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Two-wave mixing in photorefractive SBN planar waveguides

Robertson, E.E., Eason, R.W., Kaczmarek, M., Chandler, P.J. and Huang, X. (1995) Two-wave mixing in photorefractive SBN planar waveguides At 12th UK National Quantum Electronics Conference (QE12), United Kingdom. 04 - 08 Sep 1995.

Record type: Conference or Workshop Item (Paper)


Planar waveguides have been fabricated in SBN:61 and SBN:75 by ion-beam implantation. The implantation was carried out using 2.0MeV H+ ions with doses ranging from 2x10 for the TE mode. These losses are significantly lower than those observed for planar waveguides fabricated previously using sulphur diffusion [1]. Two beam coupling experiments were then carried out on the SBN waveguide where it was observed that the gain direction was the same as that of the bulk crystal. Previously, in both BaTiO3 [2] and KNbO3 [3] planar waveguides fabricated in the same manner, the gain direction for two beam coupling had been shown to reverse. This phenomenon may be due to the ion beam implantation process reducing the waveguide layer and subsequently changing the ratio of impurity atom oxidation states - in the case of BaTiO3, the ratio of Fe2+:Fe3+. It is thought that the predominant photoexcited charge carrier in both BaTiO3 and KNbO3 is changed from the hole to the electron whereas in SBN, the electron remains the predominant carrier even after the implantation process. Modelling of these effects has been undertaken, giving an explanation of why gain reversal should occur in certain photorefractive planar waveguides fabricated by ion-beam implantation.
This paper will discuss the gain and response time of the SBN waveguide in comparison to the bulk and the theoretical predictions of the effects of ion-beam implantation on photorefractive materials

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Published date: 1995
Venue - Dates: 12th UK National Quantum Electronics Conference (QE12), United Kingdom, 1995-09-04 - 1995-09-08


Local EPrints ID: 77070
PURE UUID: 6eef60d8-7fd3-45d2-85ab-2209a79f778a
ORCID for R.W. Eason: ORCID iD

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:34

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Author: E.E. Robertson
Author: R.W. Eason ORCID iD
Author: M. Kaczmarek
Author: P.J. Chandler
Author: X. Huang

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