Meridional focusing of X-rays diffracted onto a single crystal with a transversal groove (Bragg-diffraction asymmetric lens)

Hrdý, J.; Hrdá, J.

doi:10.1107/s0909049599016635

Cited by 9 publications

(7 citation statements)

References 4 publications

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“…Sagittal focusing of synchrotron radiation by means of diffraction by a single crystal with a parabolic longitudinal groove on its surface has been presented in earlier studies (Hrdy Â, 1998;Hrdy Â & Siddons, 1999). The focusing effect was demonstrated experimentally.…”

Section: Introductionmentioning

confidence: 94%

First observation of meridional focusing of an X-ray beam using diffraction by a crystal with a transverse groove

Hrdý

Ziegler

Artemiev

et al. 2001

J Synchrotron Radiat

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Section: Introductionmentioning

confidence: 94%

First observation of meridional focusing of an X-ray beam using diffraction by a crystal with a transverse groove

Hrdý

Ziegler

Artemiev

et al. 2001

J Synchrotron Radiat

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“…21,22 Typical values of δ i and δ h are in the order of 10 −3 to 10 −6 . Table 2 shows the values of magnification factors calculated according to Eq.…”

Section: Optimal Asymmetry Anglementioning

confidence: 99%

Calculations and surface quality measurements of high-asymmetry angle x-ray crystal monochromators for advanced x-ray imaging and metrological applications

et al. 2015

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Abstract. We present the numerical optimization and the technological development progress of x-ray optics based on asymmetric germanium crystals. We show the results of several basic calculations of diffraction properties of germanium x-ray crystal monochromators and of an analyzer-based imaging method for various asymmetry factors using an x-ray energy range from 8 to 20 keV. The important parameter of highly asymmetric monochromators as image magnifiers or compressors is the crystal surface quality. We have applied several crystal surface finishing methods, including advanced nanomachining using single-point diamond turning (SPDT), conventional mechanical lapping, chemical polishing, and chemomechanical polishing, and we have evaluated these methods by means of atomic force microscopy, diffractometry, reciprocal space mapping, and others. Our goal is to exclude the chemical etching methods as the final processing technique because it causes surface undulations. The aim is to implement very precise deterministic methods with a control of surface roughness down to 0.1 nm. The smallest roughness (∼0.3 nm), best planarity, and absence of the subsurface damage were observed for the sample which was machined using an SPDT with a feed rate of 1 mm∕min and was consequently polished using a fine polishing 15-min process with a solution containing SiO 2 nanoparticles (20 nm).

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“…1 reduces it. The effect of meridional deviation of the diffracted beam was utilized in the study of meridional focusing on a transversal groove fabricated into a crystal surface (Hrdý & Hrdá , 2000;Hrdý et al, 2001).…”

Section: Asymmetric Crystal Monochromatormentioning

confidence: 99%

Possibility of X-ray pulse compression using an asymmetric or inclined double-crystal monochromator

Hrdý

Oberta

2013

J Synchrotron Radiat

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It is shown theoretically that the asymmetric or inclined double-crystal X-ray monochromator may be used for X-ray pulse compression if the pulse is properly chirped. By adjusting the mutual distance of the two asymmetric or inclined crystals it should be possible to achieve even a sub-femtosecond compression of a chirped free-electron laser pulse. The small d-spacing of the crystal enables a more compact scheme compared with the currently used grating compression scheme. The asymmetric cut of the crystal enables the acceptance of a larger bandwidth. The inclined cut has larger tunability.

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Meridional focusing of X-rays diffracted onto a single crystal with a transversal groove (Bragg-diffraction asymmetric lens)

Cited by 9 publications

References 4 publications

First observation of meridional focusing of an X-ray beam using diffraction by a crystal with a transverse groove

First observation of meridional focusing of an X-ray beam using diffraction by a crystal with a transverse groove

Calculations and surface quality measurements of high-asymmetry angle x-ray crystal monochromators for advanced x-ray imaging and metrological applications

Possibility of X-ray pulse compression using an asymmetric or inclined double-crystal monochromator

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