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    • Sally Cole Johnson

    Editor in Chief
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    Sally Cole Johnson, Laser Focus World’s editor in chief, is a science and technology journalist who specializes in physics and semiconductors. She wrote for the American Institute of Physics for more than 15 years, complexity for the Santa Fe Institute, and theoretical physics and neuroscience for the Kavli Foundation.

    (Image credit: USGS)
    Estimated net decrease in U.S. gross domestic product at different levels of restrictions of China's net exports of gallium (a) or germanium (b) by industry.
    Optics

    Germanium and gallium supply chain disruption escalates for U.S.

    Sally Cole Johnson
    Jan. 20, 2025
    China bans exports of gallium and germanium, critical materials for optics and photonics, to the U.S.
    (Photo credit: Konstantin Vodopyanov/CREOL)
    The team’s dual-comb spectroscopy system produces precise and stable frequencies.
    Lasers & Sources

    Ultrabroadband UV frequency combs show promise for high-res atomic and molecular spectroscopy

    Sally Cole Johnson
    Jan. 15, 2025
    High-res dual-comb spectroscopy system generates light across two ultrabroadband ultraviolet (UV) spectral regions.
    (Image credit: Xuchen Wang)
    FIGURE 1. A time-varying resonant metasurface: The meta-atom is described by time-modulated surface capacitance and a constant surface inductance. A red arrow depicts a surface eigenmode with amplitude growing in time because its wavenumber is within the metasurface’s momentum bandgap.
    Optics

    Photonic time crystals reimagined

    Sally Cole Johnson
    Jan. 9, 2025
    By expanding the momentum bandgap of photonic time crystals via resonant structures, researchers make a crucial advance toward practical photonic time crystals at optical frequencies...