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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 24 — Aug. 20, 2011
  • pp: 4788–4797

Permanent magnets for Faraday rotators inspired by the design of the magic sphere

Gérard Trénec, William Volondat, Orphée Cugat, and Jacques Vigué  »View Author Affiliations

Applied Optics, Vol. 50, Issue 24, pp. 4788-4797 (2011)

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Faraday polarization rotators are commonly used in laser experiments. Most Faraday materials have a nonnegligible absorption, which is a limiting factor for high power laser optical isolators or for intracavity optical diodes. By using a stronger magnetic field and a shorter length of Faraday material, one can obtain the same polarization rotation and a reduced absorption. In this paper, we describe two permanent magnet arrangements that are easy to build and produce magnetic fields up to 1.7 T , substantially more than commonly used. The field homogeneity is largely sufficient for a 30 dB isolation ratio. We finally discuss the prospects for producing even larger fields with permanent magnets.

© 2011 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(230.2240) Optical devices : Faraday effect

ToC Category:
Optical Devices

Original Manuscript: March 23, 2011
Revised Manuscript: June 22, 2011
Manuscript Accepted: June 23, 2011
Published: August 16, 2011

Gérard Trénec, William Volondat, Orphée Cugat, and Jacques Vigué, "Permanent magnets for Faraday rotators inspired by the design of the magic sphere," Appl. Opt. 50, 4788-4797 (2011)

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