High energy pulse suppression method
US7616669B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 2004 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Feb 12, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K3/0038
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser processes a workpiece with laser pulses delivered at random time intervals and at substantially constant energy levels by characterizing the laser cavity discharge behavior and utilizing that information for adjusting dummy pulse time periods to compensate for the energy errors. Dummy pulses are laser pulses that are blocked from reaching a workpiece. A second way for providing constant pulse energies employs an AOM for varying amounts of laser energy passed to the workpiece. A third way of providing constant pulse energies entails extending the pulse period of selected pulses to allow additional laser cavity charging time whenever a dummy pulse is initiated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.