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Enhancement of the photorefractive properties of BSO and BaTiO3

Enhancement of the photorefractive properties of BSO and BaTiO3
Enhancement of the photorefractive properties of BSO and BaTiO3
The fundamental properties of photorefractive crystals have been extensively investigated for nearly the past two decades. Two significant photorefractive crystals that have been the subject of investigation are bismuth silicon oxide (BSO) and barium titanate (BaTiO3).

The aim of this thesis was to find ways to enhance the photorefractive properties of BSO and BaTiO3 to further research into production of a practical phase conjugate device with a high diffraction efficiency, fast response time, operation in the infra-red for laser diode compatibility, stable output and miniaturisation of crystal volume.

A technique to enhance the diffraction efficiency of BSO by a factor x100 has been successfully demonstrated and waveguides have been successfully fabricated in BaTiO3 through H+ implantation. The losses of these waveguides have been minimized by implanting over a range of doses and measuring the observed losses. Both self pumped and mutually pumped phase conjugators have been successfully demonstrated in these BaTiO3 waveguides.

However, the remaining concern is that BaTiO3 crystals in both bulk and waveguide geometries exhibit instabilities which are undesirable for stable phase conjugate output. Much speculation has been given to the nature of the instabilities, but it is shown for the first time, that under certain conditions the phase conjugate output makes a transition from stable to chaotic behaviour. Regions of stable operation have been identified.
Jeffrey, Philip Michael
a915fa7e-968d-4a2b-a61d-bb186d21ad86
Jeffrey, Philip Michael
a915fa7e-968d-4a2b-a61d-bb186d21ad86
Eason, Robert
e38684c3-d18c-41b9-a4aa-def67283b020

Jeffrey, Philip Michael (1994) Enhancement of the photorefractive properties of BSO and BaTiO3. University of Southampton, Faculty of Science, Doctoral Thesis, 264pp.

Record type: Thesis (Doctoral)

Abstract

The fundamental properties of photorefractive crystals have been extensively investigated for nearly the past two decades. Two significant photorefractive crystals that have been the subject of investigation are bismuth silicon oxide (BSO) and barium titanate (BaTiO3).

The aim of this thesis was to find ways to enhance the photorefractive properties of BSO and BaTiO3 to further research into production of a practical phase conjugate device with a high diffraction efficiency, fast response time, operation in the infra-red for laser diode compatibility, stable output and miniaturisation of crystal volume.

A technique to enhance the diffraction efficiency of BSO by a factor x100 has been successfully demonstrated and waveguides have been successfully fabricated in BaTiO3 through H+ implantation. The losses of these waveguides have been minimized by implanting over a range of doses and measuring the observed losses. Both self pumped and mutually pumped phase conjugators have been successfully demonstrated in these BaTiO3 waveguides.

However, the remaining concern is that BaTiO3 crystals in both bulk and waveguide geometries exhibit instabilities which are undesirable for stable phase conjugate output. Much speculation has been given to the nature of the instabilities, but it is shown for the first time, that under certain conditions the phase conjugate output makes a transition from stable to chaotic behaviour. Regions of stable operation have been identified.

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More information

Published date: March 1994
Organisations: University of Southampton

Identifiers

Local EPrints ID: 399145
URI: https://eprints.soton.ac.uk/id/eprint/399145
PURE UUID: f59f8bcd-d13d-4720-825d-88f4ded8f3a5
ORCID for Robert Eason: ORCID iD orcid.org/0000-0001-9704-2204

Catalogue record

Date deposited: 16 Sep 2016 15:36
Last modified: 06 Jun 2018 13:13

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