Laser surface treatment
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United States of America Patent
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Sep 27, 2011
Grant Date -
Sep 28, 2006
app pub date -
Mar 27, 2006
filing date -
Mar 28, 2005
priority date (Note) -
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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.
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