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We'd watch color melt into infrared

Chapters 0:00 - All light is basically the same 1:44 - Our slow-mo world 2:38 - Doppler effect 4:38 - How colors distort near ...
American Physical Society

Probing the Rotational Doppler Effect with a Single Ion

A light beam with orbital angular momentum can produce the rotational analog of the Doppler effect on an ion. A vortex light beam is one whose wave fronts rotate like a corkscrew, endowing the beam ...