Controlling laser processing via optical coherence topography

摘要

Scanning optical coherence topography (OCT) is a 3D imaging technique based on low-coherence interferometry. In recent days, itbecame a key technology in laser processing. The OCT probe beam is coupled co-axially to the laser beam into the processing opticsand provides depth information of the probe. Additional information is obtained when the OCT beam is deflected using a small fieldscanner attached to the processing optics. This report will present manifold applications for OCT process control, ranging frommonitoring the weld depth during the welding process, tracking joints in laser remote fillet welding, or localizing the position of pinsin three dimensions for precise positioning of the laser beam.