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ULTRASHORT LASER MICRO-TEXTURE PRINTING

  • US 20090268265A1
  • Filed: 06/30/2009
  • Published: 10/29/2009
  • Est. Priority Date: 01/23/2007
  • Status: Active Grant
First Claim
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1. A method of modifying a medium so that a grayscale image is obtainable from the medium, the method comprising:

  • providing a medium having a surface;

    scanning a laser beam relative to the surface, the laser beam comprising a plurality of optical pulses having a pulse width less than about 100 picoseconds, the laser beam delivering optical energy to the surface of the medium; and

    varying the optical energy delivered to different regions of the surface of the medium, thereby altering at least one of reflectivity, absorptivity, and diffractive properties of the regions to provide the grayscale image obtainable from the medium.

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