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Quantum Cascade Laser Array Provides Flexibility
for IR Spectroscopy

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Lynn M. Savage

Quantum cascade lasers — devices that can operate at infrared and terahertz wavelengths — are the only semiconductor lasers that can generate at room temperature wavelengths from 3 to 15 μm, the “molecular absorption fingerprint” region of the spectrum that is very important for chemical sensing. Single-mode emission is necessary for most such sensing applications. To achieve it, quantum cascade lasers can be processed as distributed feedback lasers, which have a built-in grating for mode selection, or they can be incorporated within an external cavity with a diffraction grating that...Read full article

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    Published: February 2008
    Glossary
    chemical sensing
    Chemical sensing refers to the detection and measurement of specific chemical compounds or substances in various environments or samples. It involves the use of sensors or analytical techniques to detect, identify, and quantify the presence of target molecules based on their chemical properties. Chemical sensing plays a crucial role in a wide range of fields, including environmental monitoring, industrial process control, biomedical diagnostics, food safety, and security. Principles of...
    chemical sensingCoatingsFeaturesquantum cascade lasersSensors & DetectorsSingle-mode emissionspectroscopy

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