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  • Volume 56, Issue 11

    • Volume 56, Issue 11

    More content from Volume 56, Issue 11

    2011 Lfw Nb3
    A compact, rugged LED-based light source containing a 4-mm-diameter integrating-sphere is useful for radiometric (intensity) calibration of fluorescence and other microscopes....
    Nov. 17, 2020
    Researchers developed a single-cavity laser that emits high-power dual-comb femtosecond pulses, paving the way for portable, robust dual-comb light sources targeted at precision...
    Nov. 17, 2020
    A year-long clinical study on 60 patients demonstrated that treatment with 9.3 µm laser radiation enhances resistance to tooth decay.
    Treatment of tooth enamel with 9.3 µm laser light drives off carbonate, hardening the enamel; the presence of fluoride causes further beneficial hardening.
    Nov. 17, 2020
    FIGURE 1. A broadband source and optical spectrum analyzer (OSA) setup requires no wavelength synchronization between the two instruments; when combined with the chip, the light can be collected and coupled to the OSA, which will then perform a sweep to record the spectral response of the PIC device under test.
    Selecting electrical or optical synchronization between tunable laser sources and optical power meters is key to accurate spectral characterization of passive optical PIC components...
    Nov. 17, 2020
    FIGURE 1. Schematic representation of a LSCI, showing the typical illumination, imaging, and image-processing methodologies.
    Valuable information—for example, surface roughness and dynamic flow—can be obtained by carefully analyzing the speckle pattern in an image.
    Nov. 17, 2020
    2011 Lfw Nb2
    An optical parametric oscillator based on a silicon nitride microring resonator has a wide tuning range in the visible and is mass-producible.
    Nov. 17, 2020
    2011 Lfw Nb1
    A hollow cylinder of laser light created by an axicon lens could guide cold (millikelvin-scale) atoms in ultrahigh vacuum, transporting them between chambers for experimentation...
    Nov. 17, 2020
    FIGURE 1. An optical profiler mounted on a robot provides roughness metrology for large or highly curved optics.
    A robot-mounted dynamic optical profiler provides automated roughness measurements for large and complex optics.
    Nov. 17, 2020
    (Image credit: SIOM)
    Experimental results for multiple source signals include the raw filtered signal (a) and the processed signals with positions at 0° (b) and -60° (c); (d), (e), and (f) are the corresponding spectrograms of (a), (b), and (c), respectively.
    A long fiber-optic acoustic sensor can, with a new algorithm, now distinguish among multiple acoustic signals spaced a distance away from the fiber.
    Nov. 17, 2020
    (Image credit: Newport/Oriel)
    FIGURE 1. Schematic of a photomultiplier tube (PMT); this example is of an end-on tube.
    The variety of photomultiplier tubes available is astounding, as are the many uses to which they are put.
    Nov. 17, 2020
    (Courtesy of Focuslight)
    FIGURE 1. An AL01 1064 nm laser module for lidar.
    Finite-element method (FEM) simulations reduce potential thermal and stress risks when designing packaging structures for high-power laser-diodes.
    Nov. 11, 2020
    2011 Lfw Bf1
    Recent photonics stock performance plus the very successful IPOs of autotech and quantum information companies shows the potential value of photonics companies.
    Nov. 2, 2020
    2105 Lfw Lpms Supp 9a
    Laser Focus World Advanced Technology Product Video Demo Days, an interactive event platform that aggregates videos from the photonics community as well as those from related ...
    Nov. 2, 2020
    Yongjian Yang, et al., npj Computational Materials, September 17, 2020
    Voids in silica glass (yellow), which are responsible for scattering of light and degradation of signals, become much smaller when the glass is quenched at higher pressures.
    Heating and quenching silica glass at a presser of 4 GPa theoretically reduces Rayleigh scattering, potentially increasing light transmission.
    Oct. 19, 2020
    (Image: Ali Passian, ORNL, U.S. Dept. of Energy)
    Laser pulses move through an optical fiber, stimulating the electrons on the metal nanotip to form surface plasmons, assisting electrons to leave the tip. Previous fiber-optic nanotip electron guns have all required external laser pulses, which are difficult to align with the fiber tip in experiments.
    The fiber-optic nanotip electron source for research is the first to be driven by laser pulses from inside the fiber.
    Sept. 14, 2020