Abstract
Multi-quantum well III-V heterostructure materials have been used for the development of the unipolar quantum cascade (QC) laser operating in the mid-infrared.1 This scheme is now being extended to the far infrared (1 to 20 THz).2,3 The dynamics in this spectroscopic region, however, are very different from those in the mid-infrared. Non-radiative mechanisms (l.O phonon and carrier-carrier scattering) need to be considered carefully, as the associated energies are larger or comparable with the THz intersubband emission.
© 2001 Optical Society of America
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