OPTICAL ELEMENT FOR FILTERING OUT UV PROCESS RADIATION, LASER MACHINING HEAD COMPRISING SUCH AN OPTICAL ELEMENT, AND CORRESPONDING LASER MACHINING METHOD

摘要

In a laser machining head (1) for laser machining workpieces (2) using a laser beam (3), an optical element (6) arranged in the beam path of the laser beam (3) is designed such that radiation components with a wavelength of less than 400 nm are filtered out of a process radiation (7) coming from the workpiece (2). Preferably, the at least one optical element (6) has a coating (8) which is transmissive for the laser wavelength of the laser beam (3) and is highly reflective for wavelengths of the process radiation (7) of less than 400 nm.