Lidar detects reflections from single atoms at 100km, even in daylight

Seeking to measure high altitude winds 24 hours a day, the German Leibniz Institute for Atmospheric Physics (IAP) has created a lidar that can measure temperature and wind using returns from stray metals in the atmosphere at concentrations as low as one atom/cm3 100km away, according to German test and measurement firm Spectrum which provided electronics ...

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from Electronics Weekly https://www.electronicsweekly.com/news/research-news/lidar-detects-reflections-single-atoms-100km-even-daylight-2019-01/