METHOD AND APPARATUS FOR FINE-SCALE TEMPORAL CONTROL FOR LASER BEAM MATERIAL PROCESSING

The present application relates to a method and an apparatus. The method includes directing a laser beam (404) to a target (410) along a scan path at a variable scan velocity and adjusting a digital modulation during movement of the laser beam (404) along the scan path and in relation to the variabl...

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Bibliographische Detailangaben
Hauptverfasser:	MARTINSEN, Robert J, WANG, Qi
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADDITIVE MANUFACTURING TECHNOLOGY ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CASTING CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING MACHINE TOOLS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS POWDER METALLURGY SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM WORKING METALLIC POWDER WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	The present application relates to a method and an apparatus. The method includes directing a laser beam (404) to a target (410) along a scan path at a variable scan velocity and adjusting a digital modulation during movement of the laser beam (404) along the scan path and in relation to the variable scan velocity so as to provide a fluence at the target (410) within a predetermined fluence range along the scan path. the method can further include the step of adjusting a width of the laser beam (404) with a zoom beam expander (418). The apparatus (400) include a laser source (402) situated to emit a laser beam (404), a 3D scanner (408) situated to receive the laser beam (404) and to direct the laser beam (404) along a scan path in a scanning plane at the target (410), and a laser source digital modulator coupled to the laser source (402) so as to produce a fluence at the scanning plane along the scan path that is in a predetermined fluence range as the laser beam scan speed changes along the scan path.