Femtosecond Undulator Radiation from Sliced Electron Bunches

Khan, Shaukat; Holldack, K.; Kachel, T.; Mitzner, R.; Quast, T.

doi:10.1103/physrevlett.97.074801

Cited by 161 publications

(102 citation statements)

References 16 publications

(16 reference statements)

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“…In both generations of the set up, HHG is driven by a femtosecond Ti:sapphire laser system with a multipass amplifier with pulse energies of up to 2.5 mJ, a repetition rate of 1 kHz, typical pulse durations of 60 fs, and a center wavelength of 790 nm. This is the same laser system as it is used for the generation of femtosecond soft x-ray pulses at the electron storage ring BESSYII at the Helmholtz-Zentrum Berlin in the so called Femtoslicing facility (80,81) and as we used it for driving an Optical Parametric Amplifier for time-resolved mid-infrared pump and soft x-ray absorption probe spectroscopy of liquid water with BESSYII (82,83).…”

Section: Experimental Set Up I and Results: Spectral Characteristmentioning

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: Experimental Set Up I and Results: Spectral Characteristmentioning

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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“…In this regard, the recent advent of femtosecond-pulsed soft and hard X-ray sources in the form of free-electron lasers 14,15 (XFELs), synchrotron radiation femtoslicing 16,17 and high-order harmonic generation (HHG) 18 sources, has opened up the possibility of novel experiments, which combine, for the first time, femtosecond temporal and nanometre spatial resolution in an element-specific observation of ultrafast dynamics occurring in complex materials. The first time-resolved experiments relying on femtosecond X-ray sources have already led to new insight into ultrafast magnetization dynamics [19][20][21][22] .…”

mentioning

confidence: 99%

Laser-induced ultrafast demagnetization in the presence of a nanoscale magnetic domain network

et al. 2012

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Femtosecond magnetization phenomena have been challenging our understanding for over a decade. most experiments have relied on infrared femtosecond lasers, limiting the spatial resolution to a few micrometres. With the advent of femtosecond X-ray sources, nanometric resolution can now be reached, which matches key length scales in femtomagnetism such as the travelling length of excited 'hot' electrons on a femtosecond timescale. Here we study laser-induced ultrafast demagnetization in [Co/Pd] 30 multilayer films, which, for the first time, achieves a spatial resolution better than 100 nm by using femtosecond soft X-ray pulses. This allows us to follow the femtosecond demagnetization process in a magnetic system consisting of alternating nanometric domains of opposite magnetization. no modification of the magnetic structure is observed, but, in comparison with uniformly magnetized systems of similar composition, we find a significantly faster demagnetization time. We argue that this may be caused by direct transfer of spin angular momentum between neighbouring domains.

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“…They pave the way for femtosecond X-ray crystallography, albeit with a low X-ray flux and rather limited experimental applications. However this new ultra-fast science is rapidly progressing around X-ray sources such as time-slicing technique (Schoenlein et al, 2000;Khan et al, 2006;Cavalleri et al, 2006;Johnson et al, 2007) or Linac-based synchrotron (Service, 2002;Lindenberg et al, 2005;Fritz et al, 2007) and new big facility projects are underway (X-FEL). For instance one can observe the coherent atomic motions induced by a light pulse, before the thermalization of the material.…”

Section: Introductionmentioning

confidence: 99%

State of the art and opportunities in probing photoinduced phase transitions in molecular materials by conventional and picosecond X-ray diffraction

Collet¹,

Cointe²,

Lorenc³

et al. 2008

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. The optical control of the macroscopic physical properties (magnetic, optical . . .) of a material by laser irradiation is gaining interest through the emerging field of photoinduced phase transitions. Light-induced changes of the macroscopic state of a material involves subtle coupling between the electronic and structural degrees of freedom, which are essential to stabilize the photo-excited state, different in nature from the stable state. Therefore the new experimental field of photocrystallography plays a key role. It goes far beyond simple structural analysis under laser excitation. By playing on different physical parameters and developing the techniques and analysis, one can investigate new out of equilibrium physics through light-driven cooperative dynamics and transformations in materials. This paper is reviewing different aspects of the use of photocrystallography to investigate the nature, the mechanisms and the dynamics of photoinduced phase transitions for photo-steady or long-lived states, as well as transformations driven by an ultra-short light pulse. We also give a brief overview on recent advances in time-resolved crystallography with 100 ps resolution.

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Femtosecond Undulator Radiation from Sliced Electron Bunches

Abstract: At the 1.7-GeV electron storage ring BESSY II, a first source of synchrotron radiation with 100 fs pulse duration, variable (linear and circular) polarization, tunable photon energy (300 to 1400 eV), and excellent signal-to-background ratio was constructed and is now in routine operation.

Cited by 161 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

Laser-induced ultrafast demagnetization in the presence of a nanoscale magnetic domain network

State of the art and opportunities in probing photoinduced phase transitions in molecular materials by conventional and picosecond X-ray diffraction

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