Reference beam absorbers-blockers
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United States of America Patent
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May 17, 2005
Grant Date -
N/A
app pub date -
May 24, 2002
filing date -
May 25, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In accordance with teachings of the present invention, a device accomplishes the task of reducing or preventing reflections of the reference beam off a diffuser from striking the holographic recording material. First, the device absorbs a large percentage of the reference beam power so that portion of the reference beam never reaches the diffuser. Second, the device blocks the small amount of reference beam that is incident on the diffuser and reflects back toward the film. Thus, the proposed device operates as an absorber-blocker (AB) for the reference beam.
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