Time-frequency characterization of high-order harmonic pulses

López-Martens, Rodrigo; Mauritsson, Johan; Johansson, Ann; Norin, Johan; L’Huillier, Anne

doi:10.1140/epjd/e2003-00085-9

Cited by 11 publications

(2 citation statements)

References 16 publications

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“…In this second and current generation of the set up we perform HHG in a cell, focus the VUV radiation into the interaction region and use a magnetic bottle type time of flight electron spectrometer for PES. Side bands in the photoelectron spectra are used to determine the time resolution of the set up (68)(69)(70)(71)(72)(73)(74)(75)(76)(77)(78)(79).…”

Section: Introductionmentioning

confidence: 99%

Femtosecond time-resolved photoelectron spectroscopy with a vacuum-ultraviolet photon source based on laser high-order harmonic generation

Wernet

Gaudin

Godehusen

et al. 2011

Review of Scientific Instruments

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A laser-based tabletop approach to femtosecond time-resolved photoelectron spectroscopy with photons in the vacuum-ultraviolet (VUV) energy range is described. The femtosecond VUV pulses are produced by high-order harmonic generation (HHG) of an amplified femtosecond Ti:sapphire laser system. Two generations of the same set up and results from photoelectron spectroscopy in the gas phase are discussed. In both generations a toroidal grating monochromator was used to select one harmonic in the photon energy range of 20-30 eV. The first generation of the set up was used to perform photoelectron spectroscopy in the gas phase to determine the bandwidth of the source. We find that our HHG source has a bandwidth of 140±40 meV. The second and current generation is optimized for femtosecond pump-probe photoelectron spectroscopy with high flux and a small spot size at the sample of the femtosecond probe pulses. The VUV radiation is focused into the interaction region with a toroidal mirror to a spot smaller than 100 x 100 μm 2 and the flux amounts to 10 10 photons/s at the sample at a repetition rate of 1 kHz. The duration of the monochromatized VUV pulses is determined to be 120 femtoseconds resulting in an overall pump-probe time resolution of 135±5 fs. We show how this set up can be used to map the transient valence electronic structure in molecular dissociation.3

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Section: Introductionmentioning

confidence: 99%

Femtosecond time-resolved photoelectron spectroscopy with a vacuum-ultraviolet photon source based on laser high-order harmonic generation

Wernet

Gaudin

Godehusen

et al. 2011

Review of Scientific Instruments

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“…Femtosecond ionization was performed using the Ti:sapphire kilohertz laser system at the Lund Laser Center (LLC) which has been described in detail elsewhere [16,17]. Briefly, low energy, (5 nJ, 35 fs, 76 MHz) ultrashort pulses from an oscillator are stretched in time in a grating based stretcher before being amplified at 1 kHz repetition rate, in a regenerative and two Ti: sapphire multipass amplifiers, pumped by two Nd:YLF lasers, reaching energies of 4 -5 mJ.…”

Section: Methodsmentioning

confidence: 99%

Volumetric intensity dependence on the formation of molecular and atomic ions within a high intensity laser focus

Robson

Ledingham

McKenna

et al. 2005

J. Am. Soc. Mass Spectrom.

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The mechanism of atomic and molecular ionization in intense, ultra-short laser fields is a subject which continues to receive considerable attention. An inherent difficulty with techniques involving the tight focus of a laser beam is the continuous distribution of intensities contained within the focus, which can vary over several orders of magnitude. The present study adopts time of flight mass spectrometry coupled with a high intensity (8 x 10(15) Wcm(-2)), ultra-short (20 fs) pulse laser in order to investigate the ionization and dissociation of the aromatic molecule benzene-d1 (C(6)H(5)D) as a function of intensity within a focused laser beam, by scanning the laser focus in the direction of propagation, while detecting ions produced only in a "thin" slice (400 and 800 microm) of the focus. The resultant TOF mass spectra varies significantly, highlighting the dependence on the range of specific intensities accessed and their volumetric weightings on the ionization/dissociation pathways accessed.

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Laser Spectroscopy

Svanberg¹

2004

Atomic and Molecular Spectroscopy

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Time-frequency characterization of high-order harmonic pulses

Cited by 11 publications

References 16 publications

Femtosecond time-resolved photoelectron spectroscopy with a vacuum-ultraviolet photon source based on laser high-order harmonic generation

Femtosecond time-resolved photoelectron spectroscopy with a vacuum-ultraviolet photon source based on laser high-order harmonic generation

Volumetric intensity dependence on the formation of molecular and atomic ions within a high intensity laser focus

Laser Spectroscopy

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