Johansen, P.M. and Pedersen, H.C. and Podivilov, E.V. and Sturman, B.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-Optical Physics, 16 (1). pp. 103-110. ISSN 0740-3224.
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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.
|Divisions:||Faculties > Science Technology and Medical Studies > School of Physical Sciences > Optics
Faculties > Science Technology and Medical Studies > School of Physical Sciences
|Depositing User:||I.T. Ekpo|
|Date Deposited:||12 Sep 2009 18:09|
|Last Modified:||12 Sep 2009 18:09|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/16873 (The current URI for this page, for reference purposes)|
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