The Faraday rotator for magnetic field sensors

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PROBLEM TO BE SOLVED : To provide a Faraday rotator for magnetic field sensors, having a high light detection sensitivity even with use of a light source having a wavelength of 950 nm or less.SOLUTION : A Faraday rotator 12 for magnetic field sensors has a composition comprising a PrO-containing glass. A rare-earth iron garnet crystal cannot transmit light in the visible light range, due to having a large absorption derived from iron ions at 1100 nm or less. On the other hand, since a PrO-containing glass has a high transmittance in the range of 620 to 950 nm, a light source 10 having a wavelength of 950 nm or less is used.SELECTED DRAWING : Figure 1