FS-FLASH-B

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2017-07-25
10:57
DBCoverage [PUBDB-2017-08413] Journal Article
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Single-shot determination of focused FEL wave fields using iterative phase retrieval
Optics express 25(15), 17892 - 17903 (2017) [10.1364/OE.25.017892]  GO
ddc:530
Determining fluctuations in focus properties is essential for many experiments at Self-Amplified-Spontaneous-Emission (SASE) based Free-Electron-Lasers (FELs), in particular for imaging single non-crystalline biological particles. We report on a diffractive imaging technique to fully characterize highly focused, single-shot pulses using an iterative phase retrieval algorithm, and benchmark it against an existing Hartmann wavefront sensor. [...]
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2017-06-23
10:06
OpenAccess [PUBDB-2017-05924] Journal Article
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Statistical properties of a free-electron laser revealed by Hanbury Brown?Twiss interferometry
ddc:530
We present a comprehensive experimental analysis of statistical properties of the self-amplified spontaneous emission free-electron laser (FEL) FLASH by means of Hanbury Brown and Twiss interferometry. The experiments were performed at FEL wavelengths of 5.5, 13.4, and 20.8 nm [...]
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2017-05-12
11:45
OpenAccess [PUBDB-2017-02744] Journal Article
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Attosecond Interferometry with Self-Amplified Spontaneous Emission of a free-electron laser
ddc:500
Light-phase-sensitive techniques, such as coherent multidimensional spectroscopy, are well-established in a broad spectral range, already spanning from radio-frequencies in nuclear magnetic resonance spectroscopy to visible and ultraviolet wavelengths in nonlinear optics with table-top lasers. In these cases, the ability to tailor the phases of electromagnetic waves with high precision is essential [...]
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2017-04-03
10:09
OpenAccess [PUBDB-2017-01521] Journal Article
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Optimization and Characterization of High-Harmonic Generation for Probing Solid Density Plasmas
ddc:530
The creation of high energy density plasma states produced during laser–solid interaction on a sub-picosecond timescale opens a way to create astrophysical plasmas in the lab to investigate their properties, such as the frequency-dependent refractive index. Available probes to measure absorption and phase-changes given by the complex refractive index of the plasma state are extreme-UV (EUV) and soft X-ray (XUV) ultra-short pulses from high harmonic generation (HHG). [...]
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2017-03-14
18:36
OpenAccess [PUBDB-2017-01374] Internal Report
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Quantum Imaging with Incoherently Scattered Light from a Free-Electron Laser
The advent of accelerator-driven x-ray free-electron lasers (FEL) has opened new avenues for high-resolution structure determination via diffraction methods that go far beyond conventional x-ray crystallography methods. These techniques rely on coherent scattering processes that require the maintenance of first-order coherence of the radiation field throughout the imaging procedure. [...]
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2017-02-02
05:37
OpenAccess [PUBDB-2017-00830] Journal Article
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Correlated electronic decay in expanding clusters triggered by intense XUV pulses from a Free-Electron-Laser
ddc:000
Irradiation of nanoscale clusters and large molecules with intense laser pulses transforms them into highly-excited non- equilibrium states. The dynamics of intense laser-cluster interaction is encoded in electron kinetic energy spectra, which contain signatures of direct photoelectron emission as well as emission of thermalized nanoplasma electrons. [...]
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2017-01-09
12:38
OpenAccess [PUBDB-2017-00305] Journal Article
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PhotonDiag2015 workshop: introductory overview
ddc:540
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2016-11-17
10:54
[PUBDB-2016-05321] Conference Presentation (After Call)
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Terahertz Radiation Driven Dynamics of Magnetic DomainStructures Probed by Free-Electron Laser Light
61st Annual Conference on Magnetism and Magnetic Materials, MMM, Meeting locationNew Orleans, USA, 31 Oct 2016 - 4 Nov 20162016-10-312016-11-04
Controlling magnetism on ultra-fast time scales and on nanometer lengthscales is a challenge for modern research in magnetism. Means for inducingdynamics on these time scales are femtosecond optical lasers [1] and THzsources [2]. [...]

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2016-08-22
10:42
OpenAccess [PUBDB-2016-03283] Journal Article
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High-Field High-Repetition-Rate Sources for the Coherent THz Control of Matter
ddc:000
Ultrashort flashes of THz light with low photon energies of a few meV, but strong electric or magneticfield transients have recently been employed to prepare various fascinating nonequilibrium statesin matter. Here we present a new class of sources based on superradiant enhancement of radiationfrom relativistic electron bunches in a compact electron accelerator that we believe will revolutionizeexperiments in this field. [...]
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2012-09-19
19:21
OpenAccess [PHPPUBDB-21731] Journal Article
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Spatial and temporal coherence properties of single free-electron laser pulses
Optics express 20(16), 17480 - 17495 (2012) [10.1364/OE.20.017480]  GO
ddc:530
The experimental characterization of the spatial and temporal coherence properties of the free-electron laser in Hamburg (FLASH) at a wavelength of 8.0 nm is presented. Double pinhole diffraction patterns of single femtosecond pulses focused to a size of about 10×10 μm$^2$ were measured. [...]
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