Holographic element

Details Holographic element Holographic element

1991-06-20

1992-11-17

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

359 30, 430 2, G03H 104

Patent

active

051648474

ABSTRACT:
A transmission holographic element (30) comprises a holographic material (330) deposited onto a substrate (31) to form a composite substrate structure. The substrate (31) is coated with a mirror coating (32) prior to the deposit of the holographic material (33) which is reflecting at the reading wavelength and non-reflecting at the recording wavelength. This allows the use of substrates that need not be of good optical quality because when the holographic element is exposed to light at the reading wavelength, light is reflected by the mirror coating before passing through the substrate. In addition, the mirror coating is protectred from damage during processing since it is between the substrate (31) and holographic material (33).

REFERENCES:
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patent: 3975082 (1976-08-01), Winzer
patent: 4508420 (1985-04-01), Nishiwaki
Micheron et al., "High Photosensitivity Volume Hologram Recording Bi12SO.sub.20 and B12GeO.sub.20 by Efficient Charge Transfer Process", Optics Communications, Jul. 1976, vol. 18, No. 2, pp. 216 to 217.
Huignard et al., "Coherent Selective Erasure of Superimposed Volume Holograms in LiNbO.sub.3 ", Applied Physics Letters, Mar. 1, 1975, vol. 26, No. 5, pp. 256 to 258.
Herwig Kogelnik, "Coupled Wave Theory for Thick Hologram Gratings", Bell System Technical Journal, Nov. 1969, vol. 48, No. 9, pp. 2909 to 2947.
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