High-temperature operation of distributed feedback quantum-cascade lasers at 5.3 μm

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Quantum cascade lasers: ultrahigh-speed operation, optical wireless communication, narrow linewidth, and far-infrared emission (2002, background): “Two recent band-structure engineering advances by Faist’s group at the University of Neuchatel include a double-phonon resonance three-quantum-well active region structure [40] that has enabled room-temperature CW operation [41], and the”
Bound-to-continuum and two-phonon resonance, quantum-cascade lasers for high duty cycle, high-temperature operation (2002, background): “The active regions is based on bound-to-continuum transition [30] or two phonon resonances [ 36 ].”
Terahertz semiconductor-heterostructure laser (2002, background): “, laser action has been shown only at much shorter wavelength”