Method and apparatus for generating optical information

摘要

A method and apparatus for generating optical information are disclosed. A plurality of electrode wires are arranged on an electro-optical crystal, a light beam passing through the electro-optical crystal is spatially phase-modulated by an electro-optical effect due to a voltage applied to the electrode wires, a portion of light distribution spread by diffraction of the phase-modulated light beam is blocked by an optical system having an aperture or a slit arranged on a focal plane of the optical system, and the light passed through the aperture is focused to generate optical information composed of a minimum unit equal to a multiple of a minimum electrode-to-electrode distance.