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Applied Optics

Applied Optics


  • Vol. 35, Iss. 7 — Mar. 1, 1996
  • pp: 1083–1087

Linearity of the Faraday-rotation-type ac magnetic-field sensor with a ferrimagnetic or ferromagnetic rotator film

Hiroshi Mori and Yousuke Asahara  »View Author Affiliations

Applied Optics, Vol. 35, Issue 7, pp. 1083-1087 (1996)

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We analyze the linearity and modulation depth of ac magnetic-field sensors or current sensors, using a ferrimagnetic or ferromagnetic film as the Faraday rotator and employing the detection of only the zeroth-order optical diffraction component from the rotator. It is theoretically shown that for this class of sensor the condition of a constant modulation depth and that of a constant ratio error give an identical series of curves for the relationship between Faraday rotation angle Θ and polarizer/analyzer relative angle Φ. We give some numerical examples to demonstrate the usefulness of the result with reference to a rare-earth iron garnet film as the rotator.

© 1996 Optical Society of America

Original Manuscript: June 12, 1995
Revised Manuscript: October 20, 1995
Published: March 1, 1996

Hiroshi Mori and Yousuke Asahara, "Linearity of the Faraday-rotation-type ac magnetic-field sensor with a ferrimagnetic or ferromagnetic rotator film," Appl. Opt. 35, 1083-1087 (1996)

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