Abstract
Basing on measurements, computer simulations and calculations of transport properties in GaAs-GaAlAs superlattices (SL) with narrow (weak) barriers we propose and elaborate scheme of the SL Wannier-Stark (W.-S.) THz lasers. The laser transitions (tunable by applied voltage) are between levels of the first and the second W.-S. ladders corresponding to wells separated two-three periods apart and being nearby the resonant condition. The resonance provides high value of the transition matrix element that gives value of THz amplification coefficient up to 200-300 cm-1 for the doping 5–10·1015 cm−3. This value is substantially higher than the one for THz quantum cascade lasers and allows to use in the lasers simple n+−SL-n+ waveguide. Some observations on transport in the SLs are given.
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