A Krieger wave converter was a technology developed by Dr. Nel Apgar in the 2360s. The converter was essentially a set of mirrors and dicosilium reflective coils to create Krieger waves. A series of energy pulses would be discharged from a Lambda field generator on the surface of Tanuga IV, aimed at the station and reflected and converted into Krieger waves. Although the wave converter was originally intended to provide a new energy source, Apgar had more sinister motives and developed the converter to be used as a weapon which would have been of more value to him. (TNG: "A Matter of Perspective")