caa a22 4500 44537070X CHVBK 20180317142945.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00340-011-4586-0 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4586-0 Conical emission in focused beams: analysis of contributing factors and elimination of scattering [Elektronische Daten] [S. Klimentov, P. Pivovarov, N. Fedorov, S. Guizard, F. Dausinger, V. Konov] We report a detailed analysis of experimental parameters and fundamental mechanisms contributing to the strong nonlinear scattering of femtosecond and short picosecond laser pulses (50-6000 fs) at focusing in ambient air and protecting gases. The experimental conditions under consideration are typical for a variety of applications: micromachining of metals and dielectrics, high power laser exposure of targets. Such scattering, being the most noticeable manifestation of the complex phenomenon of conical emission in the focusing geometry, puts fundamental limitations to the incident power of precision laser targeting, restricting in this way potential productivity of micromachining in this pulse width range. The phenomena analyzed here are: ionization, the optical Kerr effect, the distortion of spectra via self-phase modulation, and the refractive ability of microplasma, namely the scattering. Characteristics of the last were investigated with respect to the incident wavelength and pulse width, for focusing of Gaussian and flat-top beams of different diameters. The obtained extensive data allowed us to trace the clue trends and relationships of this phenomenon and to find several ways to reduce or even eliminate the scattering in a broad range of the incident energies. Springer-Verlag, 2011 Klimentov S. General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow, Russia aut Pivovarov P. General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow, Russia aut Fedorov N. Ecole Polytechnique, 91128, Palaiseau, France aut Guizard S. Ecole Polytechnique, 91128, Palaiseau, France aut Dausinger F. FGSW, University of Stuttgart, Pfaffenwaldring 43, 70569, Stuttgart, Germany aut Konov V. General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow, Russia aut Applied Physics B Springer-Verlag 105/3(2011-11-01), 495-501 0946-2171 105:3<495 2011 105 340 https://doi.org/10.1007/s00340-011-4586-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4586-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Klimentov S. General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Pivovarov P. General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Fedorov N. Ecole Polytechnique, 91128, Palaiseau, France aut NATIONALLICENCE 700 1- Guizard S. Ecole Polytechnique, 91128, Palaiseau, France aut NATIONALLICENCE 700 1- Dausinger F. FGSW, University of Stuttgart, Pfaffenwaldring 43, 70569, Stuttgart, Germany aut NATIONALLICENCE 700 1- Konov V. General Physics Institute of the Russian Academy of Sciences, Vavilov str. 38, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 105/3(2011-11-01), 495-501 0946-2171 105:3<495 2011 105 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer