Generation of High-Purity Full Poincar Beam Arrays via Metasurface Integrated Degenerate Cavity

Recently, full Poincar & eacute; beams (FPBs) with spatially variant polarization states spanning the entire surface of the Poincar & eacute; sphere have attracted considerable interests. Expanding the FPBs into an array way has the promising applications from multiparticle manipulation to optical communication. However, how to efficiently generate a high-purity FPB array with intracavity method remains elusive. Here, a metasurface-integrated degenerate cavity laser is proposed for efficient generation of 10 x 10 FPB array, where a pair of metasurfaces are adopted to independently modulate the circular polarization state while compensating the mode discrepancies within the cavity. Such a design strategy enables a self-reproducing intracavity optical field, concurrently ensuring the stabilization of intracavity oscillation. It is numerically demonstrated that the purity of orbital angular momentum (OAM) in the first-order FPB array can approach to 92.89%, with a root-mean-square error (RMSE) of polarization ellipse parameters below 8.17%. This work provides a compact and efficient design platform for the generation of a variety of vector beam arrays and may find promising applications in free space communication and multiple particle manipulation. A metasurface-integrated degenerate cavity laser for the efficient generation of a full Poincar & eacute; beam (FPB) array is achieved, with the mode purity of orbital angular momentum (OAM) up to 92.89%. Dual metasurfaces are integrated for the intracavity asymmetric photonic spin-orbit interaction and mode compensation. Such a design strategy enables a self-reproducing intracavity field, concurrently ensuring the stabilization of intracavity oscillation. image