Abstract
The formation of light bullets in mid-IR femtosecond filamentation is investigated numerically by means of the unidirectional pulse propagation equation (UPPE). A general approach for light bullets formation is presented for condensed media under anomalous GVD. The main parameters of the light bullets are evaluated. The features of super continuum and odd harmonic generation accompanying the light bullets formation are analyzed.
Highlights
An appearance of new hight-power femtosecond laser sources in MID-IR wavelength region [1] leads to an active research of MID-IR laser filamentation regimes in both, condensed transparent dielectrics [2, 3] and gases [4–6]
The modeling was performed by means of unidirectional pulse propagation equation
That the main spatio-temporal features of the light bullets (LB) formation at 3.1μm in LiF are similar to those for LBs formation at 1.8μm in fused silica [8]
Summary
An appearance of new hight-power femtosecond laser sources in MID-IR wavelength region [1] leads to an active research of MID-IR laser filamentation regimes in both, condensed transparent dielectrics [2, 3] and gases [4–6]. The modeling was performed by means of unidirectional pulse propagation equation. Two χ(3) − based effects are included: Kerr nonlinearity and third harmonic generation, that leads to a cascade generation of odd harmonics.
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