Tunable cyclotron resonance-laser in p-Ge

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Abstract
Stimulated far infrared radiation is observed due to cyclotron emission in the light hole band of p-Ge. For the first time the authors have observed in samples with an acceptor concentration of 8*1012 cm-3 an extended lasing range between 1.4 and 3.7 T, corresponding to a frequency range between 28 and 76 cm-1. For a higher doping of 5*1013 cm-3 the magnetic field range lies between 3 and 4.5 T with frequencies between 60 and 90 cm-1. For the latter sample they have found a maximum output power of 0.3 W. They have carried out a detailed study of the emission frequency and of cyclotron resonance absorption as a function of the applied magnetic field. A substantially improved calculation of the Landau levels in crossed fields including non-parabolicity effects was performed, to make a quantitative assignment of the transitions involved.