Rotational Doppler shift spotted in twisted light

Issued: Thu, 24 Oct 2013 13:33:00 BST

"Twisted light" has been used by researchers in the UK to develop a new way of measuring the angular velocity of a remote spinning object. The team fired two beams of light carrying orbital angular momentum at a rotating surface and showed that the resulting interference pattern in the reflected light is related to the surface's angular velocity. The researchers hope that the phenomenon can be used to develop systems to carry out a range of practical measurements, from monitoring industrial equipment to calculating rotation rates of astronomical objects.


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