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Optics Letters

Optics Letters


  • Vol. 19, Iss. 22 — Nov. 15, 1994
  • pp: 1903–1905

Faraday effect current sensor with improved sensitivity–bandwidth product

K. B. Rochford, A. H. Rose, M. N. Deeter, and G. W. Day  »View Author Affiliations

Optics Letters, Vol. 19, Issue 22, pp. 1903-1905 (1994)

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We report a new design for a Faraday effect current sensor based on yttrium iron garnet that has substantially greater bandwidth than previous designs and is much easier to fabricate. The measured sensitivity is 0.7°/A, with a −3-dB bandwidth of 500 MHz, which gives an improvement in sensitivity–bandwidth product of approximately 45. A noise-equivalent current of 840 nA/Hz1/2 was measured at 1.8 kHz by difference-over-sum processing. The use of turning prisms with phase-preserving coatings greatly simplifies construction, improves electrical isolation, and increases sensitivity through proximity effects.

© 1994 Optical Society of America

Original Manuscript: April 29, 1994
Published: November 15, 1994

K. B. Rochford, A. H. Rose, M. N. Deeter, and G. W. Day, "Faraday effect current sensor with improved sensitivity–bandwidth product," Opt. Lett. 19, 1903-1905 (1994)

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  1. A. H. Rose, M. N. Deeter, G. W. Day, Opt. Lett. 18, 1471 (1993). [CrossRef] [PubMed]
  2. A. D. Kersey, F. Bucholtz, A. Dandridge, Int. J. Optoelectron. 3, 323 (1988).
  3. G. W. Day, A. H. Rose, Proc. Soc. Photo-Opt. Instrum. Eng. 985, 138 (1988).
  4. G. W. Day, M. N. Deeter, A. H. Rose, in Advances in Optical Fiber Sensors, B. Culshaw, E. L. Moore, Z. Zhipeng, eds. (Society of Photo-Optical Instrumentation Engineers, Bellingham, Wash., 1992).
  5. See, e.g., Y. N. Ning, B. C. B. Chu, D. A. Jackson, Opt. Lett. 16, 1996 (1991). [CrossRef] [PubMed]
  6. P. G. Kard, Opt. Spectrosc. (USSR) 6, 339 (1959).
  7. E. Spiller, Appl. Opt. 23, 3544 (1984). [CrossRef] [PubMed]
  8. M. N. Deeter, A. H. Rose, G. W. Day, J. Lightwave Technol. 8, 1838 (1990). [CrossRef]
  9. D. Chen, J. A. Brug, R. B. Goldfarb, IEEE Trans. Magn. 27, 3601 (1991). [CrossRef]
  10. M. N. Deeter, A. H. Rose, G. W. Day, S. Samuelson, J. Appl. Phys. 70, 6407 (1991). [CrossRef]
  11. R. L. Patterson, A. H. Rose, D. Tang, G. W. Day, in Proceedings of the 25th Intersociety Energy Conversion Engineering Conference, P. A. Nelson, W. W. Schertz, R. H. Till, eds. (American Institute of Chemical Engineers, New York, 1990), p. 500. [CrossRef]

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