Removal of Adhering, Absorbing Material From Transparent Substrates
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Transparent substrates are often coated with an adhering, absorbing material, either intentionally (e.g., specific coatings or films) or unintentionally (e.g., dirt, spattered liquids, vapor deposition). Removal of the absorbing material, either over the entire interface or in a selected pattern, is important. A technique for removing adhering, absorbing material from a transparent substrate is described, where the substrate can be either cleaned or patterned in a nondestructive, onestep method. To remove the absorbing layer, the interface between the transparent substrate and the absorbing layer is irradiated by a laser beam shining through the transparent substrate, as indicated in Fig. 1A.