A laser or other source of radiant electromagnetic energy removes optically transparent material (e.g., LiNbO.sub.3) to form various structures. To enhance coupling the radiant energy to the optical material, a layer of an ablative absorber (e.g., a metal or organic material) can be used. Alternately,...http://www.google.de/patents/US4598039?utm_source=gb-gplus-sharePatent US4598039 - Formation of features in optical material
