公开(公告)号：US20180161939A1

公开(公告)日：2018-06-14

申请号：US15580931

申请日：2016-06-10

申请人： IPG PHOTONICS CORPORATION

发明人： Steven R. MAYNARD

IPC分类号： B23K26/382 ,  B23K26/073

CPC分类号： B23K26/382 ,  B23K26/073 ,  B23K26/0734

摘要： Systems and methods for laser drilling provide laser beam energy modification to reduce (e.g., eliminate or minimize) back-wall strikes during laser drilling. The systems and methods modify the process laser beam energy such that a beam energy at a central region of the process laser beam is less than a beam energy at an outer region of the process laser beam. In one example, the modified process beam has zero beam energy at the central region, thereby providing a “donut mode.” The laser beam energy modification may be achieved by detuning a fiber coupler in the Z axis such that laser energy is coupled into a cladding layer of the process fiber coupled to the laser fiber via the fiber coupler.