43 Result(s)

Article

Acceleration of neutral atoms in strong short-pulse laser fields

A Nature paper of 1957 (http://go.nature.com/LDtDIb) described a force on charged particles in an inhomogeneous electric field originating from the equations...

U. Eichmann, T. Nubbemeyer, H. Rottke, W. Sandner in Nature (2009)

Article

Electron sheath dynamics and structure in intense laser driven ion acceleration

The complex dynamical behavior of the electron sheath in laser driven ion acceleration leads to variations in ion beam pointing and ion energy modulation. These processes are derived from high resolution parti...

S. Ter-Avetisyan, M. Schnürer, T. Sokollik… in The European Physical Journal Special Topi… (2009)

Chapter and Conference Paper

Towards an 100 Hz X-Ray Laser Station

During the last few years the optimization of pum** schemes of X-ray lasers (XRL) has reached a level where the required pump power could be provided by table-top or even by commercially available laser syst...

J. Tümmler, H. Stiel, R. Jung, K. A. Janulewicz, P. V. Nickles… in X-Ray Lasers 2008 (2009)

Chapter and Conference Paper

Attosecond coincidence spectroscopy of diatomic molecules

Sub-cycle ionization of Ar₂ by few-cycle laser fields is investigated with COLTRIMS. Low energy photoelectrons show clear deviations from double slit interference. We suggest that breakdown of the single-active e...

M. Lezius, Z. Ansari, M. Böttcher, B. Manschwetus, W. Sandner… in Ultrafast Phenomena XVI (2009)

Chapter

Table-Top X-Ray Lasers in Short Laser Pulse and Discharge Driven Plasmas

P. V. Nickles, K.A. Janulewicz, W. Sandner in Strong Field Laser Physics (2009)

Article

Interferometric long-term stabilization of a delay line: a tool for pump–probe photoelectron–photoion-coincidence spectroscopy on the attosecond time scale

We report a new long-term interferometric stabilization scheme for a delay line to be used for pump–probe spectroscopy on the attosecond time scale. A separate interferometer with a He–Ne laser beam is used to...

F.M. Böttcher, B. Manschwetus, H. Rottke, N. Zhavoronkov, Z. Ansari… in Applied Physics B (2008)

Article

Operation of a free-electron laser from the extreme ultraviolet to the water window

We report results on the performance of a free-electron laser operating at a wavelength of 13.7 nm where unprecedented peak and average powers for a coherent extreme-ultraviolet radiation source have been meas...

W. Ackermann, G. Asova, V. Ayvazyan, A. Azima, N. Baboi, J. Bähr… in Nature Photonics (2007)

Chapter and Conference Paper

On the Way Towards a High Repetition Rate X-Ray Laser

A way towards a high repetition rate X-ray laser (XRL) is proposed. The proposal consists of analysis of the existing pump schemes for collisional Xray lasers and their development prospects. Most of the atten...

K. A. Janulewicz, J. Tümmler, H. Stiel, W. Sandner, P.-V. Nickles… in X-Ray Lasers 2006 (2007)

Article

First operation of a free-electron laser generating GW power radiation at 32 nm wavelength

Many scientific disciplines ranging from physics, chemistry and biology to material sciences, geophysics and medical diagnostics need a powerful X-ray source with pulse lengths in the femtosecond range [1-4]...

V. Ayvazyan, N. Baboi, J. Bähr, V. Balandin… in The European Physical Journal D - Atomic, … (2006)

Chapter and Conference Paper

PHELIX — Status and First Experiments

The high-energy high-power laser system PHELIX (Petawatt High Energy Laser for heavy Ion eXperiments) [1] is currently under construction at the Gesellschaft fuer Schwerionenforschung mbH (GSI) Darmstadt. With PH...

Th. Kuehl, R. Bock, S. Borneis, E. Brambrink, H. Brand, J. Caird… in Laser 2004 (2006)

Article

Suppression of gain narrowing in multi-TW lasers with negatively and positively chirped pulse amplification

A laser scheme implementing a combination of negatively and positively chirped pulse amplification (NPCPA) is demonstrated. This method of amplification suppresses spectral narrowing typically appearing in chi...

M.P. Kalashnikov, K. Osvay, I.M. Lachko, H. Schönnagel, W. Sandner in Applied Physics B (2005)

Article

PHELIX – Status and First Experiments

The high-energy high-power laser system PHELIX (Petawatt High Energy Laser for heavy Ion eXperiments) [1] is currently under construction at the Gesellschaft fuer Schwerionenforschung mbH (GSI) Darmstadt. With PH...

Th. Kuehl, R. Bock, S. Borneis, E. Brambrink, H. Brand, J. Caird… in Hyperfine Interactions (2005)

Article

MeV – proton emission from ultrafast laser-driven microparticles

Propagation of a high intensity (∼10¹⁹ W/cm²) ultrashort (∼35 fs) laser pulse through a cloud of water spheres (150 nm diameter) results in hot electron driven proton acceleration up to 1 MeV. It is suggested tha...

M. Schnürer, S. Ter-Avetisyan, S. Busch, M.P. Kalachnikov, E. Risse… in Applied Physics B (2004)

Article

Shape of ion energy spectra in ultra-short and intense laser–matter interaction

Structured proton spectra and a two-temperature electron distribution were simulated using a 1D3V particle-in-cell code for a plasma created by 35-fs laser pulses with an intensity of I≥10¹⁹ W/cm². Such a two-tem...

S. Busch, O. Shiryaev, S. Ter-Avetisyan, M. Schnürer, P.V. Nickles… in Applied Physics B (2004)

Article

A new powerful source for coherent VUV radiation: Demonstration of exponential growth and saturation at the TTF free-electron laser

We present experimental evidence that the free-electron laser at the TESLA Test Facility has reached the maximum power gain of 10⁷ in the vacuum ultraviolet (VUV) region at wavelengths between 80 and 120 nm. At s...

V. Ayvazyan, N. Baboi, I. Bohnet… in The European Physical Journal D - Atomic, … (2002)

Article

Influence of laser pulse width on absolute EUV-yield from Xe-clusters

Using 50 fs ( ∼ 2×10¹⁸ W/cm²) and 2 ps ( ∼ 5×10¹⁶ W/cm²) pulses from a Ti:Sa multi-TW laser at 800 nm wavelength large Xe-clusters ( 10⁵...10⁶ atoms per cluster) have been excited. Absolute yield measurements of ...

M. Schnürer, S. Ter-Avetisyan, H. Stiel… in The European Physical Journal D - Atomic, … (2001)

Article

Computer Simulation of the Three-Dimensional Regime of Proton Acceleration in the Interaction of Laser Radiation with a Thin Spherical Target

Results from particle-in-cell simulations of the three-dimensional regime of proton acceleration in the interaction of laser radiation with a thin spherical target are presented. It is shown that the density o...

H. Ruhl, S. V. Bulanov, T. E. Cowan, T. V. Liseĭkina, P. Nickles… in Plasma Physics Reports (2001)

Article

X ray laser spectroscopy at the ESR: a proposed novel tool for the investigation of exotic isotopes

Novel X-ray laser sources driven by short-pulse high power lasers can provide intense beams of radiation at fixed energy. In combination with the Doppler-tuning possible at the ESR storage ring, this can be ut...

S. Borneis, B. Becker de Moos, H. J. Kluge, T. Kühl, D. Marx… in Hyperfine Interactions (2000)

Article

Microwave ionization of Rydberg states of the barium ion

We have investigated the electric field ionization of highly excited (ns) and (nd) Rydberg states of the barium ion by microwave fields. For states with a principal quantum number ...

M. Seng, U. Eichmann, V. Lange… in The European Physical Journal D - Atomic, … (1998)

Chapter

The Molecular Hydrogen B-State in an Intense Light Field

Molecular hydrogen is a preferred candidate for the investigation of excitation and decay of molecular systems in an intense light field (Zavriyev et al., 1990; Yang et al., 1991; Rottke et al., 1996; Shao et ...

H. Rottke, J. Ludwig, W. Sandner in Applications of High-Field and Short Wavelength Sources (1998)