Low-threshold terahertz quantum-cascade lasers

By M. Rochat, L. Ajili, H. Willenberg, Jerome Faist, Harvey E. Beere, G. Davies, E. Linfield, David A. Ritchie. 2002

212 citations recorded by the source corpus.

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Electromagnetic modeling of terahertz quantum cascade laser waveguides and resonators (2005, methodology): “Recent research in THz QCLs has shown them to hold considerable potential as a source of coherent THz radiation for bridging the so-called "Terahertz Gap" [1, 2, 3].”
Imaging with terahertz radiation (2007, background): “Some imaging results have also been reported using continuous-wave (cw) THz radiation [39–46], spurred in large part by developments in cw THz sources such as the recent invention of terahertz quantum cascade lasers [47, 48] and the development of terahertz parametric oscillators [49].”
Technology, Capabilities, and Performance of Low Power Terahertz Sources (2011, background): “in 2001 [188], and several groups developed terahertz QCLs immediately after that [189], [190].”