EUV Hartmann sensor for wavefront measurements at the Free-electron LASer in Hamburg

Flöter, Bernhard; Juranić, Pavle; Kapitzki, Svea; Keitel, Barbara; Mann, Klaus; Plönjes, Elke; Schäfer, Bernd; Tiedtke, K.

doi:10.1088/1367-2630/12/8/083015

Cited by 44 publications

(31 citation statements)

References 14 publications

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“…From the measured spot pattern the employed evaluation software [144] computes the wavefront in terms of a linear superposition of the Zernike polynomials. Under the assumption of full coherence, beam parameters such as waist diameter, divergence or astigmatic waist difference are derived [145]. In the following these properties are compared to the results from the precedent caustic scan.…”

Section: Results From Wavefront Measurementmentioning

confidence: 99%

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Radiation characteristics of extreme UV and soft X-ray sources

Mey¹

2015

Göttingen Series in X-Ray Physics

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Section: Results From Wavefront Measurementmentioning

confidence: 99%

“…On the other hand, the evaluation of PMMA imprints can also result in underestimated beam sizes [145]. In any case, the global degree of coherence is strongly dependent on the derived beam diameter, as relations (3.27) and (3.36) reveal.…”

Section: Coherence Properties Of the Flash Beammentioning

confidence: 98%

Radiation characteristics of extreme UV and soft X-ray sources

Mey¹

2015

Göttingen Series in X-Ray Physics

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“…In total, 13 consecutive HH wavefronts were recorded in the same conditions for HHG and compared to estimate the stability of the wavefront. The HH wavefronts were reconstructed using the software MrBeam [24]. Prior to wavefront reconstruction, a dark image was subtracted and hot pixels were removed for each measurement.…”

Section: Wavefront Measurementmentioning

confidence: 99%

“…For direct measurement of the XUV intensity profile, the XUV camera is placed directly after the filters without spectrometer. For wavefront measurement, the XUV camera is replaced by a XUV wavefront sensor with alignment for tip/tilt and the vertical/horizontal axis [24,25] and a 300 nm-thick Al filter without supporting mesh is used. …”

Section: Introductionmentioning

confidence: 99%

Optimization and Characterization of High-Harmonic Generation for Probing Solid Density Plasmas

Koliyadu

Künzel²,

Wodzinski³

et al. 2017

Photonics

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Abstract: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). For demanding imaging applications such as single-shot measurements of solid density plasmas, the HHG probe has to be optimized in photon number and characterized in intensity and wavefront stability from shot-to-shot. In an experiment, a coherent EUV source based on HHG driven by a compact diode-pumped laser is optimized in photons per pulse for argon and xenon, and the shot-to-shot intensity stability and wavefront changes are characterized. The experimental results are compared to an analytical model estimating the HHG yield, showing good agreement. The obtained values are compared to available data for solid density plasmas to confirm the feasibility of HHG as a probe.

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“…Im Rahmen der vorliegenden Arbeit wurden zwei Wellenfrontsensoren für den Einsatz an FLASH aufgebaut und dort sowie an LCLS verwendet. Mit den Sensoren wurden die Strahlpropagationsparameter der Beamlines bestimmt und die Fokussierspiegel justiert [15,16]. Trotz fehlerarmer und gut justierter Optiken kann der Wärmeeintrag in die Spiegel zur Herausbildung transienter Aberrationen der Wellenfront führen.…”

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EUV Hartmann sensor for wavefront measurements at the Free-electron LASer in Hamburg

Cited by 44 publications

References 14 publications

Radiation characteristics of extreme UV and soft X-ray sources

Radiation characteristics of extreme UV and soft X-ray sources

Optimization and Characterization of High-Harmonic Generation for Probing Solid Density Plasmas

Strahlcharakterisierung von Freie-Elektronen-Lasern im weichen Röntgen-Spektralbereich

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