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Influence of tunnel ionization to third-harmonic generation of infrared femtosecond laser pulses in air [article]

Viktorija Tamulienė, Greta Juškevičiūtė, Danas Buožius, Virgilijus Vaičaitis, Ihar Babushkin, Uwe Morgner, University, My
2021

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Here we present an experimental as well as theoretical study of third-harmonic generation in tightly focused femtosecond filaments in air at the wavelength of 1.5μm. At low intensities, longitudinal phase matching is dominating in the formation of 3rd harmonics, whereas at higher intensities locked X-waves are formed. We provide the arguments that the X-wave formation is governed mainly by the tunnel-like ionization dynamics rather than by the multiphoton one. Despite of this fact, the impact
more » ... the ionization-induced nonlinearity is lower than the one from bound–bound transitions at all intensities. © 2020, The Author(s).
doi:10.15488/10802 fatcat:qwfrzwpiezfr3dy52xgcrrc3vi
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Viktorija Tamulienė, Greta Juškevičiūtė, Danas Buožius, Virgilijus Vaičaitis, Ihar Babushkin, Uwe Morgner, University, My. "Influence of tunnel ionization to third-harmonic generation of infrared femtosecond laser pulses in air." (2021)