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A new device fills missing space in optics' arsenal of light measurement

Interferometers have myriad uses, from detecting gravitational waves to teasing apart the interactions of molecules within our bodies. The instruments make such minute measurements by manipulating beams of light using an optical delay—an effect that's typically achieved by adding length to one of the beam's path, which slows the signal down. The development opens up new ways of analyzing light beams in space instead of time.
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