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  • Volume 55, Issue 11

    • Volume 55, Issue 11

    (Courtesy of Mehdi Azimipour, University of California, Davis)
    FIGURE 1. images simultaneously acquired from the AO-SLO-OCT system developed by Mehdi Azimipour and his colleagues at the UC Davis show how the higher spatial resolution of SLO distinguishes rods from cones; OCT then quantifies the individual photoreceptor response.
    Richard Gaughan
    Nov. 19, 2019
    Optical coherence tomography and adaptive optics have made enormous contributions to retinal imaging, and a recent development incorporates both methods, along with a scanning...
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    John Lewis
    Nov. 19, 2019
    The Lasers & Photonics Marketplace Seminar will explore the impact of increasing economic uncertainty and changing markets on photonics businesses.
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    Conard Holton
    Nov. 19, 2019
    Photonics tools, especially hyperspectral imaging and spectroscopy, are aiding in agricultural production and protecting the food supply chain—more opportunity exists.
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    Gail Overton
    Nov. 19, 2019
    By using microfluidics to create liquid marbles and then assembling these marbles onto patterned substrates, arrays of convex or concave compound lenses can be created that mimic...

    More content from Volume 55, Issue 11

    FIGURE 1. These idler spectra are produced by fan-out-grating tuning of the Chromacity OPO. The spectral shapes are determined by the phase-matching characteristics of the OPO crystal and by the OPO pump-laser spectrum. Water absorption lines are visible at shorter wavelengths.
    Nov. 19, 2019
    An active long-range FTIR spectroscopy system can acquire high-resolution gas absorption spectra such as hydrocarbon emissions.
    FIGURE 1. Ultraviolet light sources span a series of wavelengths from 200 to 400 nm.
    Nov. 19, 2019
    With differences in spectral distribution, power level, and regulatory issues, UV LEDs challenge mercury arc lamps for disinfection, chromatography, and fluorescence imaging application...
    FIGURE 1. PVD thin film processes, including (a) evaporation, (b) plasma ion-assisted deposition (PIAD), and (c) ion beam sputtering (IBS).
    Pete Kupinski
    Nov. 19, 2019
    In addition to tradeoffs between mirror reflectivity, wavefront, laser-damage threshold, and cost, new low stress coatings offer weight, geometry, and thermomechanical performance...
    (Image credit: Adolfo De Sanctis, University of Exeter)
    FIGURE 1. To illustrate the charge funnel concept, when a non-uniform strain is applied to a semiconductor such as HfS2, the energy gap between the conduction and valence band is changed accordingly. Therefore, the formation of an energy gradient drives charges away from the strain region more efficiently than using an applied electric field.
    Nov. 19, 2019
    To break the physical 31% power conversion efficiency (PCE) limit for photovoltaics, inverse charge funneling effects in 2D strained semiconductors could enable hot-carrier solar...
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    John Lewis
    Nov. 19, 2019
    For the second year, Laser Focus World held its Innovators Awards program, which celebrates the disparate and innovative technologies, products, and systems found in the photonics...
    (Courtesy of Lingjie Kong)
    FIGURE 1. Optical scattering in turbid media, where ray tracing of a collimated beam from a homogeneous medium into a scattering tissue; the light diffuses after traveling 1 transport mean free path (TMFP). Ray tracing of the light emitted from a fluorophore inside a scattering tissue is also shown (b).
    Barbara Gefvert
    Nov. 19, 2019
    A novel approach pairs extended detection with computational reconstruction to proactively reduce tissue scattering, and thus enable high-quality wide-field images of structures...
    (Courtesy of II-VI)
    FIGURE 1. The 6 mm-mrad free-space rectangular BPP of the DirectProcess900 FlexShape laser engine by II-VI allows the laser to achieve spot sizes down to 0.2 mm.
    John Wallace
    Nov. 19, 2019
    All the benefits of laser diodes apply to direct-diode systems: small size, long life, and high wall-plug efficiency.
    (Credit: S. R. Sandoghchi)
    Microscopic cross-section of the record-setting low-loss hollow-core fiber. Thin hollow glass cylinders shown in pink run the length of the fiber, effectively creating bars that prevent the hexagonal light modes trapped in the center of the air-filled core from leaking into the glass. The hollow core, defined by the inner edges of the cylinders, is 37 µm across.
    Jeff Hecht
    Nov. 19, 2019
    If loss can be made low enough, hollow-core optical fiber could begin to take over the uses of conventional solid-core fiber.
    These visualizations show the three different types of frequency components that the new ICZT algorithm, as well as existing CZT algorithms, can handle (Re is the real axis; IM is the imaginary axis). The image at left shows an exponentially decaying frequency component; at center, the special case of a temporally unchanging frequency component; and at right, an exponentially growing frequency component.
    John Wallace
    Nov. 19, 2019
    The fast Fourier transform (FFT) and IFFT are key to many photonics-related algorithms; now, they are more useful than ever.
    The microscopy system captures multiple color images and converts them to a 16-bit high dynamic range grayscale image used for processing.
    James Carroll
    Nov. 19, 2019
    A microscope-based imaging system features custom software for ensuring proper coating thickness.
    National Institute of Information and Communications Technology
    NICT's experimental 1Pbit/s optical network testbed used three types of multicore fibers.
    John Wallace
    Oct. 18, 2019
    The 1 Pbit/s switching demo uses spatial-division multiplexing, multicore optical fibers, and large-scale spatial optical switching.
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    Schematic of the split Hopkinson pressure-bar setup.
    John Wallace
    Oct. 4, 2019
    Mechanical tests show how much current laser-based metal additive manufacturing techniques have improved over those from as recently as five years ago.