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The most powerful laser in the US recently produced 2 quadrillion watts of power
(news.engin.umich.edu)
This is a most excellent place for technology news and articles.
That's 25 attoseconds, no?... If so, that's impressive.
The power record holder right now is the Măgurele laser in Romania, at 10 PW, but it lasts a thousand times longer, at 25 femtoseconds I believe. I can't find clear info on pulse duration anywhere. They do intend to decrease pulse durations it seems.