By Prof. Dr. Cornelia Denz, Dr. Michael Schwab, Dr. Carsten Weilnau (auth.)
The ebook provides an summary of tangible advancements in nonlinear photorefractive optics and is meant for scientists operating within the box of optics or nonlinear physics. it's intended as an creation to genuine intriguing discoveries during this quarter, with particular emphasize on transverse results corresponding to spatial soliton formation and interplay, spontaneous development formation, and trend festival in lively suggestions platforms. In some of these components, diversified facets of capability purposes, resembling wave guiding in adaptive photorefractive solitons and methods for trend regulate for info processing, are defined. Experimental realizations reveal the diversity of photorefractive styles, and various two-dimensional simulations turn out the experimental observations.
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Extra resources for Transverse-Pattern Formation in Photorefractive Optics
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Rev. 175, 256 (1968). 26 25. N. V. Sheinina, On the theory of interaction of counterpropagating waves in a nonlinear cubic medium, Radiophys. Quantum Electron. 27, 15 (1983). 26 26. M. Karlson, Optical beams in saturable self-focusing media, Phys. Rev. A 46, 2726 (1992). 26 References 47 27. H. L. Dawes, Dynamic formation of a small-scale filament, Phys. Rev. Lett. 21, 556 (1968). 26, 38 28. L. H. Marburger, Computer studies of self-focusing, Phys. Rev. 179, 862 (1969). 26 29. V. Konno and H. Suzuki, Self-focusing of laser beam in nonlinear media, Phys.
Cryst. Liq. Cryst. 207, 219 (1991). 44 58. A. Schreiber, Experimental investigation of solitary structures in a nonlinear optical feedback system, Opt. Commun. 136, 415 (1997). 44 59. B. Sch¨ apers, M. Feldmann, T. Ackemann and W. Lange, Interaction of localized structures in an optical pattern-forming system, Phys. Rev. Lett. 85, 748 (2000). 44 3 The Photorefractive Nonlinearity The photorefractive effect – representing a photoinduced change of the index of refraction via the electro-optic effect – has become the nonlinear optical mechanism of choice for optical image processing.
Therefore, it is now subject to a broader class of perturbations. Perturbations that affect the hidden coordinate are of particular importance. The corresponding symmetry-breaking instability, which is due to the growth of the perturbations along the hidden, initially homogeneous coordinate, is called a transverse modulation instability. It characterizes a breakup of the continuous wave (or plane wave) and results in the filamentation of a one-dimensional stripe or two-dimensional beam during propagation, which prevents stable solitary-wave propagation.