PINHOLE WITH A REFRACTIVE OR DIFFRACTIVE OPTICAL ELEMENT FOR THE SPATIAL-FREQUENCY FILTERING OF LASER BEAMS

摘要

The invention relates to a spatial-frequency filtering device for spatial-filtering laser radiation. To this end, the device comprises a transmission body that is at least partially transparent to the laser radiation, and comprises an element, which forms a pinhole or an aperture and which is arranged so that it is adjacent to the transmission body or is integrated in the transmission body. This pinhole-forming element comprises a diffractive and/or a refractive deflecting structure.