Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 32: Photonics and Biophotonics II
Q 32.8: Talk
Wednesday, March 4, 2026, 16:15–16:30, P 3
The Gouy phase of singular beams — •Lyubomir Stoyanov1,2, Gerhard G. Paulus3,4, and Alexander Dreischuh1,2 — 1Sofia University, Faculty of Physics, Department of Quantum electronics, Sofia, Bulgaria — 2National Centre of Excellence Mechatronics and Clean Technologies, Sofia, Bulgaria — 3Institute of Optics and Quantum Electronics, Friedrich Schiller University, Jena, Germany — 4Helmholtz Institute Jena, Jena, Germany
Ever since the first observation of the second harmonic generation (SHG) of the emission of a ruby laser, the nonlinear optics attracts continuous research interest and is a subject of intensive further development. Part of it, is the singular nonlinear optics, a field in photonics in which the objects of interest are beams/pulses with phase and/or polarization dislocations. Not that obvious, but Bessel-Gaussian beams (beams carrying a finite number of concentric rings surrounding a central peak/ring.) can also be classified as singular beams because of these radial phase jumps of π characteristic for their phase profiles. Here we demonstrate both experimentally and by numerical simulations a strong reshaping of the second harmonics of zeroth- and first-order Bessel-Gaussian beams (BGBs). Detailed interferometric measurements showing flat phase profiles of the broadened central part of the SH beam, and between it and the neighboring rings, will be presented, discussed, and compared with numerical simulations. Numerical simulations for third harmonic generation will also be presented and discussed.
Keywords: Nonlinear optics; Singular optics; Bessel beam