Optical activity in photorefractive Bi12TiO20

Shamonina, E. and Kamenov, V.P. and Ringhofer, K.H. and Cedilnik, G. and Kiessling, A. and Kowarschik, R. and Webb, David J. (1998) Optical activity in photorefractive Bi12TiO20. Optics Communications, 146 (1-6). pp. 62-68. ISSN 0030-4018. (doi:https://doi.org/10.1016/S0030-4018(97)00510-5) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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The influence of optical activity on two-wave mixing (TWM) in photorefractive BTO and BSO crystals in the absence of an applied field is studied both theoretically and experimentally. For the conventinal orientations of the grating vector, K parallel to [001] and K perpendicular to [001], the piezoelectric and photoelastic effects are either zero or negligible. This makes an analytical treatment of the TWM problem possible. We obtain an analytical solution for the coupled wave equations of TWM valid for arbitrary optical activity. This result is of special importance for BTO crystals. In these crystals under the condition of maximum energy transfer (\K\r(D) = 1, where r(D) is the Debye radius) neither the approximation of small optical activity nor the one of dominating optical activity is applicable and our analytical solution becomes essential. Our experimental setup uses beams with a trapezoidal overlap that allow us to study the thickness-dependence of the gain in a single measurement. Experimental and theoretical results for a BTO crystal are compared with those for a BSO crystal and are explained in the framework of the model used.

Item Type: Article
Uncontrolled keywords: sillenites; photorefractive; two-wave mixing; optical activity
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunications > TK5103.59 Optical communications, Fibre-optics
Divisions: Faculties > Sciences > School of Physical Sciences > Applied Optics Group
Faculties > Sciences > School of Physical Sciences
Depositing User: Tara Puri
Date Deposited: 03 Jul 2009 14:12 UTC
Last Modified: 01 May 2014 13:15 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/17123 (The current URI for this page, for reference purposes)
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