Recent Examples on the WebThose nanoparticles contain two rare-earth elements, erbium and ytterbium, which help convert the infrared light into a higher energy green light that mammal eyes can detect.
Courtney Linder, Popular Mechanics, 27 Aug. 2019 The beam excites the erbium atoms, which then add their energy to optical data signals passing through the fiber and boost the signals' power enough to carry them 50 miles or more before needing another boost.
Josh Mchugh, WIRED, 1 Aug. 2001
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