26 September 2016 RT-CW: widely tunable semiconductor THz QCL sources
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Distinctive position of Terahertz (THz) frequencies (ν~0.3 -10 THz) in the electromagnetic spectrum with their lower quantum energy compared to IR and higher frequency compared to microwave range allows for many potential applications unique to them. Especially in the security side of the THz sensing applications, the distinct absorption spectra of explosives and related compounds in the range of 0.1–5 THz makes THz technology a competitive technique for detecting hidden explosives. A compact, high power, room temperature continuous wave terahertz source emitting in a wide frequency range will greatly boost the THz applications for the diagnosis and detection of explosives. Here we present a new strong-coupled strain-balanced quantum cascade laser design for efficient THz generation based intracavity DFG. Room temperature continuous wave operation with electrical frequency tuning range of 2.06-4.35 THz is demonstrated.
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M. Razeghi, M. Razeghi, Q. Y. Lu, Q. Y. Lu, "RT-CW: widely tunable semiconductor THz QCL sources", Proc. SPIE 9934, Terahertz Emitters, Receivers, and Applications VII, 993406 (26 September 2016); doi: 10.1117/12.2240398; https://doi.org/10.1117/12.2240398

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