Abstract：
: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 [Formula: see text]. 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 of the ionization-induced nonlinearity is lower than the one from bound-bound transitions at all intensities.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Tamulienė V,Juškevičiūtė G,Buožius D,Vaičaitis V,Babushkin I,Morgner Udoi
10.1038/s41598-020-74263-xsubject
Has Abstractpub_date
2020-10-15 00:00:00pages
17437issue
1issn
2045-2322pii
10.1038/s41598-020-74263-xjournal_volume
10pub_type
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