Terahertz Emission in Asymmetric Quantum Wells by Frequency Mixing of Midinfrared Waves

Generation of terahertz (THz), and sub-THz, coherent waves has been demonstrated at room temperature in GaAs-AlGaAs asymmetric quantum wells by mixing two CO 2 laser beams. Two overlapping regimes were studied: the double resonance regime where three states are involved and the optical rectification...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2006-11, Vol.42 (11), p.1157-1174
Main Authors: Dupont, E., Wasilewski, Z.R., Liu, H.C.
Format: Article
Language:English
Subjects:
Asymmetry
Carbon dioxide
Coherence
Conversion
Difference frequency mixing
Diffraction
Emission
Exact sciences and technology
Frequency
Frequency mixing
Fundamental areas of phenomenology (including applications)
intersubband transitions
Laser beams
Laser theory
midinfrared
Nonlinear optics
Optical mixing
Optics
Physics
Quantum well lasers
Quantum wells
Resonance
Stimulated emission
Temperature
terahertz (THz) semiconductor emitter
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Description
Summary:Generation of terahertz (THz), and sub-THz, coherent waves has been demonstrated at room temperature in GaAs-AlGaAs asymmetric quantum wells by mixing two CO 2 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
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2006.882877