Ac square-wave field-induced subharmonics in photorefractive sillenite: threshold for excitation by inclusion of higher harmonics

Johansen, Per M., Pedersen, Henrik C., Podivilov, Evgeny V., Sturman, Boris I. (1999) Ac square-wave field-induced subharmonics in photorefractive sillenite: threshold for excitation by inclusion of higher harmonics. Journal of the Optical Society of America B, 16 (1). pp. 103-110. ISSN 0740-3224. (doi:10.1364/JOSAB.16.000103) (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) (KAR id:16873)

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.
Official URL: http://dx.doi.org/10.1364/JOSAB.16.000103

Abstract

We investigated both analytically and numerically the simultaneous influence of higher-harmonic gratings and subharmonic gratings on the threshold for generation of the subharmonic K/2 grating. The higher-harmonic grating causes feedback to the fundamental grating, thus leading to a nonlinear correction in dissipation, and the threshold for subharmonic generation is substantially modified by the presence of more subharmonics. The numerical solution shows that the inclusion of five higher-harmonic components and four subharmonic components are sufficient to cover the entire spatial region. The discrepancy between the analytical and the numerical solution increases with increased electric-field amplitude.

Item Type:	Article
DOI/Identification number:	10.1364/JOSAB.16.000103
Subjects:	Q Science
Institutional Unit:	Schools > School of Engineering, Mathematics and Physics > Physics and Astronomy
Former Institutional Unit:	Applied Optics Group School of Physical Sciences Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User:	I.T. Ekpo
Date Deposited:	12 Sep 2009 18:09 UTC
Last Modified:	20 May 2025 09:32 UTC
Resource URI:	https://kar.kent.ac.uk/id/eprint/16873 (The current URI for this page, for reference purposes)

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