Abstract
It is shown that the self-focusing of pulsed terahertz radiation with a spectrum in a region of anomalous group-velocity dispersion of a dielectric medium can be suppressed by such dispersion, in which pulse self-compression is characteristic of positive nonlinearity. The lower the ratio of a wave packet’s length of dispersion to that of diffraction in the medium, the more the self-focusing of a wave with the considered spectrum requires an excess of power over the critical value of self-focusing. Temporal compression of the wave starts before its spatial self-focusing at a length of diffraction shorter than that of dispersion, and vice versa for a longer one.
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ACKNOWLEDGMENTS
The authors are grateful to Аcademician A.G. Litvak for the idea of analyzing the observed effect of the almost complete suppression of the self-focusing of ultrashort pulses caused by dispersion dominating over diffraction in the region of anomalous group dispersion, due to the self-focusing of pulses in this spectral range.
Funding
This work was supported by the Russian Foundation for Basic Research, project no. 19-02-00154.
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Translated by G. Dedkov
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Drozdov, A.A., Kozlov, S.A. Self-Focusing of Pulsed Terahertz Radiation with a Spectrum in the Region of Anomalous Group-Velocity Dispersion of a Dielectric Medium. Bull. Russ. Acad. Sci. Phys. 86, 760–764 (2022). https://doi.org/10.3103/S1062873822060090
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DOI: https://doi.org/10.3103/S1062873822060090