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SRLs
Semiconductor ring lasers (SRLs) made by researchers at the University of Glasgow (bottom left and right) are being used to develop optical logic and memory devices. Images: University of Glasgow. Light encircles an SRL in one of the two possible rotational directions. Looking at the output, you would see 'light' or 'dark', representing a 1 or 0 in a digital system in optical form. Top image: Institute of Photonics.
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