Аннотация
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.
Язык оригинала | английский |
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Номер статьи | 7204 |
Число страниц | 9 |
Журнал | Scientific Reports |
Том | 10 |
Номер выпуска | 1 |
DOI | |
Состояние | Опубликовано - 29 апр 2020 |