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

Blog Article

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 Chase Rack 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 average crosstalk Throw of −21.

3 dB, which is mainly limited by the purity of the input states and optical alignment.