We report the first observation of self-modified optical diffraction, beam ellipticity recovery and conservation, and intensity independent self-focusing in an anisotropic diffusion-type nonlinearity realized in ferroelectrics heated above the centrosymmetric transition. The interaction, a photorefractive diffusion-driven quadratic nonlinearity, constitutes the first known natural realization of a higher-order logarithmic nonlinearity and allows an analytical description of the observed phenomena and the prediction of a class of noncircular solitons with no characteristic length scale.
Nonlinear optical diffraction effects and solitons due to anisotropic charge-diffusion based self-interaction / B., Crosignani; A., Degasperis; DEL RE, Eugenio; P., Diporto; A. J., Agranat. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 82:8(1999), pp. 1664-1667. [10.1103/PhysRevLett.82.1664]
Nonlinear optical diffraction effects and solitons due to anisotropic charge-diffusion based self-interaction
DEL RE, EUGENIO;
1999
Abstract
We report the first observation of self-modified optical diffraction, beam ellipticity recovery and conservation, and intensity independent self-focusing in an anisotropic diffusion-type nonlinearity realized in ferroelectrics heated above the centrosymmetric transition. The interaction, a photorefractive diffusion-driven quadratic nonlinearity, constitutes the first known natural realization of a higher-order logarithmic nonlinearity and allows an analytical description of the observed phenomena and the prediction of a class of noncircular solitons with no characteristic length scale.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
