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    • Volume 56, Issue 02

    More content from Volume 56, Issue 02

    To reduce persistent mid-spatial-frequency (MSF) surface components in the fabrication process for prototype mirrors for the European Extremely Large Telescope (E-ELT), researchers inserted an additional process step called “grolishing” between the grinding and polishing steps. The robot-driven grolishing step was driven via automatic computer control based on statistical design and analysis of data clouds.
    Data-cloud-based statistical design and analysis of experimentation enable low-cost, fast robotic control of a fabrication step for the European Extremely Large Telescope (E-ELT...
    Feb. 18, 2020
    (Image credit: Penn State)
    An optical metasurface consisting of silicon nanoantennas can, when illuminated with two laser lines closely spaced in frequency, produce nonreciprocal reflection. The effect results from traveling-wave refractive-index differences (spatiotemporal phase modulation) arising from the two laser lines.
    Phase modulation in both space and time allow an ultrathin optical metasurface to reflect near-infrared light in only one direction.
    Feb. 18, 2020
    Quantum efficiency (QE) as a function of wavelength for the C-RED 3 camera is shown at three different operating temperatures. The slight shift of response toward longer wavelengths and slight decrease in QE as temperature decreases should be inconsequential for normal use in AO for a FSO system. In addition, for portable FSO use at differing temperatures, the camera has an adaptive bias-plus-dark correction that is automatically updated based on any temperature changes.
    A shortwave-infrared (SWIR) camera for adaptive optical (AO) systems used in free-space optical communications is lightweight while maintaining low noise and high frame rate.
    Feb. 18, 2020
    (Image credit: Gerhard Litscher)
    A photobiomodulation helmet that emits about 15 W of light at an 810 nm wavelength is put to the test.
    Near-infrared light stimulates mitochondrial activity and is being tested in both animals and humans as a possible way to lessen cognitive dysfunction.
    Feb. 18, 2020
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    A silicon nanophotonic optical parametric oscillator (OPO) produces 700 and 1300 nm wavelengths from a 900 nm pump with a threshold power of only 0.9 mW.
    Feb. 18, 2020
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    Optical pyrometers that measure in the blue region “see” sapphire wafers from the start of the MOCVD process for microLEDs, improving manufacturing precision.
    Feb. 18, 2020
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    A new electrically pumped colloidal quantum dot LED (and, when optically pumped, a laser) bodes well for future inexpensive laser diodes.
    Feb. 18, 2020
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    At high-enough intensity, a circularly polarized femtosecond pulse with angular momentum dents a target due to radiation pressure, producing attosecond reflected vortex pulses...
    Feb. 18, 2020
    By thickening the i (intrinsic) semiconductor layer, the photoresponse of a silicon carbide (SiC) Schottky diode was boosted in the 270–350 nm region.
    Feb. 18, 2020
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    2019 was another record year for mergers & acquisitions in terms of both deal value and deal volume; however, M&A activity for pure-play photonics companies was down from recent...
    Feb. 18, 2020
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    Manufacturing of photonics components in volume brings a unique set of technical and commercial challenges that can be addressed by automation.
    Feb. 18, 2020