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[PDF] Top 20 Terahertz Wave Generation in Air by Femtosecond Optical Vortex Pulses

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Terahertz Wave Generation in Air by Femtosecond Optical Vortex Pulses

Terahertz Wave Generation in Air by Femtosecond Optical Vortex Pulses

... HAL Id: hal-02327613 https://hal.archives-ouvertes.fr/hal-02327613 Submitted on 22 Oct 2019 HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether ... Voir le document complet

2

Vortex terahertz wave generation in air by femtosecond optical vortex pulses

Vortex terahertz wave generation in air by femtosecond optical vortex pulses

... of vortex generation. First SH was circularly polarized by a quarter wave plate (QWP) and converted to an optical vortex (OV) beam by an S-waveplate (RPC-405-06-557, ... Voir le document complet

11

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 THz ... Voir le document complet

6

Geometric phase shaping of terahertz vortex beams.

Geometric phase shaping of terahertz vortex beams.

... done by a fast Fourier transform. By doing so, the amplitude and phase spatial distri bution data are obtained for each ...shown in panels (a) and (b), respectively, for σ  ...the generation ... Voir le document complet

5

Energy-scalable temporal cleaning device for femtosecond laser pulses
based on cross-polarized wave generation

Energy-scalable temporal cleaning device for femtosecond laser pulses based on cross-polarized wave generation

... code in the case of the LCF laser source ...cusing in the crystal by seeding it with a divergent beam (see Subsection III C ...lower in this case, around 60%, due to air fluctuations ... Voir le document complet

10

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

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

... generated in air by bichromatic femtosecond laser pulses following the setup shown in figure 7 ...rate femtosecond Ti:sapphire chirped pulse amplification laser system ... Voir le document complet

20

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 ...THz generation [ 3 ...presented in Fig. 2(a) (red line). Since both 800 nm and 400 nm optical fields are linearly polarized ... Voir le document complet

20

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

... intensity by at least three orders of magnitude and shifts the frequency centroid down to ...plasma generation – even when it involves low electron densities ∼ 10 15−17 cm −3 – is here the key player ... Voir le document complet

3

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 multiple-frequency laser ... Voir le document complet

12

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 by ponderomotive ... Voir le document complet

8

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 radiation in the THz ... Voir le document complet

11

Self-compression of optical laser pulses by filamentation

Self-compression of optical laser pulses by filamentation

... propagation by the radius of the light filament, defined as the half width at half maximum of the fluence (time integrated intensity) ...than in the trailing part. In addition, self-focusing of the ... Voir le document complet

15

Optimal control of vortex core polarity by resonant microwave pulses

Optimal control of vortex core polarity by resonant microwave pulses

... + pulses from p = +1 to p = −1 (see ...) pulses, the p = −1 (p = +1) state is first reset using an initialization pulse whose result is known to be fully deterministic 15 ...) pulses with three ... Voir le document complet

17

Terahertz control of air lasing

Terahertz control of air lasing

... emitted in the UV spectral region after the THz and NIR pump pulse interaction (the color scale represents the intensity in log ...Data in (a) are recorded at a high NIR pump energy U1, and in ... Voir le document complet

8

Robust Quantum Dot Exciton Generation via Adiabatic Passage with Frequency-Swept Optical Pulses

Robust Quantum Dot Exciton Generation via Adiabatic Passage with Frequency-Swept Optical Pulses

... transitions in quantum dots [ 1 – 3 ]. Excitation of a two level system by a short, intense laser pulse can induce an oscillation of the system between the upper and lower state during the pulse, at the ... Voir le document complet

5

Backward lasing of singly ionized nitrogen ions pumped by femtosecond laser pulses

Backward lasing of singly ionized nitrogen ions pumped by femtosecond laser pulses

... mJ. In order to get further insight into the gas pressure dependence, we compared the intensity of the backward and forward ...increase in the pressure range below 10 mbar. In this low gas pressure ... Voir le document complet

9

Postcompression of high-energy terawatt-level femtosecond pulses and application to high-order harmonic generation

Postcompression of high-energy terawatt-level femtosecond pulses and application to high-order harmonic generation

... energy pulses by using optical-field ionization of low pres- sure helium gas in a guided ...fs pulses at TW level directly under vacuum and demonstrate a high stability of the post ... Voir le document complet

10

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

... scale. In both cases a series of equidistant peaks with decreasing ampli- tudes can be ...that in both cases the peaks are located at odd harmonics of the fundamental mode at ... Voir le document complet

5

Nanoparticle generation inside Ag-doped LBG glass by femtosecond laser irradiation

Nanoparticle generation inside Ag-doped LBG glass by femtosecond laser irradiation

... NPs. In the case of laser-modified samples, the samples were first cut and polished perpendicularly to the written ...either in terms of index profile change or of the precise localization of the ... Voir le document complet

7

Laser structuration of dielectric materials by a train of femtosecond pulses through cumulative effects

Laser structuration of dielectric materials by a train of femtosecond pulses through cumulative effects

... 2 + , which exhibits luminescence properties rendering it possible to observe their spatial distribution. Fig. 1(a) shows the emergence of a micrometric ring structure after an irradiation by 10 7 laser ... Voir le document complet

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