Abstract: A waveguide is arranged in radial extension on a support mounted in rotary manner and whose pivot pin is parallel to the laser beam axis. The outer end thereof intersects the laser beam during a rotation of the support and in each case detects a partial beam of the laser radiation. By means of the waveguide, said partial beam is supplied to a detector, which is arranged in fixed manner in the pivot pin of the support. A hollow waveguide or light guide serves as the waveguide. A parallel displacement of the pivot pin of the support is possible by means of a stepping motor to enable the complete beam profile to be determined by a plurality of sections through the laser beam. In place of the stepping motor, the support can be provided with several waveguides of different lengths, distributed with the same angular spacing over the support circumference and which successively supply the detected partial beams to the same detector.

Abstract: A device for measuring the power of a laser beam includes an electrically actuable measuring wire (10) having a temperature-dependent electrical resistance which is subjected to a relative reciprocatory movement transversely over the beam cross-section. A compensation wire having a temperature-dependent electrical resistance is disposed parallel to and closely adjoining the measuring wire (10), with each of the two wires (10, 11) having a different degree of absorption of laser radiation. A current source (12) connected to each of the two wires (10, 11), supplies a steady current thereto. A measuring device (13) is connected to each of the two wires (10, 11) and a dividing circuit (31) with a connected display device (33) is coupled to each measuring device (13) for processing the measured values of the measuring devices (13).