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Faraday effect current sensor with improved sensitivity–bandwidth product

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Abstract

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

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