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- Title
Spatial Beam Self-Cleaning in Second-Harmonic Generation.
- Authors
Krupa, K.; Fona, R.; Tonello, A.; Labruyère, A.; Shalaby, B. M.; Wabnitz, S.; Baronio, F.; Aceves, A. B.; Millot, G.; Couderc, V.
- Abstract
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.
- Subjects
CLEANING; POTASSIUM titanyl phosphate; CRYSTALS; HARMONIC generation; LINEAR electric phase filters
- Publication
Scientific Reports, 2020, Vol 10, Issue 1, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-020-64080-7