Vorrichtung zum Fokussieren eines Lichtstrahles in mehreren Fokuspunkten

The description refers to a device for focussing a light beam in at least two focal points, comprising a mirror element, which splits the light beam in a number of partial beams corresponding to the number of focal points. The invention is characterized by the following features: - The mirror element has a number of mirror surfaces corresponding at least to the number of focal points, said mirror surfaces contacting a longitudinal line and whose surface normals along said line subtending an angle greater than or less than 0<degrees>, - the mirror element is movable to vary the beam intensity in each of the focal points and vary the distance of each focal point relative to the impinging light beam.