Generating coherent broadband continuum soft-x-ray radiation by attosecond ionization gating

Pfeifer, Thomas; Jullien, Aurélie; Abel, Mark J.; Nagel, Phillip M.; Gallmann, L.; Neumark, Daniel M.; Leone, Stephen R.

doi:10.1364/oe.15.017120

Cited by 69 publications

(52 citation statements)

References 14 publications

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“…Therefore, by measuring the HCO energies generated by an unknown laser waveform for a range of CEP values, from Eq. (7), the envelope of the vector potential, and hence of the electric field, can be reconstructed [43,44] so long as the central frequency 3 0 is known, as illustrated in Fig. 3.…”

Section: Half-cycle Cut-offs In Single Atom Hhg Spectramentioning

confidence: 99%

“…This can be achieved by fitting the set of generated HCO energies to a library of calculated ones, enabling the determination of the intensity, CEP and chirp of the laser field to be retrieved from a single measurement [37]. This process, and that of [43,44], will be discussed in more detail in Sect. 5.1.…”

Section: Half-cycle Cut-offs In Single Atom Hhg Spectramentioning

confidence: 99%

“…Given the central frequency of the driving laser field, this can be used to determine the timescale of the portion measured and the envelope of the electric field during this time. The complete field envelope can then be found by fitting it to these measured values, as reported in [43,44], see Fig. 17.…”

Section: Reconstructing the Laser Fieldmentioning

confidence: 99%

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The generation and utilisation of half‐cycle cut‐offs in high harmonic spectra

Chipperfield

Robinson

Knight

et al. 2009

Laser & Photonics Reviews

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High-order harmonic spectra are composed of a coherent sum of half-cycle emissions, the cut-off energy of which depend sensitively on different sub-cycle portions of the driving laser field. By selecting the correct focal geometry the half-cycle cut-off emissions can be preferentially selected over the lower energy plateau emissions through phase matching, such that they form macroscopic half-cycle cut-off features in the far-field spectrum. The energy of these macroscopic half-cycle cut-offs can then be used to retrieve the waveform of the driving laser field. The processes through which these macroscopic half-cycle cut-offs are formed and their applications, both for measuring the laser waveform and the generation of wavelength tunable isolated attosecond pulses, are reviewed in detail.A wavelet transform of the simulated on-axis harmonic field generated by an atomic gas jet driven by an intense few-cycle laser pulse. The focal geometry has been selected to only phase match the half-cycle cut-offs. The energies of these half-cycle cut-offs form a "fingerprint" of the laser field, which can be used to determine important properties of the field waveform.

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Section: Half-cycle Cut-offs In Single Atom Hhg Spectramentioning

confidence: 99%

Section: Half-cycle Cut-offs In Single Atom Hhg Spectramentioning

confidence: 99%

See 1 more Smart Citation

The generation and utilisation of half‐cycle cut‐offs in high harmonic spectra

Chipperfield

Robinson

Knight

et al. 2009

Laser & Photonics Reviews

View full text Add to dashboard Cite

show abstract

“…This phenomenon has a wide range of applications, such as coherent light sources in the extreme ultraviolet [2][3][4] and soft x-ray [5][6][7] frequency range, attosecond (10 −18 s) pulse generation [8][9][10], and attosecond molecular imaging [11,12]. HHG can be explained by means of the well-known semi-classical three-step model [13][14][15][16] or equally well by the fully quantum version given by Lewenstein et al [17].…”

Section: Introductionmentioning

confidence: 99%

Coupled-coherent-states approach for high-order harmonic generation

Symonds

Rontó

et al. 2015

Phys. Rev. A

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In this paper we report a version of the Coupled Coherent States (CCS) method which is able to accurately compute the HHG spectrum of an electron in a laser field in one dimension by the use of trajectory-guided grids of Gaussian wavepackets. It is shown that by periodic re-projection of the wavefunction and dynamically altering the basis set size, the method can account for a wavefunction which spreads out to cover a large area in phase space while still keeping computational expense low. The HHG spectra obtained show good agreement with those from a time dependent Schrödinger equation solver. We show also that the part of the wavefunction which is responsible for HHG moves along a periodic orbit which is far from that of classical motion. Although this paper is a proof of principle and therefore focussed on a simple one-dimensional system, future generalisations for the multi-electron case are discussed.

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“…High-order harmonic generation (HHG) from atoms and molecules is one of the most important strong-field processes because it serves not only a source of coherent ultrashort radiation in the extreme ultraviolet and soft X-ray regions but also a sensitive detector of attosecond processes in the atomic or molecular media [1][2][3][4][5][6][7][8][9][10]. The physics of HHG from atoms is well explained by the quasiclassical three-step model [11]: an electron in atom is ionized by a strong laser field.…”

Section: Introductionmentioning

confidence: 99%

Quantum path interferences of electron trajectories in two-center molecules

Yang¹,

Xia²,

Zhang³

et al. 2010

Opt. Express

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Abstract:We report a new quantum path interference effect of electron trajectories in high-order harmonic generation (HHG) from two-center molecules, in which the interference minima are mainly located in the highenergy portion of HHG spectrum. The quantum calculations of the timefrequency analyses and the classical results of the electron trajectories demonstrate very good agreement and reveal that the positions of the interference minima are associated with the cutoff of various kinds of molecular electron trajectories. The interference fringes within a half optical cycle can be clearly seen in the time-frequency analysis spectrum. Moreover, the characteristics of both the HHG in frequency domain and the corresponding attosecond pulse generation in time domain permit tracing back the interference information of these electron trajectories. These interference phenomena offer new possibilities for getting insight into the attosecond electronic dynamics in molecules. Gallmann, P. Salières, and U. Keller, "Ionization effects on spectral signatures of quantum-path interference in high-harmonic generation," Opt. Express 17(7), 5716-5722 (2009). 10. C. Winterfeldt, C. Spielmann, and G. Gerber, "Optimal control of high-harmonic generation," Rev. Mod. Phys. 117-140 (2008). 11. P. B. Corkum, "Plasma perspective on strong field multiphoton ionization," Phys. Rev. Lett. 71(13), 1994-1997 (1993). 12. P. B. Corkum, and F. Krausz, "Attosecond science," Nat. Phys. 3(6), 381-387 (2007 ©2010 Optical Society of America 80(1),

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Generating coherent broadband continuum soft-x-ray radiation by attosecond ionization gating

Cited by 69 publications

References 14 publications

The generation and utilisation of half‐cycle cut‐offs in high harmonic spectra

The generation and utilisation of half‐cycle cut‐offs in high harmonic spectra

Coupled-coherent-states approach for high-order harmonic generation

Quantum path interferences of electron trajectories in two-center molecules

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