Defocusing role in femtosecond filamentation: Higher-order Kerr effect or plasma effect?<xref ref-type="fn" rid="cpb151573fn1">*</xref>

Defocusing role in femtosecond filamentation: Higher-order Kerr effect or plasma effect?*

Li Su-Yu^a),^b), Guo Fu-Ming^a),^b), Yang Yu-Jun^a),^b), Jin Ming-Xing^a),^b)

Evolution of the maximum intensity (a) and on-axis electron density (b) with the propagation distance z , as the MPI cross section is σ ₈ = 2.88 × 10⁻⁹⁹ s⁻¹ · cm¹⁶ · W⁻⁸;^{[ 29 ]} evolution of the maximum intensity (c) and on-axis electron density (d) with the propagation distance z , as the MPI cross section is σ ₈ = 2.81 × 10⁻⁹⁶ s⁻¹ · cm¹⁶ · W⁻⁸.^{[ 30 ]}