Experimentally measured conical emission rings on the blue side of the filament supercontinuum of a $800\mathrm{nm}$ $50\mathrm{fs}$ 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.

© 2011 Optical Society of America

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