The mode structure of broadband radiation with the spectrum from 200 to 2500 nm, which is obtained in the process of soliton self-compression of a laser pulse in an antiresonant hollow-core fiber, has been analyzed. It has been demonstrated that the most energy-intensive infrared part of radiation from 1300 to 2500 nm, which forms a single-cycle pulse, is localized in the fundamental spatial mode LP01. Under phase matching conditions in the visible part of the supercontinuum, the third harmonic is generated near 620 nm in high‑order modes and tube modes. It has been shown that the third harmonic radiation at a wavelength of about 700 nm localized in the core of the fiber can be used to measure the phase of the field with respect to the envelope of ultrashort pulses at the output of the fiber.
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ACKNOWLEDGMENTS
We are grateful to Prof. A.M. Zheltikov, the head of our research group, for general support.
Funding
This work was supported by the Russian Science Foundation (project no. 22-12-00149, study of the mode structure of radiation and the formation of a short infrared pulse) and by the Russian Foundation for Basic Research (project nos. 20-21-00131 and 19-29-12062, study of the effect of the phase of an ultrashort pulse).
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Savitsky, I.V., Stepanov, E.A., Lanin, A.A. et al. Mode Structure of Supercontinuum Generated by Ultrashort Pulses in Antiresonant Hollow-Core Fibers. Jetp Lett. 117, 286–291 (2023). https://doi.org/10.1134/S0021364022603074
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DOI: https://doi.org/10.1134/S0021364022603074