Terahertz semiconductor-heterostructure laser

By Rüdeger Köhler, A. Tredicucci, F. Beltram, Harvey E. Beere, E. Linfield, A. Davies, David A. Ritchie, R. Iotti, F. Rossi. Nature, 2002

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Terahertz Frequency Sensing and Imaging: A Time of Reckoning Future Applications? (2005, background): “Recent technology development efforts have started to address the previous lack of coherent sources and detectors in the THz range [13], [100], [101], [102] and this is opening up new application areas where the improved THz S&I capabilities now allow for practical advantages.”
Phase-locking of a 2.7-THz quantum cascade laser to a mode-locked erbium-doped fibre laser (2010, background): “To this extent terahertz quantum cascade lasers (QCLs”
Recent Progress in Terahertz Quantum Cascade Lasers (2011, positive): “There has been a spur of research activities in terms of technology development to advance the field of terahertz science [6], [7], of which, the advent of a terahertz semiconductor quantum cascade laser (QCL) [5] carries particular importance.”
Terahertz Band: The Last Piece of RF Spectrum Puzzle for Communication Systems (2019, background): “A revolutionary advancement in THz technology arose in 2002 when successful operation of a quantum cascade laser (QCL) at THz frequencies has been reported in [122].”