High fidelity detection of the orbital angular momentum of light by time mapping

High fidelity detection of the orbital angular momentum of light by time mapping

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discount greenery We demonstrate high-fidelity detection of the orbital angular momentum (OAM) of light using a compact and practical OAM spectrometer that maps the OAM spectrum to time.The spectrometer consists of a single optical delay loop to achieve timing mapping, a vortex phase plate that iteratively decreases the OAM value and a single mode fiber to distinguish zero from non-zero OAM states.Light with arbitrarily OAM compositions can be measured.For light with OAM up to 4ℏ, we measured an iphone 14 price texas average crosstalk of −21.3 dB, which is mainly limited by the purity of the input states and optical alignment.