PROCESS AND DEVICE FOR TREATING A MATERIAL WITH A LASER.

摘要

In a process for treating a material with a laser (1), with identification of the material to be treated, the laser light is directed onto the material by means of a laser optical system (3) and the light re-emitted by the material is directed onto a detector (8) which measures its intensity. The laser output or energy is controlled by an evaluation circuit (9) connected downstream. To control the laser and/or an optical switch (2) arranged in the path of the laser output beam, the rate of variation of the intensity of the light incident on the detector is evaluated in relation to the rate of variation of the laser pulse. In the time that elapses between the beginning of the laser pulse and the occurrence of dielectric rupture, the intensity of the light re-emitted by the material is measured in at least one predetermined spectral range and used to identify the material on which the laser pulse impinges.