Efficient sorting of orbital angular momentum states of light

Efficient sorting of orbital angular momentum states of light

2010 | Berkhout, G.C.G.; Lavery, L.A.; Courtial, J.; Beijersbergen, M.W.; Padgett, M.J.
The authors present a method to efficiently sort orbital angular momentum (OAM) states of light using two static optical elements. These elements perform a Cartesian to log-polar coordinate transformation, converting helically phased light beams into beams with a transverse phase gradient. A subsequent lens focuses each OAM state to a different lateral position. The concept is demonstrated experimentally using two spatial light modulators (SLMs) to create the desired optical elements, successfully separating eleven OAM states. The system's channel capacity, a measure of information transmission, is analyzed, and potential improvements, such as adding a binary phase grating, are discussed. The method opens avenues for applications in multiport quantum entanglement, astrophysics, and microscopy.The authors present a method to efficiently sort orbital angular momentum (OAM) states of light using two static optical elements. These elements perform a Cartesian to log-polar coordinate transformation, converting helically phased light beams into beams with a transverse phase gradient. A subsequent lens focuses each OAM state to a different lateral position. The concept is demonstrated experimentally using two spatial light modulators (SLMs) to create the desired optical elements, successfully separating eleven OAM states. The system's channel capacity, a measure of information transmission, is analyzed, and potential improvements, such as adding a binary phase grating, are discussed. The method opens avenues for applications in multiport quantum entanglement, astrophysics, and microscopy.
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