Self-similar Shape Mode of Optical Pulse Propagation in Medium with non-stationary Absorption

23rd International Laser Physics Workshop

Trofimov, Vycheslav A.^1 ; Lysak, Tatyana M.^1 ; Fedotov, Mihail V.^1 ; Prokopenko, Alexander S.^1

Lomonosov Moscow State University, Moscow

119992, Russia^1

关键词: Analytical approach;    Femtosecond laser pulse propagation;    Laser induced plasma;    Laser pulse propagation;    Nonlinear absorptions;    Nonstationary;    Optical pulse propagation;    Physical mechanism;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/594/1/012034/pdf
DOI  :  10.1088/1742-6596/594/1/012034

来源: IOP

【 摘 要 】

We discuss laser pulse propagation with the self-similar shape in a medium with instantaneous nonlinear absorption. We consider two cases of the laser pulse propagation. First one corresponds to problem of laser-induced plasma generation in silica under action of TW laser pulse. The second one corresponds to femtosecond laser pulse propagation in medium with nanoparticles of noble metals. In both cases the mode of the self-similar shape of pulse is of interest. We discuss also a physical mechanism of non-linear acceleration or slowing-down for laser pulse propagation in a medium with nanoparticles. The last phenomena are important, in particular, for a problem of data processing of all optical method. We used analytical approach for considered problem as well as computer simulation.