Compression of high-energy laser pulses below 5 fs

Nisoli, M.; Silvestri, S. De; Svelto, O.; Szipöcs, R.; Ferencz, K.; Spielmann, Ch.; Sartania, S.; Krausz, Ferenc

doi:10.1364/ol.22.000522

Cited by 912 publications

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“…4512-4521, 1999-06- Highly charged molecular ions are generated in Coulomb explosion experiments involving multielectron dissociative ionization, but little is known about the precise mechanisms involved in their formation. To help improve the understanding of such experiments, potential energy curves are calculated in this paper for diatomic chlorine (Cl 2 ) and its ions Cl 2 nϩ , where nϭ1, 2,3,4,6,8,10. Bound vibrational states are obtained in three low-lying electronic states for Cl 2 2ϩ and one state for Cl 2 3ϩ .…”

Section: Nrc Publications Archive Archives Des Publications Du Cnrcmentioning

confidence: 99%

Dissociation of molecular chlorine in a Coulomb explosion: Potential curves, bound states, and deviation from Coulombic behavior forCl2n+ (n=2

et al. 1999

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Dissociation of molecular chlorine in a Coulomb Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1103/PhysRevA.59.4512Physical Review A, 59, 6, pp. 4512-4521, 1999-06- Highly charged molecular ions are generated in Coulomb explosion experiments involving multielectron dissociative ionization, but little is known about the precise mechanisms involved in their formation. To help improve the understanding of such experiments, potential energy curves are calculated in this paper for diatomic chlorine (Cl 2 ) and its ions Cl 2 nϩ , where nϭ1, 2,3,4,6,8,10. Bound vibrational states are obtained in three low-lying electronic states for Cl 2 2ϩ and one state for Cl 2 3ϩ . Vertical excitation energies are given for stepwise excitations up to Cl 2 10ϩ . For all the ions examined there is a significant energy defect (⌬) from the corresponding Coulomb potential, in one case reaching magnitudes of over 20 eV. We analyze the origin of these energy defects in terms of residual chemical bonding, and discuss the contribution of strongly bonding configurations at short internuclear distance. Finally, we present a simple physical model which describes the qualitative behavior of ⌬(R,Q).

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Section: Nrc Publications Archive Archives Des Publications Du Cnrcmentioning

confidence: 99%

Dissociation of molecular chlorine in a Coulomb explosion: Potential curves, bound states, and deviation from Coulombic behavior forCl2n+ (n=2

et al. 1999

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“…Ky, 32.80.Rm, 33.20.Xx, 32.80 Qk, 42.50 Ct The incessant development of ultrafast, femtosecond (10 −15 fs) laser technology in the infrared (IR) regime opened new avenues to study a wide range of strong-field laser matter processes at their natural time scale [1][2][3]. These invaluable experimental and technological tools allowed physicists to address instrumental aspects of one of the most fundamental processes: the tunneling ionization of atoms and molecules [3].…”

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confidence: 99%

Double-electron recombination in high-order-harmonic generation driven by spatially inhomogeneous fields

2016

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We present theoretical studies of high-order harmonic generation (HHG) driven by plasmonic fields in two-electron atomic systems. Comparing the two-active electron and single-active electron approximation models of the negative hydrogen ion atom, we provide strong evidence that a double non-sequential two-electron recombination appears to be the main responsible for the HHG cutoff extension. Our analysis is carried out by means of a reduced one-dimensional numerical integration of the two-electron time-dependent Schrödinger equation (TDSE), and on investigations of the classical electron trajectories resulting from the Newton's equation of motion. Additional comparisons between the negative hydrogen ion and the helium atom suggest that the double recombination process depends distinctly on the atomic target. Our research paves the way to the understanding of strong field processes in multi-electronic systems driven by spatially inhomogeneous fields.PACS numbers: 42.65. Ky, 32.80.Rm, 33.20.Xx, 32.80 Qk, 42.50 Ct The incessant development of ultrafast, femtosecond (10 −15 fs) laser technology in the infrared (IR) regime opened new avenues to study a wide range of strong-field laser matter processes at their natural time scale [1][2][3]. These invaluable experimental and technological tools allowed physicists to address instrumental aspects of one of the most fundamental processes: the tunneling ionization of atoms and molecules [3]. In particular, the application of this laser technology provided a key factor for the understanding of the main mechanisms underlying the emission of coherent radiation from atoms or molecules [2, 4-6].As a matter of fact, one could say the high-order harmonic generation (HHG) process fits within the tunneling ionization regime, when the Keldysh parameter, defined by γ = Ip 2Up , is γ ≤ 1. I p and U p = E 2 0 4ω 2 0 denote here the ionization potential of the atomic target, and the electron ponderomotive potential energy in atomic units, respectively. E 0 is the peak amplitude of the laser electric field and ω 0 the carrier frequency. The so-called three-step or "simple man's" picture describes the underlying physics behind the HHG phenomenon [5]. In the first step, occurring about the maximum of the strong laser electric field, the Coulomb potential is deformed in such a way that a potential barrier is formed. Then, the electron is able to tunnel out throughout this "atomic barrier", and the atom is then ionized. In the second step, or better to say phase, once the electron is in the continuum, the electric field of the laser accelerates it. Naturally, the electron gains energy from the oscillating field, converting it into a kinetic energy. Consequently, when the electric field changes its sign, the electron reverses the direction of its motion and has a certain probability to recombine back to the ground state of the remaining ion-core. In this third step it emits its energy excess as an attosecond burst of coherent radiation, typically in the XUV or EUV spectral range. In partic...

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“…Hollow-core fiber based nonlinear broadening of femtosecond pulses generated by commercial systems (Figure 4) can provide this essential ingredient [50][51][52]. Remarkably though a nearly 5-fold increase of the spectral width with respect to that achieved in the inaugural experiments of this technique is essential to achieving superoctave pulses that fulfill the requirements for sub-cycle field synthesis.…”

Section: Synthesis Of Light Fields: the Next Frontiermentioning

confidence: 99%

MAKING OPTICAL WAVES, TRACING ELECTRONS IN REAL-TIME: THE ONSET OF THE ATTOSECOND REALM (Invited Review)

Goulielmakis¹,

Krausz²

2014

PIER

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Abstract-Tracing the dynamics of electrons inside atoms molecules or solids as they occur in real time resides at the forefront of modern science and technology. Advances in attosecond physics over the last decade and beyond are now enabling this essential experimental capability. Here we discuss some of the key developments in light sciences that made possible attosecond metrology and control of electronic processes inside matter on native time scales. These developments hold the promise for new, fundamental insights into the innerworkings of the microcosm as well as the identification of innovative routes for light-based electronic and photonic devices operating at PHz rates.

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Compression of high-energy laser pulses below 5 fs

Cited by 912 publications

References 14 publications

Dissociation of molecular chlorine in a Coulomb explosion: Potential curves, bound states, and deviation from Coulombic behavior forCl2n+ (n=2

Dissociation of molecular chlorine in a Coulomb explosion: Potential curves, bound states, and deviation from Coulombic behavior forCl2n+ (n=2

Double-electron recombination in high-order-harmonic generation driven by spatially inhomogeneous fields

MAKING OPTICAL WAVES, TRACING ELECTRONS IN REAL-TIME: THE ONSET OF THE ATTOSECOND REALM (Invited Review)

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