Direct measurement of the x-ray refractive index by Fresnel diffraction at a transparent edge

Gayer, Christoph; Hemmers, D.; Stelzmann, C.; Pretzler, G.

doi:10.1364/ol.38.001563

Cited by 19 publications

(9 citation statements)

References 9 publications

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“…the shapes of the diffraction peaks, was found to be particularly sensitive to the phase shift of the light passing through the sample. This behaviour was also exploited by Gayer et al to measure the real refractive index of K α radiation by measuring the Fresnel diffraction from a knife edge [25].…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

Measurements of free-free absorption in warm dense aluminium

Hyland

White

Kettle

et al. 2021

Plasma Phys. Control. Fusion

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Extreme ultraviolet radiation from a high harmonic source has been used to measure the free-free attenuation coefficient and real refractive index of warm dense aluminium, with sample conditions of near solid density and temperature of 0.9 ± 0.23 eV. These were compared to results from the literature, where the measured attenuation coefficients showed some consistency with the modelling and existing data from a previous experiment. The absolute values of the attenuation coefficient were found to reside between the different sets of models for the warm dense matter (WDM) attenuation coefficient, and were found to be more in line with modelling and measurements of the cold opacity from the literature. Novel measurements of the real refractive index of WDM were also achieved-while ambiguity makes these measurements consistent with all the models, they prove useful as a proof-of-concept for future WDM studies.

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Section: Data Analysis and Resultsmentioning

confidence: 99%

Measurements of free-free absorption in warm dense aluminium

Hyland

White

Kettle

et al. 2021

Plasma Phys. Control. Fusion

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“…Similarly to the spatial case, we can indeed consider the impact of a temporal phase shift imprinted on an initial pulse [23,61,62], on a wave that has an initial chirp [63,64] or a wave that is only partially coherent [3]. With the progress of coherent transmissions, it is also possible to combine intensity and phase modulation, therefore mimicking a partially transparent phase object [22,48,65]. Moreover, it is possible to benefit from the vectorial properties of light in fibers to explore new degrees of freedom and other nonlinear structures [66].…”

Section: Discussionmentioning

confidence: 99%

Temporal Fresnel diffraction induced by phase jumps in linear and nonlinear optical fibres

Sheveleva

Finot

2020

Results in Physics

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“…Finally, we should mention that the researchers have applied the Fresnel diffraction from a phase step to the measurements of the refractive index in X-ray region [23], film thickness [24][25][26], etching rate [27], simultaneous measurement of film thickness and refractive index [26], focal lengths of the lenses [28], specification of the spectral line profile [29], and modulation of phase function [30], Applications are increasing, particularly, in quantitative imaging of the phase objects in different scales [13,[31][32].…”

Section: Measurement Of Diffusion Coefficientmentioning

confidence: 99%

Fresnel Diffraction from Phase Steps and Its Applications

Tavassoly

Salvdari

2020

IJOP

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The well-established Fresnel diffraction occurs as an opaque object partially obstructs the passage of a coherent beam of light. In this process, the amplitude of the optical wave experiences a discontinuous change that leads to peculiar bright and dark fringes near the ray optics border of the beam. The fringe pattern varies very slowly by distance from the object and away from the beam border the diffraction effect is negligible. These behaviors have limited the applications of the conventional Fresnel diffraction very severely. In this article, we introduce a new kind of Fresnel diffraction that occurs due to discontinuous change in phase or phase gradient, in a part of a coherent beam of light. The change splits the beam into two diffracting wavefronts with common border that interfere with each other. In this kind of diffraction, the fringes may appear in the central part of the beam and their locations and visibilities are very sensitive to the phase change. Therefore, the researchers have utilized the effect in the measurements of different physical quantities, with high accuracy, using modest equipment. In this article, we use the Fresnel diffraction from the semi-infinite opaque screen (knife-edge) as the building block to describe the introduced effect, diffraction from the phase steps, and discuss its different aspects. We simulate the implied diffraction patterns, investigate the patterns by experiments, elaborate on the unique features of the effect, and present some interesting applications.

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Direct measurement of the x-ray refractive index by Fresnel diffraction at a transparent edge

Cited by 19 publications

References 9 publications

Measurements of free-free absorption in warm dense aluminium

Measurements of free-free absorption in warm dense aluminium

Temporal Fresnel diffraction induced by phase jumps in linear and nonlinear optical fibres

Fresnel Diffraction from Phase Steps and Its Applications

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