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A group of researchers at the California Institute of Technology (Caltech) has created the optical equivalent of a tuning fork—a device that can help steady the electrical currents needed to power high-end electronics and stabilize the signals of high-quality lasers. The work marks the first time that such a device has been miniaturized to fit on a chip and may pave the way to improvements in high-speed communications, navigation, and remote sensing.

A photograph of the spiral chip-based optical resonator developed at Caltech, shown next to a quarter to provide scale. Credit: Hansuek Lee/Caltech

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