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In this work multiple refocusing of femtosecond pulse in liquid (methanol) is studied both experimentally and numerically. We focused a 38 fs laser pulse, which is spatially filtered, into a glass cell containing a very dilute solution of Coumarin 440 in methanol. Via three photon fluorescence of coumarin, up to 6 refocusing peaks were observed along the direction of the pulse propagation. This is...
We observe multiple filaments and interference of their ring structures in the propagation of 14 mJ, 45 fs infrared laser pulse in air. We suggest a simple physical model describing the formation and the interference of rings as the result of superposition of the background field of the whole beam and the fields that diverge from the filaments due to the defocusing in the laser-produced plasma. The...
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