From Filamentation in Condensed Media to Filamentation in Gases

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Abstract
We demonstrated how the moving focus model developed for condensed media should be modified for the explanation of experiments on filamentation of high-power femtosecond laser pulses in air. This modification is based on the consideration of gas ionization in high-intensity laser field. Numerical simulations based on this modified model allow for the explanation not only of filamentation itself but also the accompanying phenomena such as refocusing and conical emission.

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