Journal
COMPTES RENDUS PHYSIQUE
Volume 15, Issue 10, Pages 789-840Publisher
ACAD SCIENCES
DOI: 10.1016/j.crhy.2014.09.007
Keywords
Sagnac; Sagnac effect; X-rays; Optics; Fluorescence; Interferometry
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Georges Sagnac is mostly known for the optical effect in rotating frames that he demonstrated in 1913. His scientific interests were quite diverse: they included photography, optical illusions, X-ray physics, radioactivity, the blue of the sky, anomalous wave propagation, interferometry, strioscopy, and acoustics. An optical theme nonetheless pervaded his entire ceuvre. Within optics, an original theory of the propagation of light motivated most of his investigations, from an ingenious explanation of the Fresnel drag, through the discovery of the Sagnac effect, to his quixotic defense of an alternative to relativity theory. Optical analogies efficiently guided his work in other domains. Optics indeed was his true passion. He saw himself as carrying the torch of the two great masters of French optics, Augustin Fresnel and Hippolyte Fizeau. In this mission he overcame his poor health and labored against the modernist tide, with much success originally and bitter isolation in the end. (C) 2014 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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