Novel photorefractive sensing device for laser surface inspection

摘要

We have developed a novel photorefractive sensing device using the hologram storage characteristic of a photorefractive barium titanate crystal. This device is capable of observing surface structures of precisely machined work, and we demonstrated surface sensing and inspection using samples. The angular resolution of this device depended on the angular aperture of the Bragg diffraction of the gratings inside the crystal, and resolution as high as submilliradian is expected.