Researchers find way to measure speed of spinning object using light's orbital angular momentum

(Phys.org) —Researchers in Scotland have devised a way to use the Doppler Effect to discern the spin speed of a rotating object where the object is directly facing the light source. In their paper published in the journal Science, the team describes lab experiments they conducted that allowed them to observe a frequency shift proportional to the product of the rotation frequency of an object and the orbital angular momentum of the light.

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