Observation of speckle instability in Kerr random media

S. Residori; U. Bortolozzo; P. Sebbah

doi:10.1117/12.909226

10 February 2012 Observation of speckle instability in Kerr random media

S. Residori, U. Bortolozzo, P. Sebbah

Proceedings Volume 8274, Complex Light and Optical Forces VI; 827412 (2012) https://doi.org/10.1117/12.909226
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

The first experimental evidence of speckle instability is realized by using a liquid crystal cell with a photosensitive wall. The light is transversally scattered in the liquid crystal cell, where a two-dimensional controlled disorder is imprinted through suitable illuminations of the photoconductive wall and the nonlinearity is obtained through optical reorientation of the liquid crystal molecules. Above a critical threshold of the input intensity, the speckle pattern starts spontaneously to oscillate with a characteristic frequency related to the response time of the nonlinear medium. Moreover, the oscillation threshold depends on the scattering mean free path, thus, confirming the crucial role played by disorder in inducing the instability.

Citation Download Citation

S. Residori, U. Bortolozzo, and P. Sebbah "Observation of speckle instability in Kerr random media", Proc. SPIE 8274, Complex Light and Optical Forces VI, 827412 (10 February 2012); https://doi.org/10.1117/12.909226

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