Browse Prior Art Database

Single Pass Reference Beam for T.I.R. Holography

IP.com Disclosure Number: IPCOM000074301D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Ogden, GD: AUTHOR [+3]

Abstract

The extension of a totally internally reflecting medium around the photosensitive emulsion and addition of a reflective surface enable hologram construction with a single pass of the reference beam through the emulsion in a T.l.R. system. A transparent substrate 1, having photosensitive emulsion 2 thereon, is supported on glass prism 3. The prism, with a reflective coating 4 adjacent the substrate is covered with glass sheet 5 equal in thickness to the substrate and emulsion. A second glass sheet 6 covers sheet 5 and emulsion 2. Glass sheets 5 and 6 preferably have an index of refraction matching the prism and an index-matching liquid is used at the adjacent surfaces. A diffusion screen 7 and object transparency 8 are supported over sheet 6 and emulsion 2.

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Single Pass Reference Beam for T.I.R. Holography

The extension of a totally internally reflecting medium around the photosensitive emulsion and addition of a reflective surface enable hologram construction with a single pass of the reference beam through the emulsion in a T.l.R. system. A transparent substrate 1, having photosensitive emulsion 2 thereon, is supported on glass prism 3. The prism, with a reflective coating 4 adjacent the substrate is covered with glass sheet 5 equal in thickness to the substrate and emulsion. A second glass sheet 6 covers sheet 5 and emulsion 2. Glass sheets 5 and 6 preferably have an index of refraction matching the prism and an index-matching liquid is used at the adjacent surfaces. A diffusion screen 7 and object transparency 8 are supported over sheet 6 and emulsion 2.

For hologram construction, object beam 9 is directed through diffuser 7 and transparency 8 onto emulsion 2. Reference beam 10, coherent with beam 9 enters prism 3, passes through sheets 5 and 6, and is reflected at surface 11 by total internal reflection and at coating 4 to impinge on emulsion 2 from the same side as the object beam. The reference beam thus passes through emulsion 2 only once. For image reconstruction, the developed hologram is placed at the position of emulsion and the reference beam directed at surface 12. With diffuser 7 and object 8 removed, the image will appear at the original object location.

The technique is easily extended to cover large...