ES383910A1 - Improvements introduced in an apparatus that includes a visual means to reproduce a phase hologram. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Improvements introduced in an apparatus that includes a visual means to reproduce a staged phase hologram on a recording medium illuminating the surface of the hologram with an optical energy reading beam of a determined wavelength that impinges on the surface of the hologram to that angle of incidence determined with respect to the visual means of result that a reconstructed image of the hologram is placed in a fixed area of the visual medium when the surface of the hologram has a predetermined orientation with respect to it, and wherein the medium is subject to a type of movement with respect to the predetermined orientation that results in the angle of incidence of the reading beam impinges on the phase hologram that varies from a certain angle, causing in this way the position of the reconstructed image to move from the fixed area ; whose improvements comprise means for orienting the reading beam, the surface of the hologram and the visual medium one with respect to the other to provide that unique value for said determined angle which results in a minimum movement of the reconstituted image with respect to any variation determined from the angle of incidence due to said type of movement of the medium with respect to the predetermined orientation, the single value being that which provides an amount of change increases in the angle of the first-order diffraction of the reading beam with respect to the surface of the phase hologram in response to an incremental change in the angle of incidence of the read beam with respect to the surface of the phase hologram that is substantially equal and opposite to the amount of the incremental change mentioned above. (Machine-translation by Google Translate, not legally binding)