A method of creating an image inside a transparent material with the aid of a pulsed laser beam involves use of a diffraction limited Q-switched laser, in particular, a solid-state single-mode TEM.sub.00 laser; sharp focusing of the laser beam to provide an adjustable microdestruction in the material...http://www.google.de/patents/US5637244?utm_source=gb-gplus-sharePatent US5637244 - Method and apparatus for creating an image by a pulsed laser beam inside a transparent material
