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Multiplexed storage of permanent and real-time holograms in photorefractive BSO

Multiplexed storage of permanent and real-time holograms in photorefractive BSO
Multiplexed storage of permanent and real-time holograms in photorefractive BSO
In this paper we present a technique for storing holograms in crystals of bismuth silicon oxide (BSO) that combines reversible photochromic effects with the more usual real-time photorefractive characteristics. Photochromic effects have been observed before in these sillenite crystals but have generally been considered as a problem rather than as a possible mechanism for holographic storage. As the normal photorefractive (PR) behaviour is unaffected, however, simultaneous spatial multiplexing of both photorefractive (real-time) and photochromic (permanent) holograms is possible in the same crystal volume.

We have demonstrated a number of applications here ranging from image synthesis to holographic interferometry. These operations are mostly based on the inherently separate nature of these two holographic gratings which can lead to relative phase shifts between the two simultaneously scattered fields by shifting the real-time grating with respect to the permanent one, using optical techniques. Furthermore, the permanent holograms also show unexpected dynamic behaviour in which a fast increase in diffraction efficiency is observed upon illumination by a beam at the highly absorbed blue wavelengths. This effect can be used for all-optical switching.
Clapham, S.L.
d85f047b-54e1-4686-977e-3b75b23eb9c0
Eason, R.W.
e38684c3-d18c-41b9-a4aa-def67283b020
Vainos, N.A.
e4f22637-2f1c-4dec-af67-d059261dd5b2
Clapham, S.L.
d85f047b-54e1-4686-977e-3b75b23eb9c0
Eason, R.W.
e38684c3-d18c-41b9-a4aa-def67283b020
Vainos, N.A.
e4f22637-2f1c-4dec-af67-d059261dd5b2

Clapham, S.L., Eason, R.W. and Vainos, N.A. (1988) Multiplexed storage of permanent and real-time holograms in photorefractive BSO. IEE Colloquium on Optics in Computing, United Kingdom. 17 Nov 1988. 4 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

In this paper we present a technique for storing holograms in crystals of bismuth silicon oxide (BSO) that combines reversible photochromic effects with the more usual real-time photorefractive characteristics. Photochromic effects have been observed before in these sillenite crystals but have generally been considered as a problem rather than as a possible mechanism for holographic storage. As the normal photorefractive (PR) behaviour is unaffected, however, simultaneous spatial multiplexing of both photorefractive (real-time) and photochromic (permanent) holograms is possible in the same crystal volume.

We have demonstrated a number of applications here ranging from image synthesis to holographic interferometry. These operations are mostly based on the inherently separate nature of these two holographic gratings which can lead to relative phase shifts between the two simultaneously scattered fields by shifting the real-time grating with respect to the permanent one, using optical techniques. Furthermore, the permanent holograms also show unexpected dynamic behaviour in which a fast increase in diffraction efficiency is observed upon illumination by a beam at the highly absorbed blue wavelengths. This effect can be used for all-optical switching.

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Published date: 17 November 1988
Venue - Dates: IEE Colloquium on Optics in Computing, United Kingdom, 1988-11-17 - 1988-11-17

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Local EPrints ID: 435076
URI: http://eprints.soton.ac.uk/id/eprint/435076
PURE UUID: 82d0c99d-a6b8-4ea1-8170-134cfbbf97b2
ORCID for R.W. Eason: ORCID iD orcid.org/0000-0001-9704-2204

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Date deposited: 22 Oct 2019 16:30
Last modified: 18 Feb 2021 16:36

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Contributors

Author: S.L. Clapham
Author: R.W. Eason ORCID iD
Author: N.A. Vainos

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