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Phys. Rev. Lett. 108, 033901 (2012) [4 pages]

Beam Instabilities in the Scale-Free Regime

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V. Folli1,2, E. DelRe2, and C. Conti1,2,3
1Institute for Complex Systems–CNR, Department of Physics, University Sapienza, Piazzale Aldo Moro 2, 00185 Rome, Italy
2Department of Physics, University Sapienza, Piazzale Aldo Moro 2, 00185 Rome, Italy
3Department of Molecular Medicine, University Sapienza, Viale Regina Elena 324, 00161 Rome, Italy

Received 16 July 2011; published 18 January 2012

The instabilities arising in a one-dimensional beam sustained by the diffusive photorefractive nonlinearity in out-of-equilibrium ferroelectrics are theoretically and numerically investigated. In the “scale-free model,” in striking contrast with the well-known spatial modulational instability, two different beam instabilities dominate: a defocusing and a fragmenting process. Both are independent of the beam power and are not associated with any specific periodic pattern.

© 2012 American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.108.033901
DOI:
10.1103/PhysRevLett.108.033901
PACS:
42.65.Tg, 05.45.Yv, 42.65.Hw, 42.65.Jx
 
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