22 March 2011 Catastrophic self-focusing of axially symmetric laser beams due to cascading SHG
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Proceedings Volume 7822, Laser Optics 2010; 78220E (2011) https://doi.org/10.1117/12.891265
Event: Laser Optics 2010, 2010, St. Petersburg, Russian Federation
Self-focusing and defocusing of optical radiation with Gaussian spatial and temporal distribution due to cascading SHG without significant changing of beam profile and pulse shape for fundamental wave under the condition of group velocity in the axial-symmetric case for bulk medium is considered. We show the possibility of strong self-focusing of optical radiation: maximum intensity increases in 70 and more times in comparison with intensity of incident optical radiation. These results are obtained for pulse duration, which belongs to time interval from microseconds to picoseconds, for which dispersions of group velocity are negligible. A propagation of laser radiation without changing of its pulse shape and beam profile takes place till the formation of the first nonlinear focus. Spatio-temporal intensity distribution near the other nonlinear focus can be strongly distinguished from Gaussian one. For corresponding choice of mismatching of wave vectors the losses of energy at fundamental wave because of its conversion to the wave with doubling frequency is less than 1%. Self-focusing of laser radiation allows the possibility for realization of the regime which is similar to Kerr-lens mode locking, but for laser systems generating optical radiation with duration from microsecond to picosecond duration.
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V. A. Trofimov, V. A. Trofimov, T. M. Lysak, T. M. Lysak, } "Catastrophic self-focusing of axially symmetric laser beams due to cascading SHG", Proc. SPIE 7822, Laser Optics 2010, 78220E (22 March 2011); doi: 10.1117/12.891265; https://doi.org/10.1117/12.891265

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