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Terahertz laser tuning comes down to the wire

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Marie Freebody, [email protected]

The progress of terahertz technology continues its steady march with news of a tunable terahertz laser developed by a group at MIT. Tunable terahertz lasers are particularly useful for sensing and spectroscopy applications because many biochemical species have strong spectral fingerprints at terahertz frequencies. Despite this, the terahertz range is among the most underdeveloped in the electromagnetic spectrum. This is largely a result of the “terahertz gap” between solid-state electronic devices and photonic devices. Qing Hu and colleagues have managed to overcome some of the...Read full article

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    Published: February 2010
    Glossary
    quantum cascade laser
    A quantum cascade laser (QCL) is a type of semiconductor laser that operates based on the principles of quantum mechanics. It is a versatile and powerful device used for emitting coherent light in the mid-infrared to terahertz range of the electromagnetic spectrum. Quantum cascade lasers were first proposed by Federico Capasso, Jerome Faist, Deborah Sivco, Carlo Sirtori, Albert Hutchinson, and Alfred Cho in 1994. Key features and principles of quantum cascade lasers: Quantum cascade...
    redshift
    The displacement of spectrum lines, as determined by the increasing distance between, and the relative velocity of, the observer and a light source, causing the lines to move toward the red portion of the spectrum. It is used in astrophysics to determine the rate of recession or expansion of celestial bodies. Also known as the Hubble effect.
    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...
    blueshiftFreebodyHuImagingMarie FreebodyMEMSMITNature PhotonicsOpticsQing Huquantum cascade laserredshiftResearch & Technologyscanning probesemiconductor laserssensingspectroscopyTech Pulseterahertzwire laserLasers

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