Role of Rotational Wave Packets in Strong Field Experiments

Weber, Sébastien J.; Oppermann, Malte; Marangos, J. P.

doi:10.1103/physrevlett.111.263601

Cited by 31 publications

(26 citation statements)

References 24 publications

(33 reference statements)

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“…1) and generating (beam no. 2) beams (details of the calculation can be found in Weber et al 41 ). The temporal evolution of S(ω,t) is reflecting the shape evolution of ρ angularly filtered by the harmonic dipole response.…”

Section: A Hhg Spectroscopymentioning

confidence: 99%

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Flexible attosecond beamline for high harmonic spectroscopy and XUV/near-IR pump probe experiments requiring long acquisition times

Weber

Manschwetus

Billon

et al. 2015

Review of Scientific Instruments

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We describe the versatile features of the attosecond beamline recently installed at CEA-Saclay on the PLFA kHz laser. It combines a fine and very complete set of diagnostics enabling high harmonic spectroscopy (HHS) through the advanced characterization of the amplitude, phase, and polarization of the harmonic emission. It also allows a variety of photo-ionization experiments using magnetic bottle and COLTRIMS (COLd Target Recoil Ion Momentum Microscopy) electron spectrometers that may be used simultaneously, thanks to a two-foci configuration. Using both passive and active stabilization, special care was paid to the long term stability of the system to allow, using both experimental approaches, time resolved studies with attosecond precision, typically over several hours of acquisition times. As an illustration, applications to multi-orbital HHS and electron-ion coincidence time resolved spectroscopy are presented.

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Section: A Hhg Spectroscopymentioning

confidence: 99%

“…1, is frequently used to prepare an aligned molecular sample through non-adiabatic alignment. [39][40][41] In that case, up to 2 mJ is used in a non-collinear geometry with the beam polarization controlled by a motorized halfwave plate. A motorized delay stage sets the delay with respect to the other beams.…”

Section: A Optical Setup and High Harmonic Generationmentioning

confidence: 99%

Flexible attosecond beamline for high harmonic spectroscopy and XUV/near-IR pump probe experiments requiring long acquisition times

Weber

Manschwetus

Billon

et al. 2015

Review of Scientific Instruments

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“…Harmonic generation can serve this goal. It has b een shown theoretically [33][34][35][36][37] and experimentally [38,39] that high-order harmonic spectra generat ed from aligned molecules carry information about higher-order cosine moments. The time dependence of the harmonic amplitude can be generally described by a series of direction cosines product s governing the dynamical alignment .…”

Section: Figure 3 Presents T He Calculated Mean Values (Cos(2n8))mentioning

confidence: 99%

Experimental observation of fractional echoes

et al. 2016

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We report the observation of fractional echoes in a double-pulse excited nonlinear syst em . Unlike standard echoes which appear p eriodically at delays which are integer multiple of the delay between the two exciting pulses, the fractional echoes appear at rational fractions of this delay. We discuss the mechanism leading to this phenomenon, and provide the first experimental demonstration of fractional echoes by measuring third harmonic generation in a thermal gas of C02 molecules excited by a pair of femtosecond laser pulses . 37.10.Vz, 42. 50. Md Many nonlinear syst ems display the phenomenon of echoes, which is a series of delayed impulsive responses after a pair of short external pulses . These echoes typ-· icany show themselves at times T rv T , 2T, 3T, etc. after the end of the excitation, where T is the delay between the stimulating pulses . Echoes are common in many ar-· eas of physics, including NMR [1] , plasma physics [2--4], nonlinear optics [5], cavity quantum electrodynam-· ics [6 , 7], and cold atoms physics [8][9][10][11] . Echoes were predict ed to occur in proton storage rings [12 , 13], and were observed in high energy hadron b eam experiments [14,15] . Echo-enabled generation of short-wavelength ra-· diation in free-electron lasers [16][17][18] was demonstrat ed (for a recent review, see [19]) .Recently we reported the exist ence of orienta-· tion/ alignment echoes in an ensemble of free classi-· cal rotors stimulat ed by an external impulsive force [20] . We attributed t he echo formation to the kick-· induced filamentation of the rotational ph ase space, and demonstrated the effect experimentally in a gas of C0 2 molecules excited by a pair of femtosecond laser pulses. The time-dependent mean molecular alignment (defined as (cos 2 (B) )(t) , where e is the angle between t he molec-· ular axis and laser polarization) was measured via the laser-induced birefringence signaL The excited syst em exhibited a regular sequence of echo pulses at delays T = T , 2T, 3T, . . . . In addition, our theoretical analysis and numerical simulations [20] also predict ed unusual ad-· ditional recurrences (fractional echoes) at T = (p j q)T, where p and q are mutuany prime numbers. These frac-· tional echoes, however cannot be seen in the alignment signal -t hey require measurement of higher order mo-· ments of the molecular angular distribution.Here we present the first observation of the phe-· nomenon of fractional echoes measured via third-· harmonic generation (THG) in a gas of C0 2 molecules at room t emperature and pressure of 80 mbar. In what follows we introduce the mechanism of the fractional echoes by using a simple 2D classical model, and then describe our experiments in which t he phenomenon of fractional echoes was observed . We also compare the experimental result s to the fun three-dimensional classical and quantum simulations of the echo formation .For a nonresonant laser field interacting with a symmetric linear molecule, such as N 2 , 0 2 or C0 2 , the angular-dependent interaction potent...

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“…Experiments in aligned molecules [115,125,143,144] investigated the rotational excitation dynamics of O 2 , CO 2 and N 2 in a pump-probe scheme as well. The harmonic intensity dependence on the delay between the alignment pulse (pump) and the high harmonics generating pulse (probe) reproduced the characteristic patterns of the rotational revivals.…”

Section: Nuclear and Electronic Dynamics Resolved Via High Harmonic Gmentioning

confidence: 99%

Multidimensional high harmonic spectroscopy

Serbinenko

Smirnova

2013

2013 Conference on Lasers &Amp; Electro-Optics Europe &Amp; International Quantum Electronics Conference CLEO EUROPE/IQEC

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Multidimensional high harmonic spectroscopy is a cutting-edge technique for studying the effect of the intense low-frequency laser fields on atoms and molecules. The high energy photons, emitted by a particle as a result of the interaction with the strong laser field, carry the information about the processes in atoms and molecules, which lead to the emission. Multidimensional character of the technique allows to extract parameters of the molecular and atomic ionization dynamics, that were inaccessible before in the same experiment, such as sub-cycle ionization rates, ionization and recombination times.The Thesis presents in detail theoretical analysis of the multidimensional high harmonic generation process within semi-classical approach. Several generating field configurations are considered. The developed theoretical apparatus is then applied to describe multidimensional high harmonic spectroscopy experiments in helium. Initial analysis of the applicability of the technique for the study of multielectron dynamics in carbon dioxide is also performed.The problems, solutions to which are presented in the Thesis, are:• theoretical description of high harmonic generation in multicolor fields• analysis of the gating techniques for the extraction of the parameters of electron trajectories in high harmonic generation in He• proposition of an alternative reconstruction procedure of electron trajectory parameters, that allows one to access to all of them simultaneouslyThe main results of our work are:• Based on theoretical analysis of multidimensional high harmonic generation, we showed, that optimization of the two-dimensional harmonic 3 signal is achieved at each step of the process: ionization, propagation, dynamics in the ion and recombination• We demonstrated, that multidimensional high harmonic spectroscopy is a very sensitive tool allowing one to extract parameters of electron trajectories, such as complex ionization time and complex electron momentum, from the observed harmonic signal• We developed and applied theory to the analysis of two-color high harmonic generation experiments of He atom• We performed initial analysis of two-color HHG experiments in carbon dioxide, which was necessary for further investigation and reconstruction I thank Bettina Becker, the most helpful person in the institute or in the whole world, who made the bureaucratic problems very easy. There was no question she didn't answer and no problem she didn't solve quickly and efficiently.

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Role of Rotational Wave Packets in Strong Field Experiments

Cited by 31 publications

References 24 publications

Flexible attosecond beamline for high harmonic spectroscopy and XUV/near-IR pump probe experiments requiring long acquisition times

Flexible attosecond beamline for high harmonic spectroscopy and XUV/near-IR pump probe experiments requiring long acquisition times

Experimental observation of fractional echoes

Multidimensional high harmonic spectroscopy

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