1. Spatial Beam Self-Cleaning in Second-Harmonic Generation
- Author
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R. Fona, Guy Millot, Stefan Wabnitz, Katarzyna Krupa, Badr Mohamed Ibrahim Shalaby, Vincent Couderc, Fabio Baronio, Alexis Labruyère, Alessandro Tonello, and Alejandro B. Aceves
- Subjects
Materials science ,Nonlinear optics ,Potassium titanyl phosphate ,lcsh:Medicine ,01 natural sciences ,Article ,010309 optics ,Crystal ,chemistry.chemical_compound ,Optics ,Brillouin scattering ,0103 physical sciences ,010306 general physics ,lcsh:Science ,Linear phase ,Multidisciplinary ,Multi-mode optical fiber ,business.industry ,ottica non lineare ,effetti traversi ,generazione di seconda armonica ,lcsh:R ,Single-mode optical fiber ,Second-harmonic generation ,chemistry ,Physics::Accelerator Physics ,lcsh:Q ,business ,Beam (structure) - 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.
- Published
- 2020
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