Consideration is based on computer simulation of the laser pulse propagation with taking into account a self- and cross- modulation of interacting waves, and their SOD, and phase mismatching. Observed sub-pulse formation can be used for generation of sequence of attosecond pulses with soliton or soliton-like shape.
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Vyacheslav A. Trofimov, Pavel S. Sidorov, Maria M. Loginova, "Formation of sub-femtosecond sub-pulses at THG of femtosecond laser pulse," Proc. SPIE 10530, Ultrafast Phenomena and Nanophotonics XXII, 1053005 (22 February 2018);