公开(公告)号：EP2616209A1

公开(公告)日：2013-07-24

申请号：EP10857363.5

申请日：2010-09-13

申请人： IPG Photonics Corporation

发明人： MORONI, Giovanni ,  COLOMBO, Daniele ,  PREVITALI, Barbara ,  CATTANEO, Stefano ,  ROSSOTTI, Lorenzo

IPC分类号： B23K26/36 ,  B23K26/04 ,  H01S3/10

CPC分类号： B23K26/0608 ,  H01S3/005 ,  H01S3/2383

摘要： A high power fiber laser system for processing a workpiece is configured with a plurality of laser modules each having an output feeding fiber which supports and guides laser radiation towards the workpiece, and a fiber combiner formed upon coupling the output feeding fibers together and outputting the combined laser radiation into a delivery fiber. The combiner is configured so that the combined laser radiation has a minimally possible beam quality factor (M2). The high power laser system further includes a laser head receiving the combined laser radiation and focusing the latter on the surface of the workpiece so as cause a backreflected radiation to propagate backwards through the laser head, delivery fiber and combiner towards the laser modules. The fiber laser system also is provided with a monitoring assembly receiving the backreflected radiation and operative to detect the spectrum thereof.