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Laser Device Produces Dark Pulses

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GAITHERSBURG, Md., June 10, 2010 — Researchers have demonstrated a new type of pulsed laser that excels at not producing light. The new device generates sustained streams of "dark pulses" – repeated dips in light intensity – which is the opposite of the bright bursts in a typical pulsed laser. Despite its ominous name, the dark pulse laser is envisioned as a tool for benign communications and measurements based on infrared light frequencies. The laser's ultrashort pulses span just 90 picoseconds (trillionths of a second), making the device suitable for measurements on short timescales. Dark pulses might be...Read full article

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    Published: June 2010
    Glossary
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    quantum dots
    A quantum dot is a nanoscale semiconductor structure, typically composed of materials like cadmium selenide or indium arsenide, that exhibits unique quantum mechanical properties. These properties arise from the confinement of electrons within the dot, leading to discrete energy levels, or "quantization" of energy, similar to the behavior of individual atoms or molecules. Quantum dots have a size on the order of a few nanometers and can emit or absorb photons (light) with precise wavelengths,...
    Americasatomic clocksBasic ScienceCommunicationsdark pulse laserinfrared laserinfrared light frequenciesJILAlight intensityLight SourcesMarylandnanoNISToptical frequenciesoptical networkspulsed lasersquantum dotsResearch & Technologysemiconductor laser cavitysemiconductor laserssemiconductor nanostructuresTest & Measurementultrafast lasersultrashort pulsesUniversity of Colorado BoulderLasers

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