Emission spectra of terahertz quantum cascade laser

We calculated energy levels, wave functions, and energies of radiative transitions in terahertz quantum cascade lasers based on GaAs/Al0.15Ga0.85As heterostructures. Current-voltage characteristics and current dependences of laser radiation intensity were measured, and the maximum operating temperatures reaching 85 K were determined. Radiation spectra of quantum cascade lasers were measured for different temperatures, and the effect of intensity “pumping” from lowfrequency modes to high-frequency modes was found to happen in the case of an increase in the current and time delay of the signal capture, which is explained by heating of the sample during a pulse of the current. Application of the lasers for registration of impurity photoconductivity signals in semiconductor heterostructures was demonstrated

Study of methods for lowering the lasing frequency of a terahertz quantum-cascade laser based on two quantum wells

Two mechanisms for achieving lower terahertz range frequencies in quantum cascade structures with two quantum wells based on GaAs/AlGaAs compounds are proposed. The first mechanism is based on the introduction of composite quantum wells consisting of a narrow (~2 nm) quantum well with a low potential barrier, being within the main wide quantum well. The second mechanism is based on barriers with unequal heights, arranged in front of and behind the composite quantum well. Optimized quantum cascade laser structures emitting in the regions of ~2.15 and ~1.35 THz are calculated

Study of methods for lowering the lasing frequency of a terahertz quantum-cascade laser based on two quantum wells

Two mechanisms for achieving lower terahertz range frequencies in quantum cascade structures with two quantum wells based on GaAs/AlGaAs compounds are proposed. The first mechanism is based on the introduction of composite quantum wells consisting of a narrow (~2 nm) quantum well with a low potential barrier, being within the main wide quantum well. The second mechanism is based on barriers with unequal heights, arranged in front of and behind the composite quantum well. Optimized quantum cascade laser structures emitting in the regions of ~2.15 and ~1.35 THz are calculated

Rashba spin splitting and exchange enhancement of the g factor in InAs/AlSb heterostructures with a two-dimensional electron gas

International audienc

Cyclotron resonance stydy in InAs/AlSb quantum well heterostructures with two occupied electronic subbands

International audienc