Magnetic field induced luminescence spectra in a quantum cascade laser

We report on our study of the luminescence spectra of a quantum cascade las er in the presence of an external magnetic field tilted from the direction perpendicular to the electron plane. The effect of the tilted field is to a llow novel optical transitions because of the coupling of intersubband-cycl otron energies. We find that by tuning the applied field, one can get optic al transitions at different energies that are as sharp as the zero-field tr ansitions. (C) 2001 American Institute of Physics.