公开(公告)号：US20240207974A1

公开(公告)日：2024-06-27

申请号：US18288136

申请日：2022-05-03

Applicant: PowerPhotonic Ltd.

Inventor： Eoin Murphy ,  Gilles Diederich ,  Natalia Trela-McDonald ,  Roy McBride

IPC: B23K26/073 ,  G02B27/09

CPC classification number: B23K26/0734 ,  G02B27/0927 ,  G02B27/095

Abstract: An optical beam shaping element to perform beam shaping of multi-mode laser beams where a uniform ring-shaped intensity distribution is produced at a focal length of a focusing lens. The optical beam shaping element with a surface having radial arms which are twisted to be curved in comparison to a known Siemens star beam shaper giving a spiral configuration. Embodiments are described in which each of the arms in the spiral structure is additionally modified with radially varied slope and/or curvature to optimise far field distribution. Relative rotation between two optical beam shaping elements forms an adjustable trident to vary power between the ring and a centre spot. The optical beam shaping element finds application in laser material processing were the spiral curvature removes hotspots and can be configured to improve through focus performance and input sensitivity.