DETERMINATION OF THE FAR-INFRARED EMISSION CHARACTERISTIC OF A CYCLOTRON PARA-GERMANIUM LASER BY USE OF A SUPERCONDUCTING NB DETECTOR

We studied the far-infrared emission characteristics of a cyclotron p-germanium laser using a broad-band superconducting Nb film detector. For magnetic fields between approximately 25 kOe and approximately 50 kOe, emission in a frequency range from approximately 50 cm-1 to approximately 100 cm-1 with maximum intensity around 90 cm-1 was obtained. We determined, for fixed magnetic fields, electric field dependences of the emission intensity taking into account that the total electric field is a sum of the applied and the Hall electric field. An analysis of the emission intensity characteristic gives evidence that transitions between the two lowest Landau levels of light holes are responsible for the laser action.