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Low-Cost Quantum Cascade Laser Nears Reality

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Michael D. Wheeler

A team of researchers has designed a quantum cascade laser using one of the most common low-cost semiconductor compounds in the world: gallium arsenide (GaAs). The advance could prove important in sensing applications requiring mid-IR wavelengths such as pollution monitoring and the detection of illegal drugs. The research group, led by Carlo Sirtori at Central Laboratories of Thomson-CSF, in conjunction with researchers at the University of Neuchâtel and EPFL in Lausanne, Switzerland, designed quantum wells using GaAs and aluminum gallium arsenide (AlGaAs). They sandwiched wafers of...Read full article

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    Published: October 1998
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