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Quantum dot lasers -- 1 dot makes all the difference

Physicists at NIST and Stanford and Northwestern Universities have built micron-sized solid-state lasers in which a single quantum dot can play a dominant role in the device's performance. These highly efficient optical devices could one day produce the ultimate low-power laser for telecommunications, optical computing and optical standards.

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1. NRL researchers develop optical technique for controlling electron spins in quantum dot ensembles
   11-15-2007 · EurekAlert!
   Scientists are closer to developing novel devices for optics-based quantum computing and quantum information processing, as a result of a breakthrough in understanding how to make all the spins in an ensemble of quantum dots identical.
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2. JILA solves problem of quantum dot 'blinking'
   01-23-2008 · EurekAlert!
   Scientists at JILA have found one possible way to induce quantum dots to emit photons faster and more consistently, without their characteristic blinking. The advance could make quantum dots more sensitive as fluorescent tags in biomedical tests and single-molecule studies and steadier sources of single photons for quantum encryption.
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3. Nano technique allows precise injection of living cells
   06-14-2007 · EurekAlert!
   Specialized pulsed lasers have been used to inject individual cells with a variety of materials, but little is known about how this type of injection might affect living cells. For the first time, researchers at Rensselaer Polytechnic Institute have analyzed this nanoscale injection process on living cells and discovered that minor changes in the intensity of the laser could mark the difference between a healthy cell and a dead one.
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4. NIST announces first observation of 'persistent flow' in a gas
   11-27-2007 · EurekAlert!
   Using laser light to stir an ultracold gas of atoms, researchers at NIST and the Joint Quantum Institute have demonstrated the first 'persistent' current in an ultracold atomic gas, a frictionless flow of particles. This form of superfluidity, might help bring to the surface some deep physics insights, and enable super-sensitive rotation sensors that could someday make navigation more precise.
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5. Laser sets records in power and energy efficiency
   07-23-2007 · EurekAlert!
   Northwestern University researchers have made strides in laser design, material growth and laser fabrication that have greatly increased the output power and wall-plug efficiency of quantum cascade lasers. They have demonstrated individual lasers, 300 of which can easily fit on a penny, emitting at wavelengths of 4.5 microns, capable of producing over 700 milliwatts of continuous output power at room temperature and more than one watt of output power at lower temperatures.
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6. Quantum effects make the difference
   03-02-2007 · EurekAlert!
   The atomic constituents of matter are never still, even at absolute zero (-273.15 degrees Celsius). This consequence of quantum mechanics can result in continuous transition between different material states. Physicists at the Max Planck Institute for Chemical Physics of Solids have studied this phenomenon using ytterbium, rhodium and silicon at very low temperatures under the varying influence of a magnetic field.
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7. New sensor detects gaseous chemical weapon surrogates in 45 seconds
   03-19-2007 · EurekAlert!
   Using lasers and tuning forks, Pacific Northwest National Laboratory scientists have developed a chemical weapon agent sensing technique that promises to meet or exceed current and emerging defense and homeland security chemical detection requirements. The technique, called Quartz Laser Photo-Acoustic Sensing, or "QPAS," is now ready for prototyping and field testing. PNNL has demonstrated QPAS's ability to detect gaseous nerve agent surrogates. The instrument is based on Laser Photo-Acoustic Sensing and infrared Quantum Cascade Lasers.
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8. Argonne researcher studies what makes quantum dots blink
   10-04-2007 · EurekAlert!
   In order to learn more about the origins of quantum dot blinking, researchers from the US Department of Energy's Argonne National Laboratory, the University of Chicago and the California Institute of Technology have developed a method to characterize it on faster time scales than have previously been accessed.
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9. Study: Long legs are more efficient
   03-12-2007 · EurekAlert!
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10. Researchers at UC-Santa Barbara have built the world's first mode-locked silicon evanescent laser
    08-21-2007 · EurekAlert!
    Researchers at UC-Santa Barbara have announced they have built the world's first mode-locked silicon evanescent laser, a significant step toward combining lasers and other key optical components with the existing electronic capabilities in silicon. The research will be reported in the Sept. 3 issue of Optics Express, and is published online today.
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