US Patent 8451873 Method and apparatus for reliably laser marking articles

Disclosed is a method for creating a mark desired properties on an anodized specimen and the mark itself. The method includes providing a laser marking system having a controllable laser pulse parameters, determining the laser pulse parameters associated with the desired properties and directing the laser marking system to mark the article using the selected laser pulse parameters. Laser marks so made have optical density that ranges from transparent to opaque, white color, texture indistinguishable from the surrounding article and durable, substantially intact anodization. The anodization may also be dyed and optionally bleached to create other colors.