New efficient, high brightness, and tunable Quantum cascade laser (QCL)s technologes from mid-wave infrared (MWIR) to Terahertz region promise chemical warfare agents & hidden explosives detectors, to infrared countermeasure (IRCM) systems

Compact, chip-based lasers have conquered much of the electromagnetic spectrum, from ultraviolet to infrared, enabling technologies from digital communications and barcode readers to laser pointers and printers. Diode lasers depend on the process of electron-hole recombination: an electron from the conduction band recombines with a hole in the valence band, and in the process a…