The University of Southampton
University of Southampton Institutional Repository

Optical signal processing using photorefractive crystals

Optical signal processing using photorefractive crystals
Optical signal processing using photorefractive crystals
I describe in this thesis various techniques of optical signal processing using photorefractive BSO and BaTiO3 crystals. Operations of contrast manipulation, motion detection and parallel optical logic operations are demonstrated. Dynamic instabilities have also been investigated in photorefractive BaTiO3, in the mutually pumped geometry.

Contrast manipulation of optical images has been performed via degenerate four wave mixing in BSO and BaTiO3 crystals. In BSO the technique adopted has the apparent drawback of intensity reduction, due to low reflectivities achieved, while using BaTiO3, selective enhancement is achieved for specific Fourier components. An improved versatile technique of polarization encoding of the object Fourier transform has also been implemented with, and without the inclusion of photorefractive crystals. Applications of this technique for phase contrast imaging, and observation in the field of aerodynamics, and Fourier transform synthesis, has been proposed and demonstrated.

Optical motion detection using the differential response time of multiplexed gratings in photorefractive BSO has been demonstrated. The operation of velocity filtering has also been demonstrated using complementary gratings in a BSO crystal, in which specific features are only detected at particular speeds. All sixteen basic parallel optical logic operations have been demonstrated using polarization encoding in a phase conjugate Michelson interferometer with a crystal of BSO as a phase conjugate mirror. Finally dynamic instabilities in BaTiO3 in the 'Bird-wing' mutually-pumped configuration have also been investigated, and a phenomenological model is developed.

Additionally various improvements and refinements have been proposed which will make these techniques more flexible and versatile.
Hussein, Ghazanfar
e5bbacca-a016-469b-a13f-d752cec6545a
Hussein, Ghazanfar
e5bbacca-a016-469b-a13f-d752cec6545a
Eason, Robert
e38684c3-d18c-41b9-a4aa-def67283b020

Hussein, Ghazanfar (1992) Optical signal processing using photorefractive crystals. University of Southampton, Optoelectronics Research Centre, Doctoral Thesis, 302pp.

Record type: Thesis (Doctoral)

Abstract

I describe in this thesis various techniques of optical signal processing using photorefractive BSO and BaTiO3 crystals. Operations of contrast manipulation, motion detection and parallel optical logic operations are demonstrated. Dynamic instabilities have also been investigated in photorefractive BaTiO3, in the mutually pumped geometry.

Contrast manipulation of optical images has been performed via degenerate four wave mixing in BSO and BaTiO3 crystals. In BSO the technique adopted has the apparent drawback of intensity reduction, due to low reflectivities achieved, while using BaTiO3, selective enhancement is achieved for specific Fourier components. An improved versatile technique of polarization encoding of the object Fourier transform has also been implemented with, and without the inclusion of photorefractive crystals. Applications of this technique for phase contrast imaging, and observation in the field of aerodynamics, and Fourier transform synthesis, has been proposed and demonstrated.

Optical motion detection using the differential response time of multiplexed gratings in photorefractive BSO has been demonstrated. The operation of velocity filtering has also been demonstrated using complementary gratings in a BSO crystal, in which specific features are only detected at particular speeds. All sixteen basic parallel optical logic operations have been demonstrated using polarization encoding in a phase conjugate Michelson interferometer with a crystal of BSO as a phase conjugate mirror. Finally dynamic instabilities in BaTiO3 in the 'Bird-wing' mutually-pumped configuration have also been investigated, and a phenomenological model is developed.

Additionally various improvements and refinements have been proposed which will make these techniques more flexible and versatile.

PDF
Hussain_1992_thesis_1540T.pdf - Other
Restricted to Repository staff only

More information

Published date: August 1992
Organisations: University of Southampton

Identifiers

Local EPrints ID: 396383
URI: https://eprints.soton.ac.uk/id/eprint/396383
PURE UUID: aa674be4-72c3-4f45-859b-2c014ced9c6e
ORCID for Robert Eason: ORCID iD orcid.org/0000-0001-9704-2204

Catalogue record

Date deposited: 28 Jun 2016 17:19
Last modified: 06 Jun 2018 13:13

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×