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VECSEL Eyed for Terahertz Sensing Applications

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A semiconductor laser that emits at terahertz frequencies could drive development of a new class of lasers for materials analysis and threat detection. The first vertical-external-cavity surface-emitting laser (VECSEL) capable of operating in this range, the device achieves output power >5 mW. For amplification it uses a metasurface mirror composed of subwavelength antenna-coupled quantum-cascade subcavities. A metasurface used to amplify a vertical-external-cavity surface-emitting laser that works in the terahertz range. Courtesy of UCLA Engineering . VECSELs that use visible...Read full article

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    Published: December 2015
    Glossary
    terahertz
    Terahertz (THz) refers to a unit of frequency in the electromagnetic spectrum, denoting waves with frequencies between 0.1 and 10 terahertz. One terahertz is equivalent to one trillion hertz, or cycles per second. The terahertz frequency range falls between the microwave and infrared regions of the electromagnetic spectrum. Key points about terahertz include: Frequency range: The terahertz range spans from approximately 0.1 terahertz (100 gigahertz) to 10 terahertz. This corresponds to...
    Research & Technologysemiconductor lasersAmericasCaliforniaLos AngelesUCLAterahertzTHzspectroscopySensors & DetectorsLasersLuyao XuBenjamin WilliamsTech Pulse

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