APPARATUS FOR COPYING A HOLOGRAM
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United States of America Patent
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Issued Date -
Jun 25, 2015
app pub date -
Jun 17, 2013
filing date -
Jun 18, 2012
priority date (Note) -
Abandoned
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Abstract
A holographic recording apparatus having a source of illumination, a master hologram containing at least one hologram lamina overlaying, a copy substrate containing a holographic recording medium, and a voltage generator for applied a voltage across at least one of the master hologram and the copy substrate. The master hologram diffracts the illumination light into zero order light and diffracted light which interfere in the copy substrate to form a copy of the master hologram. The source of illumination is applied for a predefined exposure time during which the voltage varies the refractive index modulation of at least one of the master hologram and the copy hologram.
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