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    • Volume 53, Issue 12

    More content from Volume 53, Issue 12

    (Courtesy of Seongwoo Yoo)
    Simulations of a Gaussian beam propagating through a conventional graded-index-core fiber without (a) and with (b) laser gain show the appearance of higher-order modes (HOMs). However, if a graded-index core is placed in a gain-guided and index-antiguided (GG + IAG) fiber design (not shown), fundamental-mode propagation is maintained even under amplification.
    Two researchers have taken a different approach to large-mode-area fiber design by changing the gain-guided and index-antiguided fiber design, which is conventionally step-index...
    Dec. 1, 2017
    Mean emission wavelengths for assigned molecules in AD and N brain tissues differ by excitation wavelength.
    Label-free optical spectroscopy may enable operational insight into Alzheimer's disease and perhaps even early diagnosis so that patients can make decisions while still cognitively...
    Dec. 1, 2017
    (Courtesy of Bilkent University and Middle East Technical University)
    A pulsed 1550 nm laser beam creates (a) 1 μm spherical structures (voxels) in silicon, as well as (b) rods created by nonlinear interactions of the beam as a function of the number of pulses applied. By scanning the laser beam to create voxel and rod patterns, in-chip structures such as a 600 × 600 pixel hologram of the Mona Lisa (c), as well as selectively etched structures (d and e) can be fabricated, further extending the possibilities for 3D silicon photonics.
    A team of researchers has fabricated "in-chip" microstructures and photonic devices deep within silicon using nonlinear laser lithography that enable dense, truly 3D silicon photonics...
    Dec. 1, 2017
    (Photo by Nick Gonzales)
    Plants grown in this luminescent solar concentrator (LSC)-equipped greenhouse fared as well or better than plants grown in conventional greenhouses; these LSCs convert about 4% of the sunlight striking them to electricity.
    Brightly colored research greenhouses equipped with electricity-producing luminescent solar concentrators take light only from the spectral regions that are less needed by the...
    Dec. 1, 2017
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    A biosensor that uses polydimethylsiloxane (PDMS) dye-doped optical fibers is more thermally and environmentally stable than when using hydrogel fibers.
    Dec. 1, 2017
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    The design contains a laser-plasma wakefield accelerator to produce a high-quality relativistic electron beam, and a terahertz light source capable of producing a single-cycle...
    Dec. 1, 2017
    The material takes on superconductive properties, albeit extremely briefly, up to a temperature of -73°C-almost 100 degrees above the critical equilibrium temperature.
    Dec. 1, 2017
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    A new multiphoton excitation technique allows on-demand optogenetic photostimulation of custom neuron ensembles.
    Dec. 1, 2017
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    Researchers at the Free-Electron Laser in Hamburg have come up with a bolometric radiometer that is only 26 mm on a side, enabling easy measurement of a free-electron laser beam...
    Dec. 1, 2017
    Conard Holton2
    Although digital marketers can be accused of transforming "listicles" -- web articles in the form of lists -- into a simplistic tool for generating clicks, Laser Focus World has...
    Dec. 1, 2017
    Courtesy of WISTA-Management GmbH
    After investing about 1 billion euros of taxpayer money, Berlin-Adlershof has turned to Germany’s biggest technology park, creating several billion euros in revenue each year.
    The week of October 16, 2017 was Photonics Week in Berlin, and the local photonics community convened in Adlershof. The meeting attracted around 500 people. Not much for a big...
    Dec. 1, 2017
    FIGURE 1. Shown is the typical control loop used within an Observer-based digital servo.
    As laser materials processing applications become more challenging, digital servos must steer laser beams with higher precision, flexibility, and finesse than their analog predecessors...
    Dec. 1, 2017