Polarized beam steering by use of multiply-cascaded rotating polarization gratings with biaxial anisotropy

In this presentation, we propose a scheme for a polarized beam steering system using multiply-cascaded rotating PGs with biaxial anisotropy. Our scheme can steer the polarized beam along both a Lissajous orbit and raster orbit, depending on the synchronization of the rotation frequencies of the PGs. Also, the use of more than two PGs allows us to control the center position of the Lissajous orbit. In addition, by using biaxial anisotropy, the diffraction efficiency and the ellipticity of the steered beam remain almost unchanged during PG rotation. Our beam steering system will apply to LiDAR and laser display.