Abstract
We investigate numerically an influence of the absorption spectrum width and the absorption spectrum central frequency shift on novel type of solitons (chirped soliton) appearence at a femtosecond pulse propagation in a medium with noble nanoparticles. We take into account the TPA of laser radiation by nanorods, and time-dependent nanorod aspect ratio changing due to their melting or reshaping because of laser energy absorption. The chirped solitons are formed due to the trapping of laser radiation by the nanorods reshaping fronts, if a positive or negative phase-amplitude grating is induced by laser radiation. We consider both linear and strong nonlinear dependences of absorption coefficient on the nanorod aspect ratio. We discuss a physical mechanism of the absorption spectrum width influence on the accelerating soliton formation.
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