Through use of magnetostrictive coatings or jackets bonded to single-mode optical fibers deployed in a Mach-Zehnder interferometer, Dandridge et al.1 have shown that magnetic-field measurements in the 10−6-G/m range of fiber can be achieved in the laboratory. The results were in good agreement with the theoretical predictions of Yariv and Winsor2 for nickel-coated silica fibers. This paper reports recent progress in exploring very high magnetostriction metallic glasses for use in single-mode fiber magnetic sensors. These materials have been found to otter substantially greater magnetic sensitivities than results reported to date in the literature and make fiber-optic magnetometers attractive for a variety of applications.

© 1982 Optical Society of America

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