Arzneimittel Gmbh Apotheker Vetter & Co. Ravensburg

Feha Lasertec Gmbh

Prelatec Gmbh

Gisbert Staupendahl

Helmut Vetter

Herbert Walter

Jens Bliedtner

A Q-switched CO2 laser material processing system with acousto-optic modulators (AOM) is employed, on the one hand, inside the resonator for Q-switching the CO2 laser and, on the other hand, externally for efficient suppression of the radiation feedback between a laser and workpiece. The frequency shift of the radiation diffracted at the AOM is taken into account which exactly corresponds to the excitation frequency of the acoustic wave in the AOM crystal under the aspect of the amplification of the radiation in the active medium. Since this frequency shift significantly reduces the amplification of the radiation, it has to be avoided in the Q-switching process, which is achieved, by means of a tandem of two AOMs with identical excitation frequencies but with the acoustic waves propagating in opposite directions in the crystal. The frequency shift advantageously suppresses radiation feedback between the laser and workpiece.

Q-switched CO2-laser material machining system comprising acousto-optic modulators

The present invention is a method and system for the drilling of holes in a workpiece within a diameter range of 20 &#x3bc;m to 500 &#x3bc;m by means of laser radiation. The invention utilizes the beam quality of a laser beam as well as: the polarization of the laser radiation; the parameters of the impulses of the laser used; and, the type and pressure of the process gas used. The method and system utilize means for focusing laser radiation, in particular the ratio of the beam diameter at the site of the focusing element and its focal distance, and wherein the focusing is done in coordination with the beam quality number and wave length and other factors. A first working gas supports the formation of the hole shape and accelerates the drilling process; and, a second working gas is utilized to improve the surface quality of the drilling walls.

Method for boring bottle-like holes having a defined geometry by means of pulsed laser radiation

A solid workpiece, e.g. a glass tube, is shaped by a focussed beam of visible light or light in an adjacent portion of the electromagnetic spectrum in a material removal, cutting or drilling operation and is heat-treated or remelted or shaped in a plastic state by heating that second beam which is less focussed or even divergent. The beams derive from a common source, a CO.sub.2 laser, and pass through a splitting deflecting system so that the beams can be directed simultaneously either parallel to one another or with an inclination to one another at the same or different regions of the workpiece which is held in a holder capable of both rotating the workpiece and translating same.

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Jena, Germany

Gisbert Staupendahl