Adiabatic self-focusing in media with spatially variable nonlinearity |
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Authors: | Fares Luai Al Devaux Fabrice Chauvet Mathieu |
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Affiliation: | FEMTO-ST, UMR CNRS 6174, Université de Franche-Comté, 16 Route de Gray, 25000 Besan?on, France. |
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Abstract: | An optical medium whose nonlinearity can be spatially adjusted is considered to study beam reshaping. The concept is applied to perform adiabatic self-focusing of broad beams. Experimental results are obtained in a photorefractive lithium niobate crystal where the self-focusing nonlinearity is controlled over propagation by a temperature gradient. As a demonstration, gradual self-focusing is shown to transform an incoming beam into an output circular spot 10 times smaller over a 2 cm long crystal submitted to a 30 °C temperature gradient. Once formed, the adiabatic self-focused beam has inscribed a funnel waveguide in the crystal. |
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