DEVICE FOR DETERMINING A FOCUS POSITION OF A LASER BEAM IN A LASER MACHINING SYSTEM, LASER MACHINING SYSTEM COMPRISING SAME, AND METHOD FOR DETERMINING A FOCUS POSITION OF A LASER BEAM IN A LASER MACHINING SYSTEM

摘要

The present invention relates to a device (200) for determining a focus position (F) of a laser beam (10) in a laser machining system (100). The device (200) comprises: an optical element (210) which is designed to reflect a portion of the laser beam (10) in order to uncouple a first sub-beam (12) of the laser beam (10); a spatially-resolving sensor (230) to which the first sub-beam (12) is directed; and an evaluation unit (240) which is designed to determine a focus position (F) of the laser beam (10) on the basis of an actual diameter measurement of the first sub-beam (12) hitting the spatially-resolving sensor (230), a laser beam power, and calibration data.