Nonlinear transparency window for ultraintense femtosecond laser pulses in the atmosphere

Panov, N. A.; Saletsky, A. M.; Liu, Weiwei; Polynkin, Pavel; Kosareva, O.G.

doi:10.1103/physreva.100.023832

Cited by 14 publications

(3 citation statements)

References 45 publications

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“…Numerical simulations in the conditions of our experiment on a 100-m path were carried out to quantify the pulse intensity distribution in the filament and postfilamentation channel. We used the Forward Maxwell equation (FME, paraxial propagation equation for carrier-wave-resolved fields 39,40 ) in axially-symmetrical geometry (t, r) + z due to the moderate pulse powers in our experiment. The nonlinear source term in FME includes transient photocurrent as well as the thirdorder instantaneous and delayed nonlinearities.…”

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confidence: 99%

Remote triggering of air-gap discharge by a femtosecond laser filament and postfilament at distances up to 80 m

Kosareva

Mokrousova

Panov

et al. 2021

Applied Physics Letters

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We experimentally observed a laser-induced remote high-voltage discharge triggering between two needle electrodes with half-a-cm spacing. The discharge was initiated by a 744-nm, 90-fs, 6-mJ laser pulse undergoing filamentation in air. For the direct voltage below the self-breakdown threshold, triggering of air-gap discharge was synchronized with 10-Hz laser repetition rate and occurred between 40 and 80 m of the propagation path. No discharge guiding was observed. The experimentally registered and simulated remote triggering probability was above 80% in the range of 40-65 m from laser output, and about 50% in the range of 65-80 m. The probability decreases as the postfilament hot spot diverges with simultaneous increase of stochastic laser beam wandering.

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confidence: 99%

Remote triggering of air-gap discharge by a femtosecond laser filament and postfilament at distances up to 80 m

Kosareva

Mokrousova

Panov

et al. 2021

Applied Physics Letters

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“…Numerical simulations are based on the Forward Maxwell Equation (FME) [52][53][54], a paraxial carrier-wave-resolved propagation equation for the time-domain Fourier harmonics Ê(ω, r, z) of the electric field E(t, r, z):…”

Section: Simulationsmentioning

confidence: 99%

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

et al. 2021

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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.

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“…Infrared femtosecond pulses are recognized in spectroscopy (both linear [1] and nonlinear [2]), electron acceleration [3], high-order harmonic generation [4,5], atmospheric science [6,7], etc. Two-color (with two carrier frequencies ω 0 and 2ω 0 corresponding to wavelengths λ 0 and λ 0 /2) air-based mid-infrared (MIR) plasma THz sources [8] have been shown to be more efficient as compared with the near-infrared ones [9].…”

Section: Introductionmentioning

confidence: 99%

Scaling Law of THz Yield from Two-Color Femtosecond Filament for Fixed Pump Power

et al. 2022

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In 3D + time numerical simulations, we study the wavelength scaling law for the energy of terahertz (THz) radiation emitted from a two-color femtosecond filament, which forms during cofocusing into air the fundamental and second harmonics of the laser pulse. In our simulations, the central wavelength of the fundamental harmonic varied from 0.8 to 8 μm and the numerical aperture varied from 0.006 to 0.03. While the harmonics and supercontinuum development are not extreme, so the harmonics spectra are clearly separated, the energy of the generated THz radiation is proportional to the oscillation energy of the electrons, which grows as the squared pump wavelength, and the total number of free electrons in the filament, which decreases quasi-exponentially with the pump wavelength. As a result, the scaling law for the THz energy on the pump wavelength is nonmonotonic with the maximum at 1.6–4 μm depending on the focusing conditions.

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Nonlinear transparency window for ultraintense femtosecond laser pulses in the atmosphere

Cited by 14 publications

References 45 publications

Remote triggering of air-gap discharge by a femtosecond laser filament and postfilament at distances up to 80 m

Remote triggering of air-gap discharge by a femtosecond laser filament and postfilament at distances up to 80 m

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

Scaling Law of THz Yield from Two-Color Femtosecond Filament for Fixed Pump Power

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