Laser surface treatment
US8026459B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 27, 2006 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Sep 5, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser surface treatment for reducing reflection loss on the surface of an optical material is provided. A metal film is formed on the surface of the optical material, and then the metal film is removed from the optical material by irradiation of an ultra-intense short-pulse laser beam having a pulse width of 1 femtosecond to 100 picoseconds, so that a fine periodic structure is formed on the surface of the optical material exposed by the removal of the metal film. The obtained fine periodic structure has asperities with a periodic interval of preferably 50 to 1000 nm, which can be controlled by changing the laser energy density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.