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    • Volume 55, Issue 08

    More content from Volume 55, Issue 08

    FIGURE 1. This 905 nm four-channel surface-mount laser provides >480 W peak power.
    A four-channel laser and ultrafast driver delivers more than 480 W peak power in 2 ns pulses.
    Aug. 1, 2019
    FIGURE 1. Two laser resonators are depicted here: a linear resonator with output coupling at an end mirror, and a unidirectional ring laser.
    The design of a laser resonator is an essential part of a laser design and often a difficult task—learn how to determine required resonator mode properties and find suitable designs...
    Aug. 1, 2019
    FIGURE 1. Broad clinical applications of photobiomodulation therapy aim at reducing pain and inflammation while promoting healing and regeneration.
    When non-ionizing, non-thermal light treatment called photobiomodulation (PBM) therapy is used in the right dose and clinical context, this treatment can reduce pain and alleviate...
    Aug. 1, 2019
    (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
    1908 Lfw Nb F1
    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
    1908 Lfw Nb F2
    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
    1908 Lfw Nb F3
    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
    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