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  • Volume 56, Issue 05

    • Volume 56, Issue 05

    More content from Volume 56, Issue 05

    (Image credit: Technical University of Darmstadt)
    The experimental setup (a) for the ghost communication demonstration exploits polarization correlations of unpolarized thermal light from an EDFA; unpolarized light is visualized by the Poincaré sphere with the dynamics of the instantaneous Stokes vector (b, red dots). The realized proof-of-principle communication between Bob and Alice is depicted by an encoding table for the “0” and “1” bits (c).
    Exploiting the infinite number of polarization states of unpolarized thermal light and their correlation properties leads to a new approach for secure data communications.
    May 19, 2020
    FIGURE 1. This image shows a poorly lit scene (a) and a zoomed-in region showing the effect of Gaussian noise (b).
    Block-matching, 3D filters, nonlinear means filtering, and Shearlet transform techniques show success in denoising images.
    May 19, 2020
    FIGURE 1. SS-OCT at megahertz speed is not as futuristic as it may seem: The OCTA 12 × 12 mm FOV scan (a) was captured in less than 2.5 s (at 1.7 million A-scans/second) and delivers the same quality as the image in (b), which took 25 s to scan using a 100 kHz system.
    An industry session at BiOS 2020 reveals where new developments are taking OCT.
    May 19, 2020
    (Image credit: NASA)
    FIGURE 1. OSLO, by Lambda Research Corporation, was used in the design and analysis of the James Webb Space Telescope (JWST).
    Having grown in capabilities over decades of development, modern optical-design software models, optimizes, and tolerances complex optical systems with ease.
    May 19, 2020
    (Image credit: J. Chhablani and G. Barteselli; Creative Commons Attribution-Share Alike 3.0 Unported license)
    OCT images, such as this one displaying signs of chorioretinopathy, contain anatomical insights into abnormal conditions; artificial intelligence (AI) can help mine clinical images to assist in diagnosis.
    Deep learning is used to segment ophthalmic OCT images in order to recognize the tear meniscus of the human eye.
    May 19, 2020
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    Due to its many spatiotemporally interfering lasing modes, the “entropy-creating” laser diode produces random bits at a speed on the order of 100 Tbit/s.
    May 19, 2020
    2105 Lfw Lpms Supp 9a
    Tapered double-clad fiber, lens-design software, spectroscopic imaging, seeing through opaque packaging, filtering techniques for denoising images, and OCT are featured in the...
    May 19, 2020
    Arianna M. Charbon, Kazuhiro Morimoto, Edoardo Charbon
    A megapixel photon-counting camera is based on single-photon avalanche diode (SPAD) image sensors. The new camera can capture images in faint light at unprecedented speeds.
    The megapixel SPAD array has max photon detection probability of 27% and a median dark-count rate of 2 counts/s.
    April 16, 2020
    (Image credit: SIOM)
    Schematic of a spatiotemporal plasma-lens filter.
    A plasma-lens filter (STPLF) passes the highest-intensity temporal pulse portions and scatters the lower-intensity prepulse while providing spatial filtering.
    April 16, 2020
    Conard Holton2
    Innovation and leadership will be the keys to successful short- and long-term responses to the pandemic.
    April 14, 2020
    HZDR / Juniks
    A new photodetector is based on layers of metal-organic frameworks.
    An iron-based metal-organic semiconductor in thin-film form detects visible through near-IR radiation.
    April 12, 2020
    (Image credit: Macquarie University)
    This diamond Raman laser produced by researchers at Macquarie University is pumped with light at 1018 nm to produce a 1178 nm output, which is then frequency-doubled to the 589 nm yellow sodium line. Used to produce guide stars in the upper atmosphere for adaptive optical systems in large ground-based telescopes, such a laser can do so at higher efficiency than existing lasers.
    Emitting at the yellow sodium line, a diamond Raman laser could also enable more point-like guide stars to be generated through AO systems.
    April 3, 2020
    (Image credit: Chung-Ang University)
    A novel algorithm for orienting a vehicle-mounted camera with respect to the outside environment consists of feature projection and line-structure detection (part 1, center), determining the vanishing point along the direction of driving, and determining the two other perpendicular vanishing points (part 2, bottom).
    A fast camera-orientation estimation algorithm that pinpoints vanishing points could make self-driving cars safer.
    March 2, 2020