Effect of nonlinearity in the pass-through optics on femtosecond laser filament in air
Dergachev, Alexander A. · Ionin, Andrey A. · Kandidov, Valery P. · Mokrousova, Daria V. · Seleznev, Leonid V. · Sinitsyn, Dmitry V. · Sunchugasheva, Elena S. · Shlenov, Svyatoslav A. · Shustikova, Anna P.
Original · EN
An influence of pass-through optics on femtosecond laser pulse filamentation in ambient air is analyzed for the first time both experimentally and numerically. Propagation of high-power femtosecond laser pulse through solid optical elements introduces spatiotemporal phase modulation due to the Kerr effect. This modulation may have a strong ef-fect on the pulse filamentation in air. We demonstrated that the phase modulation obtained in the thin pass-through dielectric plate reduces the distance to the filament onset and increases the plasma channel length
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