention furthermore proposes a laser machining head (1) with a housing (10), through which a working laser beam (12) can be guided. The inventive imaging optics (20) serve for generating a working focal point (15).