Abstract
The beam self-cleaning phenomenon is theoretically predicted by the two-dimensional nonlinear Schrödinger equation, which describes self-focusing, and is observed in the case of femtosecond laser filamentation in the collimated regime of propagation. However, the impact of external focusing on the self-cleaning has not been investigated so far. In this paper we systematically study this impact in a wide range of focusing conditions. We show that the energy range, in which self-cleaning can be observed, shrinks monotonically with the numerical aperture growth at some point vanishing at all.
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Data Availability
Due to confidentiality agreements between authors, data and/or its analysis during the current study is available from the corresponding author [D. V. Pushkarev via email: d-push@yandex.ru] on reasonable request to bona fide researchers.
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The work is supported by Russian Science Foundation (Grant 21-12-00109).
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All authors participated in experiments and data processing. D. V. P., G. E. R. and L. V. S. have written the main manuscript. All authors contributed to the revision.
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Pushkarev, D.V., Rizaev, G.E., Mokrousova, D.V. et al. Focused beam self-cleaning during laser filamentation. Opt Quant Electron 55, 577 (2023). https://doi.org/10.1007/s11082-023-04861-2
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DOI: https://doi.org/10.1007/s11082-023-04861-2