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Replying to @DanielleFong
They just found a way to make the higher-order group velocity remain constant, not the light itself.pic.twitter.com/SJYbO3VxUx
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Replying to @DanielleFong @__ice9
so, i'm imagining that femtosecond video of a lightpulse -- you remember that one?
they're saying they control the speed of the wave packet, not the "underlying oscillations of the light wave" but, you would see no slowdown & diff refraction in the coke bottle

2:37 PM - 6 Aug 2020
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