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Spatial subharmonics in photorefractive Bi12SiO20 crystal with a square wave applied field

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4 Author(s)
Kwak, C.H. ; Holography Group, Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ United Kingdom ; Shamonin, M. ; Takacs, J. ; Solymar, L.

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The instability leading to the appearance of subharmonics in the presence of a square wave applied field is investigated both theoretically and experimentally. The threshold conditions are found for a range of parameters and the temporal variation of the subharmonic amplitude is measured. It is shown that a relatively simple theory, based on a set of material equations, gives good agreement with some of the experimental results but other experiments indicate that the materials equations alone cannot describe all the observations.

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Applied Physics Letters  (Volume:62 ,  Issue: 4 )