Dual-chirality bidirectional structured beams via propagating-discriminative holographic cavity

Digital lasers have become a mature and robust platform for generating customized intracavity modes. However, conventional laser cavities still face challenges in independently controlling two counterpropagating beams with distinct chiralities and tailored profiles. Here, we demonstrate a bidirectional propagation-discriminative cavity (Pro-Discrim cavity) enabled by cascaded computer-generated phase holograms. Using dual-end optimization based on parallel error backpropagation, we realize a pair of coaxial dual-chiral beams that coexist along the clockwise (CW) and counterclockwise (CCW) directions of the cavity and are independently emitted through a polarization-dependent output coupler. The generated double-ring beams exhibit intrinsic separation of dual chiralities, mutual coherence, and a unique unstable Taichi-like evolution in free space. We further extend this propagation-discriminative mechanism to bidirectional intensity distributions, experimentally demonstrating in-dependent control of the output profiles in the CW and CCW directions. This approach provides a versatile platform for applications in high-dimensional optical communication and chiral light–matter interactions.