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法拉第磁光光纤电流传感器因其具有结构简单、安全可靠、高精度和灵敏度等优点而受到国内外的广泛关注。法拉第传感材料的磁光性能对于光纤电流传感器的性能有重要的影响。本文用熔盐法生长了高法拉第旋转角、温度稳定的稀土铁石榴石磁光单晶ＢｉＧｄ：ＹＩＧ，测试分析了其在近红外波段的磁光性能及其温度特性。其法拉第旋转角θＦ 为－ ５３４°／ｃｍ （λ＝ １．３１ μｍ ）和－ ４４１°／ｃｍ （λ＝ １．５５ μｍ ），比纯ＹＩＧ晶体高出许多；而且其θＦ 随温度变化较小，在２５０～４００ Ｋ范围内，其温度灵敏度Ｓ为４．２０×１０－ ４ ／Ｋ－ １。用此晶体研制成的磁光光纤电流传感器在实验条件下测得的灵敏度为４ ／ｍ ，准确度为０．３％ 。
Due to its advantages of simple structure, safe and reliable, high precision and sensitivity, Faraday magneto-optical fiber current sensor has attracted wide attention at home and abroad. Magneto-optical properties of Faraday sensing materials have a significant impact on the performance of fiber-optic current sensors. In this paper, the high-Faraday rotation angle and temperature-stabilized rare earth iron garnet magneto-optical single crystal BiGd: YIG was grown by the molten salt method. The magneto-optical properties and temperature characteristics in the near infrared region were tested. The Faraday rotation angles θF are - 534 ° / cm (λ = 1.31 μm) and - 441 ° / cm (λ = 1.55 μm), which are much higher than that of the pure YIG crystal. , In the range of 250-400 K, the temperature sensitivity S is 4.20 × 10 -4 / K -1. The magneto-optical fiber current sensor developed with this crystal has a sensitivity of 4 / m and an accuracy of 0.3% under the experimental conditions.