Laser beam energy modification to reduce back-wall strikes during laser drilling
US10632568B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 2016 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Apr 29, 2037 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K26/0734
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.