×

Method and apparatus for recording and displaying edge-illuminated holograms

  • US 4,643,515 A
  • Filed: 04/01/1985
  • Issued: 02/17/1987
  • Est. Priority Date: 04/01/1985
  • Status: Expired due to Term
First Claim
Patent Images

1. A method for recording a hologram, comprising:

  • placing a recording medium sensitive to electromagnetic energy in proximity to a body refractive of electromagnetic energy, said body having a plurality of surfaces and being adapted to refract electromagnetic energy impinging on at least a first of said plurality of surfaces onto said recording medium, the index of refraction of the body being greater than the index of refraction of the space adjacent said first of said plurality of surfaces;

    filling the space between said recording medium and said refractive body with a layer of material transparent to electromagnetic energy, said material having an index of refraction greater than or equal to the index of refraction of said refractive body;

    forming a plurality of beams from a coherent source of electromagnetic energy;

    creating an object wavefront by illuminating an object to be holographically recorded with a first of said plurality of beams;

    directing a portion of said object wavefront to impinge on said first of said plurality of surfaces, said portion being refracted onto said recording medium;

    creating a reference wavefront within said reflective body by directing a second of said plurality of beams onto a second of said plurality of surfaces;

    exposing said recording medium to the portion of said reference wavefront impinging on said second of said plurality of surfaces and being refracted onto the recording medium, creating an electromagnetic interference pattern between said wavefronts within the recording medium; and

    rendering said interference pattern permanent in said recording medium.

View all claims
  • 6 Assignments
Timeline View
Assignment View
    ×
    ×