Pulse shortening due to filamentation in transparent medium

Kosareva, O.G.; Murtazin, I. N.; Panov, N. A.; Savel’ev, A. B.; Kandidov, V.P.; Chin, See Leang

doi:10.1002/lapl.200610081

Cited by 35 publications

(24 citation statements)

References 12 publications

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“…The filamentation in air is accompanied with third harmonic generation [17], and two color filament in air is used for generation of terahertz radiation [18][19][20]. The unique properties of femtosecond laser radiation in filamentary regime reveal new opportunities for development of atmo spheric optic systems [21], pulse compression [22][23][24], micro optics elements [25], various devices for nonlinear optical conversion of laser radiation [13,26].…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal evolution scenarios of femtosecond laser pulse filamentation in fused silica

2012

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We investigated the evolution of femtosecond laser pulses at different wavelengths corresponding to normal, zero, and anomalous regimes of group velocity dispersion (GVD) in fused silica. The laser pulse filamentation in different GVD regimes under the same similarity parameters was first considered. It was established numerically that the scenario of the pulse filamentation depends both on temporal factors, which are determined by pulse GVD and self phase modulation, and spatial factors associated with Kerr self focus ing and plasma defocusing. In presence of strong normal GVD the dispersive stretching causes, a pulse power decrease followed by lowering of the intensity in filament, electron density reduction in plasma channel, and suppressing of the refocusing. For zero GVD the multipeak regime of radiation propagation is realized in the filament as a result of recurring self focusings of powerful pulse tail, which was defocused in laser plasma. When GVD is anomalous a sequence of "light bullets" with duration about 10 fs forms in the filament. And the peak intensity in "light bullet" stays the same ≈ 5 × 10 13 W/cm 2 . In the regime of anomalous GVD power is transferred from the pulse edges to its center, where the repeated self focusings occur and form a "light bul let" sequence.

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Section: Introductionmentioning

confidence: 99%

Spatio-temporal evolution scenarios of femtosecond laser pulse filamentation in fused silica

2012

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“…Hence, the characteristic length of formation of a homogeneous waveguide channel is much smaller than the selffocusing length, Eq. (16). The smallness of this length justifies the separation of two stages in the field evolution: self-focusing and formation of a "homogeneous" waveguide structure.…”

Section: A Collapse Of 2d Wave Beamsmentioning

confidence: 99%

“…(a) Dependence of the length of self-focusing on the wave beam power. The dashed curve corresponds to analytical expression(16), and the solid one is the result of numerical simulation.Figure (b)shows the dependence of the effective localization region a 1/2 and its estimate (29) on the power P, the root-mean-square width a and the estimate for minimal width(13), correspondingly. (c) Dependence of the maximal output amplitude umax on the power P.…”

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confidence: 99%

Self-compression of spatially limited laser pulses in a system of coupled light-guides

et al. 2018

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The self-action features of wave packets propagating in a two-dimensional system of equidistantly arranged fibers are studied analytically and numerically on the basis of the discrete nonlinear Schrödinger equation. Self-consistent equations for the characteristic scales of a Gaussian wave packet are derived on the basis of the variational approach, which are proved numerically for powers P < 10Pcr exceeding slightly the critical one for self-focusing. At higher powers, the wave beams become filamented, and their amplitude is limited due to nonlinear breaking of the interaction between neighbor light-guides. This make impossible to collect a powerful wave beam into the single light-guide. The variational analysis show the possibility of adiabatic self-compression of soliton-like laser pulses in the process of their three-dimensional self-focusing to the central light-guide. However, the further increase of the field amplitude during self-compression leads to the longitudinal modulation instability development and formation of a set of light bullets in the central fiber. In the regime of hollow wave beams, filamentation instability becomes predominant. As a result, it becomes possible to form a set of light bullets in optical fibers located on the ring.

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“…The filamentation phenomenon contains useful physical processes, such as the dynamic interplay between the self-focusing caused by the optical Kerr effect and plasma defocusing, self-phase modulation, selfsteepening, and so on [1][2][3][4] . It has shown great value for remote sensing [5,6] , lightning control [7,8] , pulse compression [9][10][11] , and terahertz (THz) wave generation [12,13] .…”

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confidence: 99%