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Initial tests of a new X‐ray Michelson interferometer
Author(s) -
Sutter John P.,
Kuetgens Ulrich,
Materlik Gerhard,
Rostomyan Armen
Publication year - 2003
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889803020740
Subject(s) - interferometry , michelson interferometer , optics , interferometric visibility , astronomical interferometer , physics , intensity interferometer , optical path length , crystal (programming language) , wavelength , materials science , computer science , programming language
A Michelson interferometer for X‐rays of wavelength ∼1 Å has been proposed to test the temporal coherence of FEL radiation. Such a device has been made at HASYLAB from a silicon single crystal. It is based on the BBB interferometer of Bonse and Hart. One of its mirrors can be pushed by a piezo to introduce the desired beam path difference. For the preliminary tests described in this paper, the crystal was also equipped with an LLL interferometer to check the quality of the crystal and of its preparation. The rotation of a phase‐shifting object (a Plexiglas plate) in one of the LLL's beam paths has been found to produce a fringe pattern which can be shown to yield the phase‐shifting material's index of refraction. The interferometer crystal's front section was held fixed with a compression spring. At the same time, the interferometer was bathed in viscous silicone oil to reduce vibrations.