Spatial Beam Self-Cleaning in Second-Harmonic Generation

We experimentally demonstrate the spatial self-cleaning of a highly multimode optical beam, in the process of second-harmonic generation in a quadratic nonlinear potassium titanyl phosphate crystal. As the beam energy grows larger, the output beam from the crystal evolves from a highly speckled inte...

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Published inScientific reports Vol. 10; no. 1; p. 7204
Main Authors Krupa, K, Fona, R, Tonello, A, Labruyère, A, Shalaby, B M, Wabnitz, S, Baronio, F, Aceves, A B, Millot, G, Couderc, V
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 29.04.2020
Nature Publishing Group UK
Subjects
Energy
Experiments
Lasers
Potassium
Propagation
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Summary:We experimentally demonstrate the spatial self-cleaning of a highly multimode optical beam, in the process of second-harmonic generation in a quadratic nonlinear potassium titanyl phosphate crystal. As the beam energy grows larger, the output beam from the crystal evolves from a highly speckled intensity pattern into a single, bell-shaped spot, sitting on a low energy background. We demonstrate that quadratic beam cleanup is accompanied by significant self-focusing of the fundamental beam, for both positive and negative signs of the linear phase mismatch close to the phase-matching condition.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-64080-7