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Quantum Cascade Lasers: Valuable New Tools for Laser Spectroscopy

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Capable of mid-IR emission at room temperatures, quantum cascade lasers enable laser spectroscopy in the spectral region of strong molecular signatures.

Dr. Christian Mann and Prof. Joachim Wagner, Fraunhofer Institut für Angewandte Festkörperphysik, and Dr. Ulrike Tauer and Dr. Marcus Braun, Fraunhofer Institut für Physikalische Messtechnik

Semiconductor lasers emitting in the mid-infrared spectral range between approximately 4 and 13 μm are attractive for a number of applications, such as trace-gas sensing, production and environmental control, medical diagnostics, and free-space optical communications in the atmospheric transparency windows. Because the fundamental rotational-vibrational transitions of most molecules are in the mid-IR, absorption lines are much stronger there than in the near-IR overtone range, and trace-gas sensing can be performed with higher sensitivity. Making use of optical detection techniques,...Read full article

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    Published: February 2005
    absorption linesCommunicationsConsumerFeaturesindustrialmid-IRmoleculessemiconductor lasers

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