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Opt Lett. 2011 Apr 1;36(7):1035-7. doi: 10.1364/OL.36.001035.

Arrest of self-focusing collapse in femtosecond air filaments: higher order Kerr or plasma defocusing?

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International Laser Center & Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia.


Experimentally measured conical emission rings on the blue side of the filament supercontinuum of a 800 nm 50 fs pulse in air are reproduced in simulations with plasma and the third-order Kerr as the nonlinear terms. This agreement indicates plasma as the dominant mechanism arresting the self-focusing collapse. The higher order Kerr terms with the recently measured coefficients stop the collapse at a lower intensity than the plasma does and lead to the spherical angle-wavelength spectrum without blueshifted rings.

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