Recent publication: theoretical and experimental work on nonlinear property of a discrete optical system

The result of the collaboration between CEFOP and Helmut-Schmidt University, Hamburg, Germany, was recently published in Physics Review A, by researchers Diego Guzmán, Uta Naether and Rodrigo Vicencio, from Universidad de Chile, who worked with Cibo Lou, Christian Rüter and Detlef Kip, researchers from the german institution.

Density plot of x out vs |α| and P for γ =10. Solid and dashed white lines correspond to the asymmetric and intermediate solutions, respectively.This is a theoretical and experimental verification of a multistable regime in saturable nonlinear coupler (. Pdf, 1 Mb), ascribing the property field and understanding of discrete optical systems with saturable nonlinearity. “We found the existence of multistability regions and here born the concept intermediate solution (IS), which is an unstable solution that connects two stable solutions. The importance of this work is to formulate a theoretical first complete this two guides, then actually found experimentally that there is a region of parameters where there is multistability and indirectly prove the existence of this intermediate solution”, Diego Guzmán said.

The authors were divided into two groups: Nonlinear Optics Division, from Santiago and researchers in the experimental group of Detlef Kip, in Hamburg. The first provided the theoretical part of the paper, with ideas and debates to explain the show. Researchers from Hamburg, meanwhile, carried out the experiment and took the data. “In nonlinear discrete systems found that there are multi-stability regions where there is more than one stable stationary solution in the same region of parameters (reference paper Opt. Lett. 36, 1467 (2011)). Then we wonder if the same thing happen in a system of only two waveguides. The beauty is that this system is completely soluble analytically, so it can be done with pencil and paper and do not need to do numerical calculations through a computer”, Diego said.

CEFOP researchers began work in late 2010, and by the end of 2011, the theoretical results were clear. Diego stressed that the most extensive was the pilot phase, which began in mid-2011. “The experiment was done several times, and at first the results were not as clear. This experimental setup was improved until the middle of 2012 we obtained sufficient data. Then came the part of data analysis that took about two months, then reach the final work”.

Contact with researchers from Hamburg, who had the necessary samples to corroborate the experiment and theory, allowed base a higher quality paper, with theoretical and experimental. “The experiments were made in a material called lithium niobate. Currently we are working on crystals SBN (strontium barium niobate), which while not the same material, share the fact that they can be described by saturable nonlinearities”, Guzmán said.

Diego Guzmán currently pursuing a master’s degree in Science with a major in Physics, with PhD. Rodrigo Vicencio, and is the first paper published in an international journal. “The line of study we have set with my tutor is on nonlinear optical discrete systems, so this work is in that direction and will be one of the items on my thesis.”



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