Generation and detection of a diffraction-multiplexed spatial correlation vortex array through a scattering medium

We present a compact intensity interferometer designed to synthesize the second-order complex correlation function through intensity correlation measurements. By leveraging the diffraction-multiplexed vortex generation capability of a Dammann vortex grating alongside a holographic intensity correlation technique, our system generates tunable one- and two-dimensional correlation vortex array patterns. This advancement enables applications in optical communication and orbital angular momentum encryption, offering robust stability and propagation adaptability in diverse environments.