Q-switched co2 - laser - material processing system with acousto-optical modulators

摘要

The object of the invention is a q-switched co₂-Laser - material processing system with acousto-optical modulators (aom), which, on the one hand to the q-switch of the co intracavity₂-Laser and, on the other hand, external to the extremely efficient suppression of the radiation coupling between laser and the rear of the workpiece to be used. The basic idea here is the targeted into account the frequency shift of the radiation diffracted at the aom, the precisely of the excitation frequency of the acoustic wave in the aom - crystal, under the aspect of the radiation amplification in the active medium. Since this frequency shift the radiation gain is reduced significantly, it must be avoided during the quality of the circuit process, which according to the invention by means of a traveling submerged of two aom with the same excitation frequency, but the opposite running direction of the acoustic waves in the crystal. In contrast, the frequency shift advantageous in the case of the suppression of the radiation coupling between laser and the rear of the workpiece if, according to the invention between the laser output and the workpiece a aom with at least such a high excitation frequency of the acoustic wave is provided, that the shaft from the returning into the laser active medium practically is not amplified if the diffracted beam on the aom uses as a working jet.