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  • Volume 42, Issue 12
  • Volume 42, Issue 12

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    Lasers & Sources

    Coherent CEO speaks out on blocked acquisition

    Dec. 1, 2006
    Coherent (Santa Clara, CA) President and CEO John Ambroseo used the occasion of the company’s fourth quarter fiscal 2006 conference call on Nov. 1 to speak out strongly about ...
    FIGURE 1. An adiabatic inverted-taper structure couples light from an InP laser diode (not shown) from a polyimide waveguide layer into an SOI waveguide (green) on silicon.
    Research

    TECHNOLOGY REVIEW 2006: The exotic and the everyday spur innovation

    Dec. 1, 2006
    Basic research nourishes the growth of photonic metamaterials and plasmonics, while the desires of the consumer result in laser TV and higher-capacity optical disks. At the center...
    Conard Holton2
    Detectors & Imaging

    A multispectral world view

    Dec. 1, 2006
    To extract more information from images, camera and system vendors are turning to multispectral imaging.

    More content from Volume 42, Issue 12

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    Test & Measurement

    BIOLOGICAL IMAGING: Optofluidics reinvents the microscope

    Dec. 1, 2006
    The invention of microscopy between the 16th and 17th centuries enabled the direct viewing of cells and other microsize objects for the first time.
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    Lasers & Sources

    SEMICONDUCTOR LASERS: Optically pumped semiconductor lasers expand the scope of potential applications

    Dec. 1, 2006
    OPS technology is finding increased use because of its wavelength and power scalability, as well as other important benefits, including extremely low amplitude noise and longer...
    FIGURE 1. A new cladding process developed at the Fraunhofer Center for Surface and Laser Processing utilizes a 3 kW direct diode laser and a coaxial powder-feeding nozzle.
    Lasers & Sources

    OPTOELECTRONIC APPLICATIONS: Materials Processing - Diode lasers test their mettle in surface treatment

    Dec. 1, 2006
    Multikilowatt diodes are challenging Nd:YAG and CO2 systems for welding, hardening, alloying, and cladding of metal products.
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    Optics

    VIBRATION-CONTROL SYSTEMS: Table improves optical systems from the ground up

    Dec. 1, 2006
    Photolithography and the semiconductor industry are facing a critical juncture.
    FIGURE 1. A typical single-photon-counting microcell includes a photon-counting diode and internal resistor (left). An SPM is a large array of single microcells, each of which responds to individual photons, placing a fixed charge on the output node in response to each photon (center). A 50 μm “aggressive” SPM has 302 microcells 50 μm in size in a 1 × 1 mm array, or 1930 in a 3 × 3 mm array (right).
    Detectors & Imaging

    LOW-LIGHT-LEVEL DETECTORS: Silicon photomultipliers replace vacuum-tube technology

    Dec. 1, 2006
    Composed of arrays of silicon Geiger-mode avalanche photodiodes, solid-state silicon photomultipliers are small and rugged; in many applications, they can replace photomultiplier...
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    Research

    Upconversion fluorescence achieved through incoherent excitation with sunlight

    Dec. 1, 2006
    Researchers at the Max Planck Institute for Polymer Research (MPI-P; Mainz, Germany) and Sony Deutschland, Materials Science Laboratory (Stuttgart, Germany) have demonstrated ...
    FIGURE 1. The common definition for extreme-ultraviolet is 1 to 100 nm, but the boundaries are not well defined. The EUV spectrum is shown above, along with the shortest wavelengths generated by various methods.
    Lasers & Sources

    PHOTONIC FRONTIERS: EXTREME-UV SOURCES: Coherent light sources reach the extreme-ultraviolet

    Dec. 1, 2006
    Free-electron lasers, excitation with high-power short-pulse lasers, high-intensity pulsed discharges, and high-order harmonic generation have brought the extreme-ultraviolet ...
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    Optics

    Hinode observatory reveals new details of solar atmosphere

    Dec. 1, 2006
    This image of the Sun was taken Oct. 28 by the X-Ray Telescope (XRT) on the Hinode spacecraft observatory, intended to investigate solar magnetic variability and space weather...
    Rutile nanoparticles with a uniform size smaller than 10 nm are fabricated by laser pyrolysis; added to a transparent polymer, the particles boost the refractive index of the polymer without causing scattering of light.
    Research

    OPTICAL MATERIALS: Laser pyrolysis produces photonic nanomaterials

    Dec. 1, 2006
    Laser pyrolysis is a gas-phase process in which light at 10.6 µm from a continuous-wave carbon dioxide (CO2) laser is absorbed by a material in a flowing gas stream; the absorbed...
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    Fiber Optics

    Square-core jacketed air-clad fiber produces uniform field

    Dec. 1, 2006
    Square glass rods have always been one of the best ways to create a uniform field of light from a laser beam (except for laser-speckle effects); such a field can be useful for...