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COVER STORY

High-Average-Power Ultrafast Lasers

Thomas M. Spinka and Constantin Haefner

Recent advances in the average-power capabilities of lasers with petawatt peak powers are enabling new science and applications in industry, biomedicine and security. Continue Reading


 

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IMAGE OF THE WEEK

Coke, Light, Caustics, and a Pokemon Face?
Coke, Light, Caustics, and a Pokemon Face?
When a nearly empty plastic bottle of Coca-Cola is illuminated from above, the freeform lens that's created focuses light, forming fanciful caustics. A four-light lamp in the ceiling projected the pattern projected onto a white sheet of paper, and the pattern was shot using an iPhone. Do you see the face?

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