Continuous spectra in high-harmonic generation driven by multicycle laser pulses

Holgado, Warein; Hernández-García, Carlos; Alonso, Benjamín González; Miranda, Miguel; Silva, F.; Plaja, Luis; Crespo, Helder; Sola, Íñigo J.

doi:10.1103/physreva.93.013816

Cited by 14 publications

(22 citation statements)

References 45 publications

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“…Due to the different sign of the driving electric field at each half-cycle, consecutive attosecond pulses are emitted with a global π-phase difference that results in the emission of odd-order harmonics. If the phase relation between consecutive attosecond pulses is different from π, additional spectral contributions are found [24-26], even producing a XUV continuum [44]. The results presented in Fig.…”

Section: Insensitivity Of the Relative Phase Between Attosecond Pulsementioning

confidence: 95%

Carrier-envelope-phase insensitivity in high-order harmonic generation driven by few-cycle laser pulses

Hernández-García¹,

Holgado²,

Plaja³

et al. 2015

Opt. Express

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We present evidence for self-stabilization of the relative spectral phase of high-order harmonic emission against intensity variations of the driving field. Our results demonstrate that, near the laser focus, phase matching of the harmonic field from a macroscopic target can compensate for the intensity dependence of the intrinsic phase of the harmonics emitted by a single radiator. As a consequence, we show experimentally and theoretically the insensitivity of the harmonic spectra produced at the laser focus against variations of the carrier-envelope phase (CEP) of a sub-two-cycle driving field. In addition, the associated attosecond pulse trains exhibit phase locking against CEP changes of the few-cycle driver.

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Section: Insensitivity Of the Relative Phase Between Attosecond Pulsementioning

confidence: 95%

Carrier-envelope-phase insensitivity in high-order harmonic generation driven by few-cycle laser pulses

Hernández-García¹,

Holgado²,

Plaja³

et al. 2015

Opt. Express

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“…With a N-BAF10 lens and a SF10 lens, Eqs. (27) with γ(0) = +1 give f 1 = 589.2 mm and f 2 = −867.9 mm, and the total focal length with zero separation is f = 184.5 cm. From Eq.…”

Section: Implementation Of Tunable Chromatic Aberration For Cep Mmentioning

confidence: 99%

Three-dimensional carrier-envelope-phase map of focused few-cycle pulsed Gaussian beams

2018

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We derive an analytical expression that describes the complete three-dimensional carrier-envelope phase (CEP) distribution of in the focal volume of ultrashort pulsed Gaussian beams focused by spherical mirrors or lenses. The focal CEP map depends on the so-called factor g specifying the frequency-dependence of the beam width of the source few-cycle pulse, on its chirp and on the small chromatic aberration introduced by a lens without appreciably distorting or broadening the few-cycle pulse. We show how to tailor the CEP map of mirror-focused and lens-focused few-cycle pulses in order to produce negligible transversal and axial CEP variations in specific regions of the focal volume for phase-sensitive interactions of light with matter taking place in a volume or on a surface. We propose a quasi-achromatic doublet lens that can implement in practice these tailored CEP distributions.

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“…In the present experiments, this allowed us to confirm that the maximum HHG yield occurs for the wedge insertion that indeed gives the shortest and more intense pulse on target-defined as the "zero" glass insertion in Figs. 2(b) and 2(c)-but this capability is also particularly relevant for coherent control of HHG and other strong-field processes employing shaped (e.g., chirped [53,54]) laser pulses.…”

Section: Resultsmentioning

confidence: 99%

In situ temporal measurement of ultrashort laser pulses at full power during high-intensity laser–matter interactions

Crespo

Witting

Canhota

et al. 2020

Optica

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In laser-matter interaction experiments, it is of paramount importance to characterize the laser pulse on target (in situ) and at full power. This allows pulse optimization and meaningful comparison with theory, and it can shed fundamental new light on pulse distortions occurring in or on the target. Here we introduce and demonstrate a new technique based on dispersion-scan using the concurrent third harmonic emission from the target that permits the full (amplitude and phase), in situ, in-parallel characterization of ultrashort laser pulses in a gas or solid target over a very wide intensity range encompassing the 10 13-10 15 Wcm −2 regime of high harmonic generation and other important strong-field phenomena, with possible extension to relativistic intensities presently inaccessible to other diagnostics. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Continuous spectra in high-harmonic generation driven by multicycle laser pulses

Cited by 14 publications

References 45 publications

Carrier-envelope-phase insensitivity in high-order harmonic generation driven by few-cycle laser pulses

Carrier-envelope-phase insensitivity in high-order harmonic generation driven by few-cycle laser pulses

Three-dimensional carrier-envelope-phase map of focused few-cycle pulsed Gaussian beams

In situ temporal measurement of ultrashort laser pulses at full power during high-intensity laser–matter interactions

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