Spatial Beam Self-Cleaning in Second-Harmonic Generation.

Date publication

avril 2020

Journal

Scientific reports

Auteurs

Membres identifiés du Cancéropôle Est :
Pr MILLOT Guy

Tous les auteurs :
Krupa K, Fona R, Tonello A, Labruyère A, Shalaby BM, Wabnitz S, Baronio F, Aceves AB, Millot G, Couderc V

Lien Pubmed

https://www.ncbi.nlm.nih.gov/pubmed/32350305

Résumé

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.

Référence

Sci Rep. 2020 04 29;10(1):7204