caa a22 4500 44536971X CHVBK 20180317142942.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00340-011-4649-2 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4649-2 Vortices in ultrashort laser pulses [Elektronische Daten] [P. Hansinger, A. Dreischuh, G. Paulus] The propagation of optical vortices nested in broadband femtosecond laser beams was studied both numerically and experimentally. Based on the nonlinear Schrödinger equation, the dynamics of different multiple-vortex configurations with varying topological charge were modelled in self-focussing and self-defocussing Kerr media. We find a similar behavior in both cases regarding the vortex-vortex interaction. However, the collapsing background beam alters the propagation for a positive nonlinearity. Regimes of regular and possibly stable multiple filamentation were identified this way. Experiments include measurements on pairs of filaments generated in a vortex beam on an astigmatic Gaussian background with argon gas as the nonlinear medium. Spectral broadening of these filaments leads to a supercontinuum which spans from the visible range into the infrared. Recompression yields <19fs pulses. Further optimization may lead to much better recompression. Springer-Verlag, 2011 Hansinger P. Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743, Jena, Germany aut Dreischuh A. Department of Quantum Electronics, Sofia University, 5, J. Bourchier Blvd., 1164, Sofia, Bulgaria aut Paulus G. Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743, Jena, Germany aut Applied Physics B Springer-Verlag 104/3(2011-09-01), 561-567 0946-2171 104:3<561 2011 104 340 https://doi.org/10.1007/s00340-011-4649-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4649-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hansinger P. Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743, Jena, Germany aut NATIONALLICENCE 700 1- Dreischuh A. Department of Quantum Electronics, Sofia University, 5, J. Bourchier Blvd., 1164, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Paulus G. Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743, Jena, Germany aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/3(2011-09-01), 561-567 0946-2171 104:3<561 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer