Optical: systems and elements – Holographic system or element – Having optical element between object and recording medium
Patent
1992-11-05
1994-03-01
Sugarman, Scott J.
Optical: systems and elements
Holographic system or element
Having optical element between object and recording medium
359 1, 359 31, 359 10, 359 28, G03H 100, G03H 102
Patent
active
052913210
ABSTRACT:
A method and an apparatus for making a hologram wherein interference patterns to be recorded on a hologram plate are prevented from travelling, thereby enabling a high quality hologram to be made. The method comprises the steps of forming a monitoring hologram on a portion of the hologram plate, producing a monitoring beam based on a laser beam, splitting the laser and monitoring beams into two beams, respectively, producing object, reference, monitoring object and monitoring reference beams, allowing the monitoring object and reference beams to be incident on the monitoring hologram to form monitoring interference patterns, sensing an intensity of the monitoring interference patterns, comparing the sensed intensity with a reference intensity, if the intensity is varied exceeding a tolerance limit of the intensity variation, blocking the laser beam and allowing the monitoring object beam and the monitoring reference beam to be incident on the monitoring hologram, if not so, allowing the object beam and the reference beam to be incident on the hologram plate, and performing repeatedly the sensing and comparing steps so that the object beam and the reference beam are incident on the hologram plate only for a predetermined time period to record the hologram based on an interference phenomenon thereof.
REFERENCES:
Definsive publication Lanteigne, application Ser. No. 386,323, filed Jul. 28, 1989, laid open to public inspection on Nov. 6, 1990.
Goldstar Co. Ltd.
Robbins Thomas D.
Sugarman Scott J.
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