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A New Breed of Tunable Lasers

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by Krista D. Zanolli CAMBRIDGE, England -- A new technology using liquid crystals in concert with a single, laser-based light source is spawning a new breed of low cost, reliable and extremely useful tunable lasers. Liquid crystal (LC) lasers offer unprecedented depths of color resolution and could soon be used in displays, medical diagnostics and sensors, according to researchers. Polychromatic laser emission from a gradient pitch liquid crystal cell, pumped from a single optical source. (Images: University of Cambridge Department of Engineering) Engineers at the Centre of...Read full article

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    Published: April 2009
    Glossary
    infrared
    Infrared (IR) refers to the region of the electromagnetic spectrum with wavelengths longer than those of visible light, but shorter than those of microwaves. The infrared spectrum spans wavelengths roughly between 700 nanometers (nm) and 1 millimeter (mm). It is divided into three main subcategories: Near-infrared (NIR): Wavelengths from approximately 700 nm to 1.4 micrometers (µm). Near-infrared light is often used in telecommunications, as well as in various imaging and sensing...
    linewidth
    1. The range of frequencies or wavelengths over which radiations are absorbed or emitted in a transition between a specific pair of atomic energy levels. The full width is determined between half-power points of the line. 2. In a laser, the range of frequencies over which most of the beam energy is distributed.
    liquid crystal
    Liquid crystals are a state of matter that exhibits properties intermediate between those of conventional liquids and solid crystals. In a liquid crystal, the molecules are ordered like those in a crystal, but they can still flow like a liquid. This unique combination of structural order and fluidity gives liquid crystals their distinctive characteristics and makes them valuable in various technological applications, particularly in display technology. Key features and characteristics of...
    wavelength
    Electromagnetic energy is transmitted in the form of a sinusoidal wave. The wavelength is the physical distance covered by one cycle of this wave; it is inversely proportional to frequency.
    benchtopcell phoneCMMPECommunicationsConsumercosmosDisplaysEPSRCHarry ColesholographicinfraredlasingLCLC laserLCDlinewidthliquid crystalmedical diagnosticsNews & FeaturesOLEDspolymericRGBSensors & Detectorssolid-statespeckletelecommunicationsTunable LasersTVwavelengthLasers

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