Quantum-cascade lasers (QCLs) are semiconductor lasers that emit in the mid- to far- infrared portion of the electromagnetic spectrum and were first demonstrated by Jérôme Faist, Federico Capasso, Deborah Sivco, Carlo Sirtori, Albert Hutchinson, and …

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In a QCL, these quantum effects are taken to an extreme by utilizing tens or even hundreds of quantum wells to decouple the emission wavelength from the bandgap energy entirely.

Advances in fabrication techniques coupled with the versatility of the QCL’s emission range have made it an attractive laser source with potential for use in a variety of MIR applications.

QCL IR microscopy is a new and exciting field. We explain the basics of quantum cascade lasers and go into detail why infrared laser imaging is the next step in infrared spectroscopy. What is a QCL or quantum cascade laser ? In short, it is a tunable Mid-IR laser - …

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Quantum Cascade Lasers (QCL) are semiconductor lasers that emit in the mid- and long-wave IR bands, and are finding new applications in precision sensing, spectroscopy, medical, and military applications (1).

The quantum cascade laser is a special kind of semiconductor laser, usually emitting mid- infrared light. Such a laser operates on laser transitions not between different electronic bands but on intersubband transitions of a semiconductor structure.

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Quantum cascade lasers are semiconductor lasers that offer peak emission in the mid-IR range (4 to 10 μm). These devices are an excellent light source for mid-IR applications, such as molecular gas analysis and absorption spectroscopy.