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    • Volume 55, Issue 08

    More content from Volume 55, Issue 08

    (Adapted from A. Orth et al. [Ref. 11])
    FIGURE 1. The tip of a 30,000-core optical fiber bundle is shown next to an Australian 5 cent coin for scale (left) and a zoomed-in image (right) reveals a small region of the fiber bundle facet (dashed red box in left). Each core is roughly 2 µm in diameter and separated from its neighbors by an average of 3.3 µm.
    With each fiber acting as an independent pixel, coherent fiber bundles transmit more information than just a 2D representation of an image; specifically, the spatial light field...
    Aug. 1, 2019
    FIGURE 1. In the scalable setting of a spatial photonic Ising machine, binary spins are encoded in the phase of a laser beam (green) by spatial modulation. Tailoring of the beam’s amplitude fixes spin-spin interaction. To find the ground-state spin configuration, the machine recurrently evolves according to a feedback signal from the camera plane. By design, maximizing the intensity in a target region (blue square) corresponds to a spin state with minimum energy.
    Researchers have built the largest photonic Ising machine to date—an optical processor for solving difficult optimization problems by modeling interacting spins via a spatially...
    Aug. 1, 2019
    (Image credit: U.S. Naval Research Laboratory)
    Shown are tuning curves for three quantum dots positioned on the waveguide at the locations shown in the inset, to achieve identical emission (a). High-resolution Fabry-Perot interferometer measurements show all three quantum dots simultaneously from an output coupler with identical emission wavelength (b).
    By squeezing quantum dots using unique semiconductor-based processes, coherent single photons are generated that can be used for on-chip quantum photonics that demand identical...
    Aug. 1, 2019
    Several rotationally symmetric cavities are etched into a silicon wafer for glassblowing of 0.9-mm-diameter (left) and 1.8 mm (right) axicons.
    Axicon lenses, which are useful for microfabrication, OCT, and other applications, can now be easily made in large quantities by glassblowing.
    Aug. 1, 2019
    A fast, low-cost, highly sensitive diffuse optical imaging system acquires optical transmission images dorsally to provide objective, quantitative analysis for rheumatoid arthritis (RA) diagnosis and monitoring.
    A noninvasive near-infrared diffuse optical imaging (DOI) system combines 3D digital imaging and infrared (IR) spectroscopy to map blood content in a patient’s hand for detection...
    Aug. 1, 2019
    (Image credit: University of California, Riverside)
    A microresonator pumped with a CW laser (a) produces a microcomb with stable or chaotic behavior, as well as pure quartic soliton (PQS) pulse trains depending on the pump frequency (b). A high-energy random initial state will evolve with time and settle to a stable pulse with near-Gaussian power profile (c) and uniform power spectrum having a remarkable 3 dB bandwidth (d).
    Microresonator-based pure quartic solitons (PQSs) efficiently convert CW laser light into frequency combs with the power uniformity of individual CW lasers.
    Aug. 1, 2019
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    Polymer optical fibers embedded with temperature-sensitive nanoparticles conform to the skin and endure large strain deformations that provide ratiometric temperature data, verified...
    Aug. 1, 2019
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    Most metasurface optics only accept plane-wave beams; a new hybrid metal-dielectric metastructure focuses a diverging Gaussian beam back on itself.
    Aug. 1, 2019
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    Designed for use while being cooled by liquid helium, a cryogenic objective mirror with an aspherical surface has a NA of 0.93 and a field radius of 36 µm, large enough to image...
    Aug. 1, 2019
    Built around a quantum-cascade laser (QCL), the first laser-based infrared spectroscopic ellipsometer will aid biologists and materials scientists.
    Aug. 1, 2019
    John Ambroseo, President and CEO of Coherent.
    An interview with the president and CEO of Coherent reveals a laser industry still changing, driven by commodization and continual advances in technologies and applications.
    Aug. 1, 2019
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    Editor in chief John Lewis introduces Laser Focus World’s August 2019 issue, which includes trends in photonics technologies, applications, and markets.
    Aug. 1, 2019