Filamentation of femtosecond Ti:Sapphire-laser pulses at the first and second harmonics in liquid media
D.V. Apeksimov1, O.A. Bukin2, E.E. Bykova1, S.S. Golik3, A.A. Zemlyanov1, A.A. Ilyin2, A.M. Kabanov1, G.G. Matvienko1, V.K. Oshlakov1, A.V. Petrov1, E.B. Sokolova2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
2Institute of Automation and Control Prosesses Far Easten Branch of the Russian Academy of Science, 5 Radio Street, Vladivostok, 690041
3Far-Eastern Federal University, 8, Suhanova St., Vladivostok, 690950, Russia
Keywords: laser radiation, filamentation, femtosecond pulse, liquid media, spectrum
Abstract
The experimental results on transformation of the spectral and spatial characteristics of femtosecond Ti:Sapphire-laser pulses with the wavelengths of 800 and 400 nm at both harmonics during filamentation in liquid media are presented. It is shown that spectral broadening of a laser pulse at the expense of phase self-modulation in a medium with cubic nonlinearity depends on pulse power and beam diameter. Emission with maximum at 464 nm is observed during filamentation of the pulses with wavelength of 400 nm in distilled water, which corresponds to stimulated Raman scattering of the water. Fluorescence of dissolved organic matters is observed in sea water.
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