Green Laser Update

Several companies say they've made progress in developing better green lasers

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The hunt for a true green solid-state laser has stymied researchers around the world for decades. In recent months, though, several companies, including Japan’s Sumitomo Electric and Germany's Osram, have finally succeeded—at least in the lab. IEEE Spectrum's Jean Kumagai explains what these developments mean, why creating a green laser is so hard, and what a green laser is good for.

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