Spatial mapping of orbital angular momentum beams based on multiplane light conversion

Here, we introduce a novel approach using a Multiphase Plane Light Conversion (MPLC)-based spatial position mapper for Orbital Angular Momentum (OAM) beams, which enables the transition between longitudinal and transverse spatial domains. By designing and simulating a method with five phase planes, we successfully transform OAM beams across spatial domains from -4th to +4th order. Our method facilitates forward spatial mapping from coaxial input modes along the Z-axis to multiple independent output modes along the y=x direction, and vice versa, enables reverse spatial mapping from the y=x direction back to the Z-axis. Simulation results highlight exceptional performance in OAM beam transformation, with low insertion loss and minimal mode-dependent loss. This compact and efficient configuration shows significant potential for optical communications, super-resolution imaging, and optical computing applications.