J. Phys. III France
Volume 4, Numéro 12, December 1994
Page(s) 2459 - 2469
DOI: 10.1051/jp3:1994291
J. Phys. III France 4 (1994) 2459-2469

Weakly multimode dynamics of a photorefractive oscillator

D. Hennequin, L. Dambly, D. Dangoisse and P. Glorieux

Laboratoire de Spectroscopie Hertzienne, Unité associée au Centre National de la Recherche Scientifique, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq Cedex, France

(Received 27 January 1994, accepted 2 May 1994)

The dynamics of a photorefractive oscillator has been studied in the weakly multimode case. It is shown that the eigenmodes of the empty cavity provide the bases in which the transverse patterns of this oscillator should be analysed. The concept of mode families i.e. sets of frequency degenerate modes, is very efficient to classify the different ranges of operation of the oscillator with Fresnel number up to 5-7. As the complexity of the patterns increases, the interpretation in terms of optical defects or phase singularities greatly simplifies the analysis.

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