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21 papers · 1 filter
Non-linear space-time dynamics of ultrashort wave-packets in water
A. Matijosius, J. Trull, P. Di Trapani +4
We have monitored the space-time transformation of 150-fs pulse, undergoing self-focusing and filamentation in water, by means of the nonlinear gating tech- nique. We have observed…
Multiple filamentation induced by input-beam ellipticity
Audrius Dubietis, Gintaras Tamousauskas, Gadi Fibich +1
The standard explanation for multiple filamentation (MF) of intense laser beams has been that it is initiated by input beam noise (modulational instability). In this study we provi…
Observations of the pulsating subdwarf B star Feige 48: Constraints on evolution and companions
M. D. Reed, S. D. Kawaler
Since pulsating subdwarf B (sdBV or EC14026) stars were first discovered (Kilkenny et al, 1997), observational efforts have tried to realize their potential for constraining the in…
Space-time nonlinear compression and three-dimensional complex trapping in normal dispersion
G. Valiulis, J. Kilius, O. Jedrkiewicz +6
In positive phase-mismatched SHG and normal dispersion, a gaussian spatio-temporal pulse transforms spontaneously into a X-pulse, underlies spatio-temporal compression and eventual…
Light Filaments Without Self Guiding
Audrius Dubietis, Eugenijus Gaizauskas, Gintaras Tamosauskas +1
An examination of the propagation of intense 200 fs pulses in water reveals light filaments not sustained by the balance between Kerr-induced self-focusing and plasma-induced defoc…
Three dimensional imaging of short pulses
M. A. C. Potenza, S. Minardi, J. Trull +5
We exploit a slightly noncollinear second-harmonic cross-correlation scheme to map the 3D space-time intensity distribution of an unknown complex-shaped ultrashort optical pulse. W…