Generation of terahertz (THz), and sub-THz, coherent waves has been demonstrated at room temperature in GaAs–AlGaAs asymmetric quantum wells by mixing two CO₂ laser beams. Two overlapping regimes were studied: the double resonance regime where three states are involved and the optical rectification which relies on two states only. The measured conversion efficiency of ~ 10⁻⁷\ W⁻¹ is in reasonable agreement with theoretical predictions. In addition, this technique of THz generation provides a model system to study the emission profile from an ensemble of radiating dipoles. For instance, backward emission and strong diffraction effects have been observed.
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Dupont et al. (2006) studied this question.
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