A light condenser suitable for EUV lithography that includes reflective rings concentric to an optical axis. The expansion device is formed with a sleeve. Included is a plurality of gain stages that are distributed throughout the optical receiver. A locking connection occurs between the two housings, which can be established and detached again. Two of the mode transducers rotatably coupled with a suitable rotation mechanism may be used as a rotary waveguide joint. A light fixture is carried by the distal end of the elongate column.