Arbitrary-order non-linear contribution to self-steepening

Details Arbitrary-order non-linear contribution to self-steepening Arbitrary-order non-linear contribution to self-steepening

2010-11-06

arxiv.org/abs/1011.1575v1

Optics Letters 35, 2795 (2010)

Physics

Optics

10 pages, 3 figures (14 panels)

Scientific paper

10.1364/OL.35.002795

Based on the recently published generalized Miller formula, we derive the spectral dependence of the contribution of arbitrary-order non-linear indices to the group-velocity index. We show that in the context of laser filamentation in gases all experimentally-accessible orders (up to the $9^{th}$-order non-linear susceptibility $\chi^{(9)}$ in air and $\chi^{(11)}$ in argon) have contributions of alternative signs and similar magnitudes. Moreover, we show both analytically and numerically that the dispersion term of the non-linear indices must be considered when computing the intensity-dependent group velocity.

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