Focusing XFEL SASE pulses by rotationally parabolic refractive x-ray lenses

Seiboth, Frank; Schropp, Andreas; Hoppe, Robert; Meier, V.A.; Patommel, Jens; Lee, Hae Ja; Nagler, Bob; Galtier, E.; Arnold, Brice; Zastrau, U.; Hastings, J. B.; Nilsson, Daniel; Uhlén, Fredrik; Vogt, Ulrich; Hertz, Hans M.; Schroer, Christian G.

doi:10.1088/1742-6596/499/1/012004

Cited by 17 publications

(15 citation statements)

References 31 publications

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“…The change of focal length with a change of X-ray energy leads to a broadening of the focal spot profile and an increase in side lobe intensity for wide bandwidths, which is especially relevant for applications at XFELs operating in selfamplified spontaneous emission (SASE) mode (Seiboth et al, 2014). Effects on focusing performance for X-ray bandwidths typical of SASE operation are shown in Fig.…”

Section: Influence Of Chromaticitymentioning

confidence: 99%

“…Calculations assume a constant integral energy for all four investigated bandwidths. Following Seiboth et al (2014), we convolved the monochromatic three-dimensional intensity distribution with the spectral distribution mapped to a change in focal length on the optical axis. This assumes that the wavefront shape is not significantly altered for the mild polychromaticity here, but the focal plane simply shifts along the optical axis while the transverse profile is conserved.…”

Section: Influence Of Chromaticitymentioning

confidence: 99%

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Nanofocusing with aberration-corrected rotationally parabolic refractive X-ray lenses

Seiboth

Wittwer

Scholz

et al. 2018

J Synchrotron Radiat

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Edited by M. Zangrando, IOM-CNR and Elettra-Sincrotrone, ItalyKeywords: refractive X-ray optics; aberration correction; ptychography; phase plate.Nanofocusing with aberration-corrected rotationally parabolic refractive X-ray lenses Wavefront errors of rotationally parabolic refractive X-ray lenses made of beryllium (Be CRLs) have been recovered for various lens sets and X-ray beam configurations. Due to manufacturing via an embossing process, aberrations of individual lenses within the investigated ensemble are very similar. By deriving a mean single-lens deformation for the ensemble, aberrations of any arbitrary lens stack can be predicted from the ensemble with " = 0.034. Using these findings the expected focusing performance of current Be CRLs are modeled for relevant X-ray energies and bandwidths and it is shown that a correction of aberrations can be realised without prior lens characterization but simply based on the derived lens deformation. The performance of aberration-corrected Be CRLs is discussed and the applicability of aberration-correction demonstrated over wide X-ray energy ranges.

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Section: Influence Of Chromaticitymentioning

confidence: 99%

Section: Influence Of Chromaticitymentioning

confidence: 99%

Nanofocusing with aberration-corrected rotationally parabolic refractive X-ray lenses

Seiboth

Wittwer

Scholz

et al. 2018

J Synchrotron Radiat

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“…While combination of CRLs with diffractive optics can be arranged to correct chromatic aberration, the introduction of a diffractive element in the microscope gives rise to a considerable loss of photons. Focal spots in the 100-200 nm range have been achieved with CRLs at 8.2 keV with a $2% bandwidth, 12 which suggests that microscopy with similar resolution is achievable. However, when it comes to focusing, only longitudinal chromatic aberration is important.…”

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confidence: 98%

Correcting lateral chromatic aberrations in non-monochromatic X-ray microscopy

Falch

Detlefs

Michiel

et al. 2016

Applied Physics Letters

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Lateral chromatic aberration in microscopy based on refractive optics may be reduced significantly by adjustments to the illumination scheme. By taking advantage of a broadened bandwidth illumination, the proposed scheme could open for x-ray microscopy with spatial resolution in the range 150–200 nm at millisecond frame rates. The scheme is readily implemented and is achievable using only standard refractive x-ray lenses, which has the advantage of high efficiency. It also maximizes the transmission and removes the spatial filtering effects associated with absorption in x-ray lenses.

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“…The most demanding requirements are radiation resistance while also providing a large aperture to capture the full X-ray beam. So far, mainly mirror systems 9,10 and beryllium compound refractive lenses 11,12 (Be CRLs) are in routine operation at XFELs. Owing to the short X-ray wavelength the fabrication of optics requires the most advanced technologies to achieve the required structure sizes and fulfill the high demands on figure error and surface quality.…”

Section: Introductionmentioning

confidence: 99%

Aberration correction for hard x-ray focusing at the nanoscale

Seiboth

Schropp

Scholz

et al. 2017

Advances in X-Ray/Euv Optics and Components XII

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We developed a corrective phase plate that enables the correction of residual aberration in reflective, diffractive, and refractive X-ray optics. The principle is demonstrated on a stack of beryllium compound refractive lenses with a numerical aperture of 0.49 × 10 −3 at three different synchrotron radiation and x-ray free-electron laser facilities. By introducing this phase plate into the beam path, we were able to correct the spherical aberration of the optical system and improve the Strehl ratio of the optics from 0.29(7) to 0.87(5), creating a diffraction-limited, large aperture, nanofocusing optics that is radiation resistant and very compact.

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Focusing XFEL SASE pulses by rotationally parabolic refractive x-ray lenses

Cited by 17 publications

References 31 publications

Nanofocusing with aberration-corrected rotationally parabolic refractive X-ray lenses

Nanofocusing with aberration-corrected rotationally parabolic refractive X-ray lenses

Correcting lateral chromatic aberrations in non-monochromatic X-ray microscopy

Aberration correction for hard x-ray focusing at the nanoscale

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