Beam expander and method for operating a beam expander

摘要

The present invention relates to a beam expander (100) with a receiving tube (105) with a light entry opening (107) and a light exit opening (109). Furthermore, the beam expander (100) comprises at least one optical unit (112) which is arranged in a beam path between the light entry opening (107) and the light exit opening (109) of the receiving tube (105) in a direction of movement (117) for changing a diameter of one via the light entry opening (107) coupled beam (110). The beam expander (100) also comprises a guide unit (120) coupled to the optical unit (112) for guiding the optical unit (112) in the receiving tube (105) and a linear drive coupling unit (125) mechanically coupled to the guide unit (120). in order to couple and / or transfer a movement or rotation of a drive element (127) into a movement of the guide unit (120).