Grazing incidence holograms and system and method for producing the same
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United States of America Patent
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Nov 21, 2000
Issued Date -
N/A
app pub date -
Jan 16, 1998
filing date -
Jan 29, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and system are disclosed 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 use 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. Different recording techniques are employed when the index of refraction of the substrate is greater than that of the recording medium, than when the index of refraction of the substrate is less than that of the recording medium. A recording and playback system of complementary design is provided for recording slanted-fringe volume holograms under relaxed conditions, without compromising the light diffraction efficiency of the holograms under different playback conditions.
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