Continuous transition from 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="sans-serif">X</mml:mi></mml:math>
- to 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="sans-serif">O</mml:mi></mml:math>
-shaped angle-wavelength spectra of a femtosecond filament in a gas mixture

Panov, N. A.; Nikolaeva, Irina; Компанец, В. О.; Чекалин, С. В.; Kosareva, O.G.

doi:10.1103/physreva.103.l021501

Cited by 6 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, theoretical studies have uncovered a host of structural field transitions for dispersion-free ST wave packets in dispersive media that have no analogs in free space, including a transition from X-shaped to O-shaped profiles while tuning the group velocity in presence of anomalous GVD [23], and even more complex transitions in the normal-GVD regime [22]. All such transitions occur at a fixed wavelength (in contrast to [80,81] where the transition requires changing the GVD sign). None of these phenomena have been observed to date, and an O-shaped ST wave packet has not yet been reported.…”

Section: Discussionmentioning

confidence: 99%

Canceling and inverting normal and anomalous group-velocity dispersion using space-time wave packets

Hall¹,

Abouraddy²

2022

Preprint

View full text Add to dashboard Cite

Angular dispersion can counterbalance normal group-velocity dispersion (GVD) that increases the wave-vector length in a dispersive medium. By tilting the wave vector, angular dispersion reduces the axial wave number in this case to match the pre-GVD value. By the same token, however, angular dispersion fails to counterbalance anomalous GVD, which in contrast reduces the wavevector length. Consequently, GVD-cancellation via angular dispersion has not been demonstrated to date in the anomalous dispersion regime. We synthesize here structured femtosecond pulsed beams known as 'space-time' wave packets designed to realize dispersion-cancellation symmetrically in either the normal-or anomalous-GVD regimes by virtue of non-differentiable angular dispersion inculcated into the pulsed field. Furthermore, we also verify GVD-inversion: reversing the GVD sign experienced by the field with respect to that dictated by the chromatic dispersion of the medium itself.

show abstract

Section: Discussionmentioning

confidence: 99%

Canceling and inverting normal and anomalous group-velocity dispersion using space-time wave packets

Hall¹,

Abouraddy²

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…[22] All such transitions occur at a fixed wavelength (in contrast to refs. [65,66] where the transition requires changing the GVD sign). None of these phenomena have been observed to date, and an O-shaped ST wave packet has not yet been reported.…”

Section: Discussionmentioning

confidence: 99%

Canceling and Inverting Normal and Anomalous Group‐Velocity Dispersion Using Space‐Time Wave Packets

Hall

Abouraddy

2022

Laser & Photonics Reviews

View full text Add to dashboard Cite

Angular dispersion can counterbalance normal group‐velocity dispersion (GVD) that increases the wave‐vector length in a dispersive medium. By tilting the wave vector, angular dispersion reduces the axial wave number in this case to match the pre‐GVD value. By the same token, however, angular dispersion fails to counterbalance anomalous GVD, which in contrast reduces the wave‐vector length. Consequently, GVD‐cancellation via angular dispersion has not been demonstrated to date in the anomalous dispersion regime. Here, structed femtosecond pulsed beams, known as ‘space‐time’ wave packets, are designed to realize dispersion‐cancellation symmetrically in either the normal‐ or anomalous‐GVD regimes by virtue of non‐differentiable angular dispersion inculcated into the pulsed field. Furthermore, GVD‐inversion is also verified by reversing the GVD sign experienced by the field with respect to that dictated by the chromatic dispersion of the medium itself.

show abstract

“…The nonlinear current in Equation ( 1) J(t) = J free + J abs + ∂P inst /∂t + ∂P rot /∂t includes free electron J free (t) and absorption J abs (t) currents, the third-order instantaneous P inst (t) and delayed P rot polarization, see the details in Ref. [55]. Technical details about the grids used can be found in Ref.…”

Section: Simulationsmentioning

confidence: 99%

Tracing Evolution of Angle-Wavelength Spectrum along the 40-m Postfilament in Corridor Air

et al. 2021

Self Cite

View full text Add to dashboard Cite

Postfilamentation channel resulting from filamentation of freely propagating 744-nm, 5-mJ, 110-fs pulse in the corridor air is examined experimentally and in simulations. The longitudinal extension of postfilament was determined to be 55–95 m from the compressor output. Using single-shot angle-wavelength spectra measurements, we observed a series of red-shifted maxima in the spectrum, localized on the beam axis with the divergence below 0.5 mrad. In the range 55–70 m, the number of maxima and their red-shift increase with the distance reaching 1 μm, while the pulse duration measured by the autocorrelation technique is approximately constant. Further on, for distances larger than 70 m and up to 95 m, the propagation is characterized by the suppressed beam divergence and unchanged pulse spectrum. The pulse duration increases due to the normal air dispersion.

show abstract

Continuous transition from X - to O -shaped angle-wavelength spectra of a femtosecond filament in a gas mixture

Cited by 6 publications

References 31 publications

Canceling and inverting normal and anomalous group-velocity dispersion using space-time wave packets

Canceling and inverting normal and anomalous group-velocity dispersion using space-time wave packets

Canceling and Inverting Normal and Anomalous Group‐Velocity Dispersion Using Space‐Time Wave Packets

Tracing Evolution of Angle-Wavelength Spectrum along the 40-m Postfilament in Corridor Air

Contact Info

Product

Resources

About