Attosecond Electron Wave Packet Dynamics in Strong Laser Fields

Johnsson, Per; López-Martens, Rodrigo; Kazamias, S.; Mauritsson, Johan; Valentin, C.; Remetter, T.; Varjú, Katalin; Gaarde, Mette B.; Mairesse, Y.; Wabnitz, H.; Salieres, P.; Balcou, Philippe; Schafer, Kenneth J.; L’Huillier, Anne

doi:10.1103/physrevlett.95.013001

Cited by 114 publications

(122 citation statements)

References 28 publications

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“…For photoelectron spectroscopy and XPS this is not necessary. High harmonics are also the basis of attosecond pulses and thus of the field of attosecond physics [19,[22][23][24][25][26][27][28][29][30][31][32].…”

Section: High-harmonic Generationmentioning

confidence: 99%

Ultrafast electronic spectroscopy for chemical analysis near liquid water interfaces: concepts and applications

et al. 2009

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Electron spectroscopy for chemical analysis (ESCA) being conceptually a photoelectron spectroscopy is established as a chemically specific probe mostly for surface analysis. Liquid phase ESCA for volatile liquids has become possible through the development of the liquid microjet technique in vacuum enabling the measurement of liquid interface photoelectron emission at the high vapor pressure of volatile liquids. Recently we have been able to add the dimension of time to the liquid interface ESCA technique employing high-harmonics soft X-ray and UV/near IR femtosecond pulses in combination with liquid water micro beams in vacuum. The concepts as well as technical details are outlined and several characteristic applications are high-

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Section: High-harmonic Generationmentioning

confidence: 99%

Ultrafast electronic spectroscopy for chemical analysis near liquid water interfaces: concepts and applications

et al. 2009

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“…potential of the IR field, polarized in the same direction (y) as the XUV field, τ is the instant of ionization and e is the electron charge. This effect, which strongly depends on the initial timing 11,12 , has previously been used in attosecond metrology to determine the characteristics of single attosecond pulses 13 as well as of the IR laser field 14 .…”

mentioning

confidence: 99%

Attosecond electron wave packet interferometry

et al. 2006

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A complete quantum-mechanical description of matter and its interaction with the environment requires detailed knowledge of a number of complex parameters. In particular, information about the phase of wavefunctions is important for predicting the behaviour of atoms, molecules or larger systems. In optics, information about the evolution of the phase of light in time 1 and space 2 is obtained by interferometry. To obtain similar information for atoms and molecules, it is vital to develop analogous techniques. Here we present an interferometric method for determining the phase variation of electronic wave packets in momentum space, and demonstrate its applicability to the fundamental process of single-photon ionization. We use a sequence of extreme-ultraviolet attosecond pulses 3,4 to ionize argon atoms and an infrared laser field, which induces a momentum shear 5 between consecutive electron wave packets. The interferograms that result from the interaction of these wave packets provide useful information about their phase. This technique opens a promising new avenue for reconstructing the wavefunctions 6,7 of atoms and molecules and for following the ultrafast dynamics of electronic wave packets.

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“…The availability of APT and IAP makes it capable of performing pump-probe experiments with APT or IAP as a pump pulse and infrared (IR) laser as a probe pulse (usually written as "APT+IR" or "IAP+IR") [59][60][61]. Such experiments have the advantage that the time delay between the APT (or IAP) and the IR can be controlled with high precision at the level of attoseconds.…”

Section: Spatiotemporal Dynamics Of Laser Pulsementioning

confidence: 99%

Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium

Jin

2013

Springer Theses

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In this thesis, we establish the theoretical tools to investigate high-order harmonic generation (HHG) by intense infrared lasers in a gaseous medium. The macroscopic propagation of both the fundamental and the harmonic fields is taken into account by solving Maxwell's wave equations, while the single-atom (or single-molecule) response is obtained by quantitative rescattering theory. The initial spatial mode of the fundamental laser is assumed either a Gaussian or a truncated Bessel beam. On the examples of Ar, N 2 and CO 2 , we demonstrate that the available experimental HHG spectra with isotropic and aligned target media can be accurately reproduced theoretically even though the HHG spectra are sensitive to the experimental conditions. We show that the macroscopic HHG can be expressed as a product of a macroscopic wave packet and a photorecombination cross section, where the former depends on laser and experimental conditions while the latter is the property of the target only. The factorization makes it possible to retrieve the single-atom or single-molecule structure information from experimental HHG spectra. As for the multiple molecular orbital contribution in HHG, it causes the disappearance of the minimum in the HHG spectrum of aligned N 2 with the increase of laser intensity, and the position of minimum in HHG spectrum of aligned CO 2 depending on many factors is also attributed to it, which could explain why the minima observed in different laboratories may differ. For an important application of HHG as ultrashort light source, we show that measured continuous harmonic spectrum of Xe due to the reshaping of the fundamental laser field can be used to produce an isolated attosecond pulse by spectral and spatial filtering in the far field. For on-going application of using HHG to ionize aligned molecules, we present the photoelectron angular distribution from aligned N 2 and CO 2 in the laboratory frame, which can be compared directly with future experiments. demonstrate that the available experimental HHG spectra with isotropic and aligned target media can be accurately reproduced theoretically even though the HHG spectra are sensitive to the experimental conditions. We show that the macroscopic HHG can be expressed as a product of a macroscopic wave packet and a photorecombination cross section, where the former depends on laser and experimental conditions while the latter is the property of the target only. The factorization makes it possible to retrieve the single-atom or single-molecule structure information from experimental HHG spectra. As for the multiple molecular orbital contribution in HHG, it causes the disappearance of the minimum in the HHG spectrum of aligned N 2 with the increase of laser intensity, and the position of minimum in HHG spectrum of aligned CO 2 depending on many factors is also attributed to it, which could explain why the minima observed in different laboratories may differ. For an important application of HHG as ultrashort light source, we show that measured continu...

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Attosecond Electron Wave Packet Dynamics in Strong Laser Fields

Cited by 114 publications

References 28 publications

Ultrafast electronic spectroscopy for chemical analysis near liquid water interfaces: concepts and applications

Ultrafast electronic spectroscopy for chemical analysis near liquid water interfaces: concepts and applications

Attosecond electron wave packet interferometry

Theory of Nonlinear Propagation of High Harmonics Generated in a Gaseous Medium

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