2021
DOI: 10.1088/1681-7575/abef23 View full text |Buy / Rent full text
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Abstract: The measurement of the angle between an interferometer’s front mirror and the diffracting planes is a critical aspect of the measurement of Si lattice parameters by combined x-ray and optical interferometry. In addition to being measured offline by x-ray diffraction, it was checked online by moving the analyser crystal transversely and observing the phase shift of the interference fringe. We describe the measurement procedure and give the miscut angle of the 28Si crystal, whose lattice parameter was an essenti… Show more

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“…The first-order effect of defocus on the phase of the travelling fringes -encoded by the px i phases in the waves (15) leaving the interferometer -and, consequently, on the lattice parameter measurement was investigated analytically and experimentally in [39,40,41].…”
Section: Defocusmentioning
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“…The first-order effect of defocus on the phase of the travelling fringes -encoded by the px i phases in the waves (15) leaving the interferometer -and, consequently, on the lattice parameter measurement was investigated analytically and experimentally in [39,40,41].…”
Section: Defocusmentioning
“…For the experimental verification of the these predictions, we mined useful data from the archive of the lattice parameter measurements carried out in 2010. At that time, to countercheck a previous measurement of the angle between the analyser front mirror and the diffracting planes [24,25], we defocused the interferometer by moving the analyser transversally, in a direction opposite the z axis in Fig. 2, and archived the interferometer signals before and after the displacement.…”
Section: Experimental Testmentioning
“…However, a miscut angle makes the front mirror slightly misaligned and, therefore, the defocus shows a small axial component [25]. For this reason, the only quantity experimentally observable is the difference between the phase sensitivities of the travelling fringes observed in the O and H beams.…”
Section: Experimental Testmentioning