Grazing incidence holograms and system and method for producing the same
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United States of America Patent
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Oct 13, 1998
Issued Date -
N/A
app pub date -
Jan 31, 1996
filing date -
Jan 29, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and system for recording and displaying grazing-incidence (i.e., steep reference beam angle) holograms supported on a substrate having thin edge-illuminatable geometry. The system and process of the present invention uses thin edge-illuminated substrates that facilitate optimal coupling of the reference light beam at steep angles approaching grazing incidence, while maximizing the contrast of the slanted fringe structures thereof. A recording medium is in direct contact with a thin substrate whose refractive index is greater than the bulk refractive index of the recording medium. At the substrate interface, the recording medium has a gradient-type index matching region, created by exposure of the recording medium to reference beam illumination, prior to the further application of an object beam to create a fringe pattern.
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