Holograms in photorefractive materials

Details Holograms in photorefractive materials Holograms in photorefractive materials

1987-11-23

1989-02-28

Corbin, John K.

350320, G03H 102, G03H 104

Patent

active

048079707

ABSTRACT:
The holographic diffraction efficiencies of photorefractive or electro-optic crystals, such as bismuth silicon oxide (BSO), increase while experiencing high AC voltages. The diffraction efficiency also increases with frequency of the AC voltages up to a saturation frequency. These enhancements are attributed to the response times of the crystal and the superposition of internal electric fields. The enhanced diffraction efficiency assists in retentively recording information bearing holograms in electro-optic crystalline media.

REFERENCES:
patent: 4674824 (1987-06-01), Goodman et al.
Peltier et al, "Volume Hologram Recording and Charge Transfer Process in Bi.sub.12 SiO.sub.20 and Bi.sub.12 GeO.sub.20 ", Journal of Applied Physics, vol. 48, No. 9, Sep. 1977, pp. 3683-3690.
Huignard et al, "Wave Mixing in Photorefractive Bismuth Silicon Oxide Crystals and its Applications", Optical Engineering, vol. 24, No. 4, Jul./Aug. 1985, pp. 586-592.
Stepanov et al, "Efficient Degenerate Four-Wave Mixing in a Photorefractive Cubic Bi.sub.12 TiO.sub.20 Crystal", Sov. Phys. Tech. Phys., vol. 29, No. 6, Jun. 1984, pp. 703-705.
Stepanov et al, "Efficient Unstationary Holographic Recording in Photorefractive Crystals under an External Alternating Electric Field", Optics Communications, vol. 53, No. 5, Apr. 1, 1985, pp. 292-295.
A. Marrakchi et al, "Application of Phase Conjugation in Bi.sub.12 SiO.sub.20 Crystals to Mode Pattern Visualization of Diffuse Vibrating Structures", Optics Communications, vol. 34, No. 1, Jul. 1980, pp. 15-18.
J. P. Huignard et al, "Time Average Holographic Interferometry with Photoconductive Electrooptic Bi.sub.2 SiO.sub.20 Crystals", Applied Optics, vol. 16, No. 11, Nov. 1977, pp. 2796-2798.
H. M. Smith, Holographic Recording Materials, Springer-Verlag, vol. 20, 1977, pp. 101-132, Chapter 4 by D. L. Staebler.

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