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The problem of achieving high second-order nonlinearities in glasses: The role of electric conductivity in poling of high index glasses

The problem of achieving high second-order nonlinearities in glasses: The role of electric conductivity in poling of high index glasses
The problem of achieving high second-order nonlinearities in glasses: The role of electric conductivity in poling of high index glasses
Efficient thermal poling of electronically conducting glass is prevented by the inherent difficulty to record a large electrostatic field within such glasses. To overcome this limitation, a waveguide/substrate configuration has been proposed, in which the glass for poling was deposited as a film of appropriate thickness on a substrate chosen for its higher ionic conductivity. Owing to this configuration, the poling voltage drops entirely across the glass film, allowing high electrostatic field to be recorded in spite of the high electronic conductivity of the glass. The proposed method was demonstrated here in the case of bismuth-zinc-borate glasses, which possess high potential for poling because of their high intrinsic chi(3). A four-fold enhancement of chi(2) compared to bulk glass, from ~ 0.5 to ~ 2 pm/V, is demonstrated. It is also shown that the chi(2) values obtained are the highest sustainable by the glass limited by the onset of nonlinear conductivity. The waveguide/substrate configuration intrinsically allows obtaining perfect overlap of the poling induced second-order nonlinearity with the guiding region of the waveguide. An equivalent RC-circuit model describing the poled glass reveals that the value of the poling-induced second-order nonlinearity is strongly dependent on the ratio beta between ionic and electronic conductivity. The most promising glass systems for poling are found to be the ones displaying the highest product chi(3).beta. This work is performed on bismuth-zinc-borate heavy metal oxide glasses but the waveguide/substrate configuration proposed here is likely to be equally successful in enhancing the second-order nonlinearity in high chi(3) electronic conducting glasses such as for example telluride and chalcogenide glasses.
high fields effects h150, electronic conductivity e240, second harmonic generation s117, optical waveguides o120
0022-3093
2742-2749
Corbari, C.
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Ajitdoss, L.C.
ee7b7375-2b3c-48ad-85b8-f4e8843ac21b
Carvalho, I.C.S.
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Deparis, O.
6bb2a112-4df2-4902-9645-dd3af9a8cedd
Mezzapesa, F.P.
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Kazansky, P.G.
a5d123ec-8ea8-408c-8963-4a6d921fd76c
Sakaguchi, K.
1604d295-67e7-45ed-866c-fee8d1d63c3f
Corbari, C.
0d97e1c1-7a62-47c6-8f97-735f7946f93f
Ajitdoss, L.C.
ee7b7375-2b3c-48ad-85b8-f4e8843ac21b
Carvalho, I.C.S.
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Deparis, O.
6bb2a112-4df2-4902-9645-dd3af9a8cedd
Mezzapesa, F.P.
1fe96dc4-7d66-4a06-aa18-9ab5de416b5f
Kazansky, P.G.
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Sakaguchi, K.
1604d295-67e7-45ed-866c-fee8d1d63c3f

Corbari, C., Ajitdoss, L.C., Carvalho, I.C.S., Deparis, O., Mezzapesa, F.P., Kazansky, P.G. and Sakaguchi, K. (2010) The problem of achieving high second-order nonlinearities in glasses: The role of electric conductivity in poling of high index glasses. Journal of Non-Crystalline Solids, 356 (50-51), 2742-2749. (doi:10.1016/j.jnoncrysol.2010.09.033).

Record type: Article

Abstract

Efficient thermal poling of electronically conducting glass is prevented by the inherent difficulty to record a large electrostatic field within such glasses. To overcome this limitation, a waveguide/substrate configuration has been proposed, in which the glass for poling was deposited as a film of appropriate thickness on a substrate chosen for its higher ionic conductivity. Owing to this configuration, the poling voltage drops entirely across the glass film, allowing high electrostatic field to be recorded in spite of the high electronic conductivity of the glass. The proposed method was demonstrated here in the case of bismuth-zinc-borate glasses, which possess high potential for poling because of their high intrinsic chi(3). A four-fold enhancement of chi(2) compared to bulk glass, from ~ 0.5 to ~ 2 pm/V, is demonstrated. It is also shown that the chi(2) values obtained are the highest sustainable by the glass limited by the onset of nonlinear conductivity. The waveguide/substrate configuration intrinsically allows obtaining perfect overlap of the poling induced second-order nonlinearity with the guiding region of the waveguide. An equivalent RC-circuit model describing the poled glass reveals that the value of the poling-induced second-order nonlinearity is strongly dependent on the ratio beta between ionic and electronic conductivity. The most promising glass systems for poling are found to be the ones displaying the highest product chi(3).beta. This work is performed on bismuth-zinc-borate heavy metal oxide glasses but the waveguide/substrate configuration proposed here is likely to be equally successful in enhancing the second-order nonlinearity in high chi(3) electronic conducting glasses such as for example telluride and chalcogenide glasses.

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Published date: November 2010
Keywords: high fields effects h150, electronic conductivity e240, second harmonic generation s117, optical waveguides o120
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 176769
URI: https://eprints.soton.ac.uk/id/eprint/176769
ISSN: 0022-3093
PURE UUID: afb75322-0935-449e-b475-85db24f6d905

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Date deposited: 10 Mar 2011 16:23
Last modified: 19 Jul 2019 23:09

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Contributors

Author: C. Corbari
Author: L.C. Ajitdoss
Author: I.C.S. Carvalho
Author: O. Deparis
Author: F.P. Mezzapesa
Author: P.G. Kazansky
Author: K. Sakaguchi

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