3.4-THz quantum cascade laser based on longitudinal-optical-phonon scattering for depopulation

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A 1.8-THz quantum cascade laser operating significantly above the temperature of ℏω/kB (2011, background): “The injector region has also remained a common feature of terahertz QCLs across different design”
Terahertz quantum cascade lasers (2007, neutral): “The two most common active region designs used today are the resonant-phonon design [9] and the bound-to-continuum design [10].”
High-power terahertz quantum cascade lasers (2006, background): “[5], with the exception that the heavily doped layer under the active region was 0.”
Real-time imaging using a 4.3-THz quantum cascade laser and a 320 /spl times/ 240 microbolometer focal-plane array (2006, background): “The THz quantum cascade laser (QCL) [4]–[6] has demonstrated high peak powers up to 250 mW [7], with spectral coverage from 1.”
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].”
Terahertz Heterodyne Receivers (2008, background): “Since the first demonstration of the laser effect [124], different concepts for the active medium as well as the waveguide have been demonstrated [124]–[126].”