Narrow intensity range optical anisotropy in air induced by a femtosecond laser breakdown

In this paper, we study the optical anisotropy induced by femtosecond laser radiation in air during an optical breakdown. Using a transverse pump-probe technique, we demonstrate that this anisotropy appears in a narrow range of pump intensities, which are close to the optical breakdown threshold in...

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Veröffentlicht in:Applied optics (2004) 2023-10, Vol.62 (30), p.8000-8006
Hauptverfasser: Ushakov, Aleksandr, Chizhov, Pavel, Bukin, Vladimir, Dolmatov, Timophey, Garnov, Sergey
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Sprache:eng
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Zusammenfassung:In this paper, we study the optical anisotropy induced by femtosecond laser radiation in air during an optical breakdown. Using a transverse pump-probe technique, we demonstrate that this anisotropy appears in a narrow range of pump intensities, which are close to the optical breakdown threshold in air and lead to a phase shift of probe radiation, polarized collinear to the pump. The intensity range where an induced intense anisotropy occurs makes it possible to estimate the magnitude of the 5th-order Kerr nonlinear refractive index component in air.
ISSN:1559-128X
2155-3165
1539-4522
DOI:10.1364/AO.501842