Abstract: A transformer includes a coil carrier having a first flange and a second flange. Primary and secondary coils are wound around the coil carrier between the first flange and the second flange. High-voltage contacts are located near the second flange and connected with the primary coil, and low-voltage contacts are located near the first flange and connected with the secondary coil. The first flange has a wall transverse to the coil carrier, and first and second sidewalls transverse to the wall so that the low-voltage contacts are surrounded on three sides by the wall and the first and second sidewalls.

Abstract: A passive region is provided adjacent the mirror surface of a laser. A mesa is formed with an end face parallel to the mirror surface to be formed. The passive region is grown against the end face, and the mirror surface is formed therein by cleaving. The passive region is provided exclusively at the area of the active region. The passive region is provided at the area of the active region preferably in the following manner: two depressions are formed in the layer structure of the laser at the area of the mirror surface to be formed, reaching down to the active layer. Then a portion of the active layer situated between the depressions is selectively removed, whereupon the passive region is grown starting from the depressions in the tubular cavity thus formed.