Abstract
We demonstrate a three orders of magnitude increase and stability in the backscattered fluorescence signal from nitrogen molecules by terawatt femtosecond laser pulse induced air filaments using a new method. The method is based on squeezing the initial beam diameter using a telescope. The effect of laser shot-to-shot fluctuations was included in numerical simulations by a random distribution of the initial intensity in both squeezed and non-squeezed beams. Statistical processing of the simulation results shows that the average diameter of plasma channels as well as the total amount of free electrons generated in a bunch of multiple filaments in air is larger in the squeezed beam. Shot-to-shot stability of the simulated plasma density increases in the squeezed beam. The change of this plasma density with propagation distance is in good qualitative agreement with the change of the range-corrected nitrogen fluorescence signal with distance.
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42.65.Jx; 42.60.Jf; 42.68.Ay; 42.68.Wt
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Kosareva, O., Panov, N., Akozbek, N. et al. Controlling a bunch of multiple filaments by means of a beam diameter. Appl. Phys. B 82, 111–122 (2006). https://doi.org/10.1007/s00340-005-1958-3
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DOI: https://doi.org/10.1007/s00340-005-1958-3