A single isolated sub-50 attosecond pulse generation with a two-color laser field by a frequency-chirping technique

Zhao, Kun; Chu, Tianshu

doi:10.1016/j.cplett.2011.06.005

Cited by 8 publications

(3 citation statements)

References 40 publications

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“…In the last decade and half, significant attention has been devoted to the development of attosecond science and technology, in particular, the generation of attosecond pulses and how they can be used to probe dynamics of electrons at the ever shorter timescale, for atoms, molecules, and nanostructure materials. With the development of laser technology, high-order harmonic generation (HHG) as the laser source gives access to generate XUV, soft x-ray light [1] that has available continuum bandwidth capable of supporting pulse durations of a few tens to hundreds of attoseconds [2][3][4]. These ultrafast electron dynamics serve as an important tool for detecting the dynamics inside atoms or molecules [5] and molecular orbital tomography [6].…”

Section: Introductionmentioning

confidence: 99%

Spectral splitting and phase matching of the macroscopic high-order harmonic generation in intense laser fields

Zhang

Pan

Xi-nan

et al. 2019

J. Opt.

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We theoretically investigate the macroscopic high-order harmonic generation in argon gaseous medium by numerically solving the three-dimensional macroscopic propagation equation, and the results show that the harmonic spectral and spatial profiles of harmonics are gradually splitting with the increasing of the driving laser intensity. This splitting is mainly due to the distortions which the driving field suffers during propagation and the consequence is also on phase matching. To illustrate the physical mechanisms of harmonic splitting, a theoretical analysis of the phase matching is presented. The harmonic spectra from different focus positions reveal that the split is dependent on the focus-gas-jet relative position. Moreover, we demonstrate that the spectral splitting of high harmonics can hardly be observed for neon gas jet due to the high ionization energy.

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Section: Introductionmentioning

confidence: 99%

Spectral splitting and phase matching of the macroscopic high-order harmonic generation in intense laser fields

Zhang

Pan

Xi-nan

et al. 2019

J. Opt.

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“…The production of isolated attosecond pulses can be experimentally achieved either with the technique of HHG in gas from a few-cycle driving pulse [10,11] or with the technique of temporal confinement of the HHG by polarization gating [12]. Moreover, theoretically, the two-colour control mechanisms [13][14][15][16], the coherent superposition state of the target technique [17][18][19] and the frequency-chirping method [20][21][22][23][24][25][26][27][28], have been introduced. To have easy way to create and control a focused wavepacket of the laser field, we employ the frequencychirping of driving laser pulse method this in article.…”

Section: Introductionmentioning

confidence: 99%

Electron path control of high-order harmonic generation by a spatially inhomogeneous field

Mohebbi

Malaei

2015

Journal of Modern Optics

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We theoretically investigate the control of high-order harmonics cut-off and as-pulse generation by a chirped laser field using a metallic bow tie-shaped nanostructure. The numerical results show that the trajectories of the electron wave packet are strongly modified, the short quantum path is enhanced, the long quantum path is suppressed and the low modulated spectrum of the harmonics can be remarkably extended. Our calculated results also show that, by confining electron motion, a broadband supercontinuum with the width of 1670 eV can be produced which directly generates an isolated 34 as-pulse without phase compensation. To explore the underlying mechanism responsible for the cut-off extension and the quantum path selection, we perform time-frequency analysis and a classical simulation based on the three-step model.

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“…As contrast to the attosecond pulse train, an isolated attosecond pulse, especially the one close to one atomic unit (i. e., ~24 as), is more benefit for measuring and controlling the ultrafast electronic dynamics inside the atoms, such as the inner-shell electronic relaxation and ionization by optical tunneling [4,15]. Hence, a series of methods have been proposed to generate the isolated attosecond pulses with multi-cycle laser pulses, such as two-color scheme [10,12,[16][17][18], the chirped control method [19][20][21][22], the polarization gating method [7,[23][24][25][26]. Recently, when a chirped control pulse combined with the polarization gating pulses interacts with the gas, an isolated ~70 attosecond pulse is filtered out from the supercontinuum spectrum [27,28].…”

mentioning

confidence: 99%

Generation of isolated attosecond pulses of sub-atomic-time durations with multi-cycle chirped polarization gating pulses

Zhang¹,

Yao²,

Ni³

2012

Opt. Express

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Abstract:We theoretically investigate the X-ray supercontinuum generated by interaction of multi-cycle, chirped polarization gating pulses with the helium gas. It is shown that with this scheme, an isolated sub-50-attosecond pulse can be obtained straightforwardly without any phase compensation. Interestingly, if one selects an extremely broad spectral range near the highorder harmonic cutoff, an isolated and intense sub-24-attosecond pulse can be generated after phase compensation, which could be used to detect and control the electronic dynamics inside the atoms. Furthermore, it is found that the generation of such a broad and smooth X-ray supercontinuum is not so stringent on the selection of the simulated parameters, allowing for the experimental demonstration of this technique in the future.

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A single isolated sub-50 attosecond pulse generation with a two-color laser field by a frequency-chirping technique

Cited by 8 publications

References 40 publications

Spectral splitting and phase matching of the macroscopic high-order harmonic generation in intense laser fields

Spectral splitting and phase matching of the macroscopic high-order harmonic generation in intense laser fields

Electron path control of high-order harmonic generation by a spatially inhomogeneous field

Generation of isolated attosecond pulses of sub-atomic-time durations with multi-cycle chirped polarization gating pulses

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