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Quantum cascade lasers have played a significant role in advancing the capabilities of laser technology, especially in the mid-IR and terahertz regions, opening up new possibilities for scientific research and practical applications.

Quantum cascade structure: Unlike traditional semiconductor lasers that use a single material to generate photons, QCLs employ a series of quantum wells arranged in a cascade structure. Each quantum well serves as an active region where electrons undergo energy transitions, emitting photons.

Security and defense: QCLs are used in trace gas detection for security and defense applications, such as identifying explosives or chemical warfare agents.

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Mid-infrared emission: Quantum cascade lasers are particularly well-suited for emitting light in the mid-infrared (mid-IR) region, which is important for applications such as gas sensing and trace gas analysis. The mid-IR range corresponds to molecular vibrational resonances, allowing for selective detection of various molecules.

Communication: QCLs can be used in free-space optical communication systems, especially in the terahertz frequency range.

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A quantum cascade laser (QCL) is a type of semiconductor laser that operates based on the principles of quantum mechanics. It is a versatile and powerful device used for emitting coherent light in the mid-infrared to terahertz range of the electromagnetic spectrum. Quantum cascade lasers were first proposed by Federico Capasso, Jerome Faist, Deborah Sivco, Carlo Sirtori, Albert Hutchinson, and Alfred Cho in 1994.

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Spectroscopy: QCLs are used in spectroscopic techniques, such as infrared absorption spectroscopy, for identifying and analyzing chemical compounds.

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Cascade process: The cascade structure allows for a multi-step or cascaded process of electron transitions between quantum wells. As electrons move through the cascade, they emit photons at different energies, collectively contributing to the laser output.

High power and efficiency: QCLs can achieve high optical power levels and exhibit high electrical-to-optical efficiency. This makes them valuable for applications where strong, coherent light sources are required.

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Wavelength tunability: The design of the quantum cascade structure enables precise engineering of the energy levels, allowing for fine control over the emitted wavelength. This tunability makes QCLs suitable for a wide range of applications, including spectroscopy, sensing, and communication.