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Haut PDF Intensity modulated terahertz vortex wave generation in air plasma by two-color femtosecond laser pulses

Haut PDF Intensity modulated terahertz vortex wave generation in air plasma by two-color femtosecond laser pulses ont été compilés par 123dok FR

Intensity modulated terahertz vortex wave generation in air plasma by two-color femtosecond laser pulses

Intensity modulated terahertz vortex wave generation in air plasma by two-color femtosecond laser pulses

... generated in air plasma by focused bichromatic femtosecond laser pulses, when one of the pump beams (second harmonic) is an optical ...singularity in the generated ... Voir le document complet

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Terahertz Radiation Source in Air Based on Bifilamentation of Femtosecond Laser Pulses

Terahertz Radiation Source in Air Based on Bifilamentation of Femtosecond Laser Pulses

... THz generation in a stratified plasma It has been predicted that a short laser pulse propagating in a periodically varying (stratified) plasma can generate electromagnetic ... Voir le document complet

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Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape

Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape

... ultrashort terahertz (THz) pulses can be produced using plasma generation in a noble gas ionized by femtosecond two-color ...that, by using ... Voir le document complet

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Spectral dynamics of THz pulses generated by two-color laser filaments in air: the role of Kerr nonlinearities and pump wavelength

Spectral dynamics of THz pulses generated by two-color laser filaments in air: the role of Kerr nonlinearities and pump wavelength

... delayed) in filament-driven THz pulse ...THz generation process over long propagation distances, even in intensity regimes where the photocurrent mechanism is the dominating THz ...source. ... Voir le document complet

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Broadband terahertz radiation from two-color mid- and far-infrared laser filaments in air

Broadband terahertz radiation from two-color mid- and far-infrared laser filaments in air

... photocurrents in laser-driven THz pulse generation ...the plasma terms. The presence of plasma clearly enlarges the spectra by about 3 orders of magnitude and shifts the peak ... Voir le document complet

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Impact of the pump wavelength in THz emissions by two-color femtosecond laser filaments in air

Impact of the pump wavelength in THz emissions by two-color femtosecond laser filaments in air

... supercontinuum generation to lightning control [1]. In air, femtosecond filaments result from the self-focusing of ultrashort light pulses that couple to their own plasma channel ... Voir le document complet

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THz field engineering in two-color femtosecond filaments using chirped and delayed laser pulses

THz field engineering in two-color femtosecond filaments using chirped and delayed laser pulses

... Introduction Terahertz (THz) time-domain spectroscopy is a promising way to analyze various complex materials, the molecular transitions of which possess unique fingerprints in this spectral range [ 1 – 3 ... Voir le document complet

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Coherent control of boosted terahertz radiation from air plasma pumped by femtosecond three-color sawtooth field

Coherent control of boosted terahertz radiation from air plasma pumped by femtosecond three-color sawtooth field

... obtained by two-color and three-color sawtooth wave ...the two-color case, the insertion of the fused silica wedge was optimized for the most intense THz generation ... Voir le document complet

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Terahertz pulse generation by two-color laser fields with circular polarization

Terahertz pulse generation by two-color laser fields with circular polarization

... (LP) pulses with orthogonally-polarized colors ...only pulses being linearly polarized underwent a strong dependency on the relative phase ...numerically. In [ 40 ] the influence of ... Voir le document complet

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THz Emissions from Air-Plasmas Created by Mid-and Far-Infrared Two-Color Femtosecond Pulses

THz Emissions from Air-Plasmas Created by Mid-and Far-Infrared Two-Color Femtosecond Pulses

... the plasma terms before the linear focus. The presence of plasma clearly increases the THz spectral intensity by at least three orders of magnitude and shifts the frequency centroid down to ... Voir le document complet

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Terahertz spectroscopy from air plasmas created by two-color femtosecond laser pulses: The ALTESSE project

Terahertz spectroscopy from air plasmas created by two-color femtosecond laser pulses: The ALTESSE project

... waves by intense two- color laser pulses, distributed according to the optical ...photoionization in the tunnel regime (photocurrents) and involves plasma waves created ... Voir le document complet

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Vortex terahertz wave generation in air by femtosecond optical vortex pulses

Vortex terahertz wave generation in air by femtosecond optical vortex pulses

... show intensity distribution of the generated THz beam at specified energy ...levels. Two rightmost columns additionally show spectral maps with original (non-normalized) scale (‘original values’) and ... Voir le document complet

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Confined longitudinal acoustic phonon modes in free-standing Si membranes coherently excited by femtosecond laser pulses

Confined longitudinal acoustic phonon modes in free-standing Si membranes coherently excited by femtosecond laser pulses

... stabilized in order to fix the difference of the rep- etition rates at ⌬f rep = 10 ...ns兲 by the probe pulse in ⌬f rep −1 = 100 ␮ s without mechanical delay ...achieved by this technique lies ... Voir le document complet

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Amplification of transition-Cherenkov terahertz radiation of femtosecond filament in air

Amplification of transition-Cherenkov terahertz radiation of femtosecond filament in air

... driven by the ponderomotive force and the external ...the plasma filament L has to be replaced by the distance D between the ...electrodes. In order to verify the dependence on the filament ... Voir le document complet

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Spatially controlled nano-structuring of silicon with femtosecond vortex pulses

Spatially controlled nano-structuring of silicon with femtosecond vortex pulses

... polarization in the beam transverse plane. They may possess phase singularities in the transverse plane at which the field amplitude ...expanded in terms of orbital angular momentum (OAM) carrying, ... Voir le document complet

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en fr Glass on glass welding by femtosecond laser pulses Assemblage de verre sur verre par impulsions laser femtosecondes

... faisceau laser dans le matériau, avec des triangles de dimensions maximales de 0,2 µm autour de l’axe, et de dimensions maximales de 32 µm aux extrémités de la ...impulsion laser et après diffusion de la ... Voir le document complet

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Spatially controlled nano-structuring of silicon with femtosecond vortex pulses

Spatially controlled nano-structuring of silicon with femtosecond vortex pulses

... the vortex pulses on to a crystalline (100) p-type silicon mounted on a precision 3-axis (x, y, z) motion control ...the laser focus relative to the sample's surface was determined accurately (±5 μm) ... Voir le document complet

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Resonant Effects in Terahertz Generation with Laser-Induced Gas Plasmas

Resonant Effects in Terahertz Generation with Laser-Induced Gas Plasmas

... gas plasma produced by the fs laser pulse is a finite conducting structure with a lifetime largely exceeding the fs time ...gas plasma features plasmonic resonances which may have a strong ... Voir le document complet

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Impact of the pulse contrast ratio on molybdenum Kα generation by ultrahigh intensity femtosecond laser solid interaction

Impact of the pulse contrast ratio on molybdenum Kα generation by ultrahigh intensity femtosecond laser solid interaction

... during laser-target interaction. It is positioned perpen- dicular to the laser beam and as close as possible to the OAP to minimize the development of nonlinear ...maximum intensity used in ... Voir le document complet

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Amorphization in crystalline tellurium by femtosecond pulses

Amorphization in crystalline tellurium by femtosecond pulses

... shown in Fig. 1(b). Secondly, we excited the sample with two identical but weaker pump ...the two pumps were separated by 100 ps, which is sufficient for the majority of excited carriers near ... Voir le document complet

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