Method for creating laser-induced color images within three-dimensional transparent media

Abstract

The present invention discloses a method for the production of laser-induced color images within three-dimensional transparent media, particularly inside the photosensitive glass. The latent image is created by focusing of IK ultra short (from femtosecond to picosecond) laser pulsed radiation into separate areas of the photosensitive glass, so that focal spot sizes are approximately equal to the resolution element of the created image. The latent image develops to the visible image by focusing of laser pulses at points of the latent image, so that focal spots are essentially smaller than the resolution element. During the latent image creation, the laser power is smaller than the breakdown threshold, but has enough value to create the radiation with broad spectrum. During the visible image development, the laser power increases the breakdown threshold, but the breakdown is generated in such a way that the laser-induced damage is practically invisible. The control of color and its intensity is produced during the creation of both the latent and visible images by changing the laser power value and the number of laser pulses focused at the predetermined area.

Dependencies are inferred from the claim text.