An apparatus and process for etching an image within a solid article including the steps of focusing a laser to a focal point within the article and positioning the article with respect to the focal point. The laser is fired so that local disruption occurs within the article to form the image within...http://www.google.es/patents/US5575936?utm_source=gb-gplus-sharePatente US5575936 - Process and apparatus for etching an image within a solid article
Process and apparatus for etching an image within a solid article
