Stimulated Raman X waves in ultrashort optical pulse filamentation

Faccio, Daniele; Averchi, A.; Dubietis, A.; Polesana, P.; Piskarskas, A.; Trapani, P. Di; Couairon, Arnaud

doi:10.1364/ol.32.000184

Cited by 32 publications

(30 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Raman pulse, which is generated and slowed down by the SRS process, forms a slowlight spatial soliton. Note that the slow-light process presented here has to be distinguished from the mechanism of group-velocity locking for the stimulated Raman X waves generation in ultrashort optical pulse filamention though the observations seem to be similar to those reported here [27].…”

supporting

confidence: 81%

Slow-Light Spatial Solitons

et al. 2008

View full text Add to dashboard Cite

We numerically and experimentally report the observation of slow-light spatial solitons in a Kerr medium owing to light amplification by stimulated Raman scattering. This was achieved in a CS2 nonlinear planar waveguide that possesses both a strong self-focusing nonlinearity to generate the spatial Raman soliton and a Raman susceptibility sharp enough to induce the slow-light process simultaneously. We show that the Raman Stokes component is optically delayed by more than 120 ps for a 140 ps Raman pulse duration and only 3 cm of propagation length, while propagating as a spatial soliton beam.

show abstract

supporting

confidence: 81%

Slow-Light Spatial Solitons

et al. 2008

View full text Add to dashboard Cite

show abstract

“…In spite of this, a conversion efficiency of 75% to the Raman wavelength was measured for a 5 cm long ethanol cell. By using a delayed seed at the Raman shifted wavelength, Faccio et al (2007) showed that the temporal overlap of the seed with one of the split pulses from the pump leads to the preferential excitation of a single set of X-tails of the Raman X pulse, i.e., a half Raman-X on the blue or on the red side of the Stokes wavelength. This suggests that the Raman X-wave, as for the pump, is formed by two half-X waves which are the red (or blue) legs of a blueshifted (or redshifted) X-wave with a frequency gap.…”

Section: Frequency Conversion To Raman-excited Modes By Filamentsmentioning

confidence: 99%

Femtosecond filamentation in transparent media

2007

View full text Add to dashboard Cite

“…The so-called nonlinear X waves were observed in phasemismatched SHG processes [24,25] (recently also in a different regime in [26]), as well as investigated in Kerr media [27][28][29][30]. The nonlinear X waves are weakly localized nondiffracting and nondispersing wave packets characterized by a nonseparable spatiotemporal profile (propagation invariant solutions) [31,32], accessible in the normal group-velocity dispersion regime, the formation of which is triggered by conical emission [33].…”

Section: Introductionmentioning

confidence: 99%

Propagation dynamics and X-pulse formation in phase-mismatched second-harmonic generation

et al. 2011

View full text Add to dashboard Cite

This paper concerns the theoretical, numerical, and experimental study of the second-harmonic-generation (SHG) process under conditions of phase and group-velocity mismatch and aims to demonstrate the dimensionality transition of the SHG process caused by the change of the fundamental wave diameter. We show that SHG from a narrow fundamental beam leads to the spontaneous self-phase-matching process with, in addition, the appearance of angular dispersion for the off-axis frequency components generated. The angular dispersion sustains the formation of the short X pulse in the second harmonic (SH) and is recognized as three-dimensional (3D) dynamics. On the contrary, the large-diameter fundamental beam reduces the number of the degrees of freedom, does not allow the generation of the angular dispersion, and maintains the so-called one-dimensional (1D) SHG dynamics, where the self-phase-matching appears just for axial components and is accompanied by the shrinking of the SH temporal bandwidth, and sustains a long SH pulse formation. The transition from long SH pulse generation typical of the 1D dynamics to the short 3D X pulse is illustrated numerically and experimentally by changing the conditions from the self-defocusing to the self-focusing regime by simply tuning the phase mismatch. The numerical and experimental verification of the analytical results are also presented.

show abstract

Stimulated Raman X waves in ultrashort optical pulse filamentation

Cited by 32 publications

References 15 publications

Slow-Light Spatial Solitons

Slow-Light Spatial Solitons

Femtosecond filamentation in transparent media

Propagation dynamics and X-pulse formation in phase-mismatched second-harmonic generation

Contact Info

Product

Resources

About