Eckhart Förster
University of Jena
OpticsPhysicsBent molecular geometryIonElectronRadiationFemtosecondUltrashort pulseAtomic physicsMaterials scienceDiffractionX-raySpectroscopySpectrometerPlasma diagnosticsSpectral lineLaserCrystalPlasmaEmission spectrum
278Publications
20H-index
3,499Citations
Publications 101
Newest
#1Ulf Zastrau (FSU: University of Jena)H-Index: 27
#2Luke Fletcher (Stanford University)H-Index: 20
Last. Hae Ja Lee (Stanford University)H-Index: 22
view all 12 authors...
Source
#1Ulf Zastrau (FSU: University of Jena)H-Index: 27
#2Luke Fletcher (Stanford University)H-Index: 20
Last. Hae Ja Lee (Stanford University)H-Index: 22
view all 12 authors...
We present a cylindrically curved GaAs x-ray spectrometer with energy resolution ΔE/E = 1.1 × 10−4 and wave-number resolution of Δk/k = 3 × 10−3, allowing plasmon scattering at the resolution limits of the Linac Coherent Light Source (LCLS) x-ray free-electron laser. It spans scattering wavenumbers of 3.6 to 5.2/A in 100 separate bins, with only 0.34% wavenumber blurring. The dispersion of 0.418 eV/13.5 μm agrees with predictions within 1.3%. The reflection homogeneity over the entire wavenumber...
Source
#1V. Hilbert (Schiller International University)H-Index: 4
#2Christian Rödel (Schiller International University)H-Index: 20
Last. Ulf Zastrau (Schiller International University)H-Index: 27
view all 24 authors...
A key feature of extreme ultraviolet (XUV) radiation from free-electron lasers (FELs) is its spatial and temporal coherence. We measured the spatio-temporal coherence properties of monochromatized FEL pulses at 13.5 nm using a Michelson interferometer. A temporal coherence time of (59±8) fs has been determined, which is in good agreement with the spectral bandwidth given by the monochromator. Moreover, the spatial coherence in vertical direction amounts to about 15% of the beam diameter and abou...
Source
#1Silvio Fuchs (FSU: University of Jena)H-Index: 8
#2Christian Rödel (FSU: University of Jena)H-Index: 20
Last. Gerhard G. Paulus (FSU: University of Jena)H-Index: 61
view all 8 authors...
We present a novel method for cross sectional imaging with nanometer resolution which is referred to as XUV coherence tomography (XCT). XCT uses extreme ultra violet light (XUV), e.g., from high harmonic generation (HHG)
Source
#1Vinzenz HilbertH-Index: 7
#2Alexander BlinneH-Index: 9
Last. Ulf ZastrauH-Index: 27
view all 11 authors...
We present a Michelson interferometer for 13.5 nm soft x-ray radiation. It is characterized in a proof-of-principle experiment using synchrotron radiation, where the temporal coherence is measured to be 13 fs. The curvature of the thin-film beam splitter membrane is derived from the observed fringe pattern. The applicability of this Michelson interferometer at intense free-electron lasers is investigated, particularly with respect to radiation damage. This study highlights the potential role of ...
Source
#1Silvio Fuchs (FSU: University of Jena)H-Index: 8
#2Alexander Blinne (FSU: University of Jena)H-Index: 9
Last. Gerhard G. Paulus (FSU: University of Jena)H-Index: 61
view all 8 authors...
Optical coherence tomography (OCT) is a well-established method to retrieve three-dimensional, cross-sectional images of biological samples in a non-invasive way using near-infrared radiation. The axial resolution of OCT is in the order of the coherence length lc ∝ λ02/ΔλFWHM which depends on the central wavelength λ0 and the spectral width (FWHM) ΔλFWHM of a light source. OCT with broadband visible and near-infrared sources typically reaches axial (depth) resolutions in the order of a few micro...
Source
#1Marion HarmandH-Index: 20
#2C. D. Murphy (University of Oxford)H-Index: 38
Last. Sven ToleikisH-Index: 31
view all 30 authors...
We have developed an easy-to-use and reliable timing tool to determine the arrival time of an optical laser and a free electron laser (FEL) pulses within the jitter limitation. This timing tool can be used from XUV to X-rays and exploits high FELs intensities. It uses a shadowgraph technique where we optically (at 800 nm) image a plasma created by an intense XUV or X-ray FEL pulse on a transparent sample (glass slide) directly placed at the pump - probe sample position. It is based on the physic...
Source
#1La GizziH-Index: 21
#2S. BettiH-Index: 4
Last. I. UschmannH-Index: 17
view all 10 authors...
L.A. Gizzi,* S. Betti, E. Forster, D. Giulietti,1,2,x S. Hofer, P. Koster, L. Labate, R. Lotzsch, A. P. L. Robinson, and I. Uschmann ILIL, Istituto Nazionale di Ottica, UOS ‘‘Adriano Gozzini,’’ CNR, Via G. Moruzzi 1, Pisa, Italy INFN, Sezione di Pisa, Largo B. Pontecorvo 3, Pisa, Italy Institut fur Optik und Quantenelektronik, Friedrich-Schiller-Universitat, Max-Wien-Platz 1, 07743 Jena, Germany Central Laser Facility, Rutherford Appleton Laboratory, Chilton, OX11 0QX, United Kingdom (Received 2...
Source
#6Eckhart Förster (FSU: University of Jena)H-Index: 20
X-ray scattering using highly brilliant x-ray free-electron laser (FEL) radiation provides new access to probe free-electron density, temperature and ionization in near-solid density plasmas. First experiments at the soft x-ray FEL FLASH at DESY, Hamburg, show the capabilities of this technique. The ultrashort FEL pulses in particular can probe equilibration phenomena occurring after excitation of the plasma using ultrashort optical laser pumping. We have investigated liquid hydrogen and find th...
Source
We investigated laser-driven ion acceleration with tightl y focused femtosecond laser pulses at an intensity of 5× 10 19 W/cm 2 . Targets consisting of thin metal foils either back-coated with a µm-thick dielectric layer or uncoated have been used. The observations we report show that proton bunches with energy in the MeV range have been produced. Furthermore, the protons emitted from back-coated targets ehxibit a a spatial cross section which is remarkably more uniform and of significantly smal...
Source
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.