Patent ID: 7102118
Filing Date: 2006-09-05
Classification: B23K,C03B

Abstract:
1. An arrangement for introducing radiation energy into a workpiece made from a weakly absorbent material comprising: a radiation source and a resonator unit, wherein the resonator unit comprises a first resonator mirror and a second resonator mirror between which the workpiece is fixed; a beam-shaping unit shaping a ring-shaped beam bundle which has a central radiationless area and arranged in front of the resonator unit and the first resonator mirror being located in a radiationless central area behind a first focus point; said mirror having a hole that is just large enough to allow the beam bundle coming from the second focus point and traveling in the direction of the focusing mirror to pass through without being influenced and through which the beam bundle reflected by the second resonator mirror passes without being influenced and being focused a second time inside the workpiece in a second focus point before subsequently striking the first resonator mirror and being reflected back by the first resonator mirror into the workpiece.