Fixed three-dimensional holographic images

Clint Wood; Gregory J. Salamo; John Goff; Gary L. Wood; Richard J. Anderson; David J. McGee

doi:10.1364/AO.41.006796

Applied Optics
Vol. 41,
Issue 32,
pp. 6796-6801
(2002)
•https://doi.org/10.1364/AO.41.006796

Fixed three-dimensional holographic images

Clint Wood, Gregory J. Salamo, John Goff, Gary L. Wood, Richard J. Anderson, and David J. McGee

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Clint Wood, Gregory J. Salamo, John Goff, Gary L. Wood, Richard J. Anderson, and David J. McGee, "Fixed three-dimensional holographic images," Appl. Opt. 41, 6796-6801 (2002)

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Abstract

Three-dimensional holograms were recorded in a cerium-doped, strontium barium niobate (SBN:75) photorefractive crystal. These holograms are shown to not degrade after more than one week of continuous readout and to reconstruct reproductions of the original object with an observable field of view of approximately 35°.

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Fixing Procedure
Step	Action			Observation
1. Pole crystal	1. Apply a voltage of +3-kV amplitude for 4 h.			1. All ferroelectric domains are aligned in the direction of the c axis.
2. Depole crystal	2. Apply a pulse of -1.7-kV amplitude and 0.50-s duration.			2. Ferroelectric domains are randomized and beam fanning is minimized.
3. Write 3-D hologram	3. Apply a constant voltage of -1.0 kV and illuminate the crystal for ∼3 min with a reference beam of <5 mW and object beam of <100 mW scattered off of the object.			3. Light scattered from object uniformly illuminates crystal as hologram is written.

Continuous Read			Read, Protect, Reveal
Step	Action	Observation	Step	Action	Observation

1. Read image	1. Remove the constant -1.0-kV voltage and read the crystal with ∼1 mW for ≥10 min.	1. Image viewed over a field of view of ∼35°. Image intensity reduced to a steady-state value (5% of original value) by continuous readout.	1. Read image	1. Remove the constant -1.0-kV voltage and read the crystal with ∼1 mW for ≤1 min.	1. Image decays to a value of approximately 95% of its original intensity.
2. Reveal and read image	2. Apply a pulse of +1.7-kV amplitude and 0.50-s duration and read the crystal with ∼1 mW.	2. Image intensity increases by approximately 1-order of magnitude, but will decay to zero unless a negative voltage pulse is applied.	2. Protect the image	2. Apply a pulse of -1.7-kV amplitude and 0.50-s duration while continuing to read the crystal with ∼1 mW.	2. Image disappears and is protected from decay because of the presence of a read beam.
			3. Reveal and read the protected image	3. Apply a pulse of +1.7-kV amplitude and 0.50-s duration while continuing to read the crystal with ∼1 mW.	3. Image reappears at near 100% its original intensity.

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Applied Optics