Reference beam absorbers-blockers

Details Reference beam absorbers-blockers Reference beam absorbers-blockers

2005-05-17

2005-05-17

Nguyen, Thong (Department: 2872)

Optical: systems and elements

Holographic system or element

Having multiple object beam or diffuse object illumination

C359S030000, C359S001000, C359S035000

Reexamination Certificate

active

06894815

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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